Skip to main content
Erschienen in: BMC Psychiatry 1/2019

Open Access 01.12.2019 | Research article

Fetal alcohol spectrum disorder: neurodevelopmentally and behaviorally indistinguishable from other neurodevelopmental disorders

verfasst von: Shannon Lange, Kevin Shield, Jürgen Rehm, Evdokia Anagnostou, Svetlana Popova

Erschienen in: BMC Psychiatry | Ausgabe 1/2019

Abstract

Background

The lack of universally accepted diagnostic criteria and the high rate of psychiatric comorbidity make it difficult to diagnose Fetal Alcohol Spectrum Disorder (FASD). In an effort to improve the diagnosis of FASD, the current study aimed to identify a neurodevelopmental profile that is both sensitive and specific to FASD.

Methods

A secondary analysis was conducted on data obtained from the Canadian component of the World Health Organization International Study on the Prevalence of FASD. Data on neurodevelopmental status and behavior were derived from a battery of standardized tests and the Child Behavior Checklist for 21 children with FASD, 28 children with other neurodevelopmental disorders, and 37 typically developing control children, aged 7 to 11 years. Two latent profile analyses were performed to derive discriminative profiles: i) children with FASD compared with typically developing control children, and ii) children with FASD compared with typically developing control children and children with other neurodevelopmental disorders. The classification function of the resulting profiles was evaluated using the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV). Confidence intervals (CIs) were approximated using 10,000 bootstrapped samples.

Results

The neurodevelopmental profile of FASD tested consisted of impairments in perceptual reasoning, verbal comprehension, visual-motor speed and motor coordination, processing speed (nonverbal information), attention and executive function, visuospatial processing, and language, in combination with rule-breaking behavior and attention problems. When children with FASD were compared with typically developing control children, a 2-class model fit the data best and resulted in a sensitivity of 95.2% (95% CI: 84.2–100.0%), specificity of 89.2% (95% CI: 78.4–97.5%), PPV of 83.3% (95% CI: 66.7–96.2%), and NPV of 97.1% (95% CI: 90.3–100.0%). When children with FASD were compared with typically developing control children and children with other neurodevelopmental disorders, the neurodevelopmental profile correctly identified only 56.9% (95% CI: 45.1–69.2%) of typically developing children and children with other neurodevelopmental disorders as not having FASD, and thus the profile was found not to be specific to children with FASD.

Conclusion

The findings question the uniqueness of children with FASD with respect to their neurodevelopmental impairments and behavioral manifestations.
Hinweise

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Abkürzungen
ADHD
Attention Deficit Hyperactivity Disorder
AIC
Akaike Information Criterion
ARND
Alcohol-Related Neurodevelopmental Disorder
ASD
Autism Spectrum Disorder
BIC
Bayesian Information Criterion
CBCL
Child Behavior Checklist
CI
Confidence interval
DSM-5
Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition
FAS
Fetal Alcohol Syndrome
FASD
Fetal Alcohol Spectrum Disorder
LLV
Log-Likelihood Value
LPA
Latent profile analysis
ND-PAE
Neurobehavioral Disorder Associated with Prenatal Alcohol Exposure
NEPSY-II
NEPSY, Second Edition
NPV
Negative predictive value
OFC
Occipitofrontal circumference
pFAS
Partial Fetal Alcohol Syndrome
PFL
Palpebral fissure length
PPV
Positive predictive value
SD
Standard deviation
WASI-II
Wechsler Abbreviated Scales of Intelligence, Second Edition
WISC-IV
Wechsler Intelligence Scale for Children, Fourth Edition

Background

Exposure to alcohol prenatally is the etiological cause of Fetal Alcohol Spectrum Disorder (FASD) – a term that is used to cover a range of diagnoses, including: Fetal Alcohol Syndrome (FAS), Partial FAS (pFAS), Alcohol-Related Neurodevelopmental Disorder (ARND), and depending on the diagnostic guideline, Alcohol-Related Birth Defects [1, 2]. Although historically used as a non-diagnostic umbrella term, it has recently been proposed that FASD be used as a diagnostic term with the specification of the presence or absence of sentinel facial features [3]. This is in agreement with the newly proposed diagnosis of Neurobehavioral Disorder Associated with Prenatal Alcohol Exposure (ND-PAE) in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) [4]. ND-PAE encompasses a range of neurobehavioral effects associated with prenatal alcohol exposure, and can be diagnosed independent of any physical findings [5].
It is well documented that individuals with FASD exhibit a broad array of neurodevelopmental impairments, such as deficits in adaptive function, attention, executive function, motor function, social cognition, verbal and nonverbal learning, as well as externalizing behaviors [6, 7]. It is also commonly reported that children with FASD have diminished intellectual functioning [8]; however, when compared with IQ-matched control children, differences in their neurodevelopmental presentation have been noted [9]. Although it is widely accepted that the neurodevelopmental and behavioral effects of prenatal alcohol exposure are far-reaching [7], the current diagnostic guidelines tend to focus on the severity of the neurodevelopmental impairments rather than on the specific impairments.
Early and accurate diagnosis of FASD is crucial to providing timely developmental interventions, which are key to altering the developmental trajectory of affected individuals with respect to social functioning, improving their quality of life, and preventing subsequent adverse outcomes common among individuals with FASD, such as school failure and dropping out, addiction, mental health problems, dependent living, as well as involvement with the law and incarceration [10]. However, even in clinical settings where FASD is an important area of emphasis, individuals who have been affected by prenatal alcohol exposure often go undiagnosed or are misdiagnosed [11]. This can likely be attributed to the fact that the diagnosis of FASD is complicated due to difficulties in obtaining confirmation of prenatal alcohol exposure, a high rate of psychiatric comorbidity [12, 13], and the existence of signs and symptoms that overlap with those of other neurodevelopmental disorders [14].
Thus, with the aim of improving screening and diagnostic efforts, the concept of a unique neurodevelopmental profile of FASD, defined as the outward expression (behavioral and developmental) of the central nervous system damage caused by prenatal alcohol exposure, has received some attention in recent years. A distinct neurodevelopmental profile of FASD could assist in accurately identifying individuals with FASD, distinguishing between FASD and other conditions that present similar clinical features, improving clinical services for individuals with FASD, and triaging of individuals most in need of a full multidisciplinary FASD diagnostic assessment. Further, a unique neurodevelopmental profile of FASD could aid in the ascertainment of accurate prevalence estimates, as well as the planning and development of appropriate targeted interventions for individuals with FASD. Therefore, the objective of the current study was to identify a neurodevelopmental profile that is both sensitive and specific to FASD.
As discussed above, FASD includes several distinct diagnoses. As such, there is the possibility that individuals with FASD exhibit more than one neurodevelopmental profile (i.e., a unique profile could exist for each diagnostic category). In order to explore this possibility, the current study utilized a methodology that allows for the empirical determination of the number of distinct profiles.

Methods

Participants

This study was a secondary analysis of data for 37 typically developing children (70.3% male; mean [standard deviation (SD)] age: 9.0 [1.0] years), 21 children with FASD (52.4% male; mean [SD] age: 9.7 [0.8] years), and 28 children with other neurodevelopmental disorders (Attention Deficit Hyperactivity Disorder [ADHD] and/or Autism Spectrum Disorder [ASD]; 75.0% male; mean [SD] age: 9.3 [1.0] years) from the Canadian component of the World Health Organization (WHO) International Study on the Prevalence of FASD [15]. The Canadian FASD prevalence study employed a cross-sectional, observational design using active case ascertainment, along with retrospective collection of prenatal alcohol exposure information, to identify cases of suspected FASD among elementary school students in grades 2, 3, and 4 attending public school in the Greater Toronto Area in Ontario, Canada. The study procedures followed a step-wise approach, where only those students meeting predetermined criteria proceeded to the subsequent phase. Phase I involved: 1) taking growth measurements, 2) identifying learning and/or behavioral problems, and 3) a dysmorphology examination. Phase II involved: 1) a neurodevelopmental assessment, 2) maternal interview, and 3) behavioral observations/ratings by parents, obtained via the Child Behavior Checklist (CBCL) [15]. In addition, a group of typically developing control children was randomly selected from a list of all students who completed Phase I and who did not meet the criteria for Phase II using a systematic sampling technique; these students underwent a complete assessment in Phase II. Final diagnostic screening conclusions were made, by consensus, by a team of experienced multidisciplinary experts, using the 2005 Canadian diagnostic guidelines [1]. A detailed description of the methodology of the Canadian FASD prevalence study is presented in Popova et al. [16].

Measures

Neurodevelopmental assessment

Neurodevelopmental assessments were conducted by qualified psychometrists using the WHO International Study on the Prevalence of FASD test battery, which included: Wechsler Abbreviated Scales of Intelligence, Second Edition (WASI-II [17]; subtests administered included block design, matrix reasoning, similarities, and vocabulary); Wechsler Intelligence Scale for Children, Fourth Edition (WISC-IV [18]; subtests administered included coding, digit span, symbol search, and letter-number sequencing); and NEPSY, Second Edition (NEPSY-II [19]; subtests administered included arrows, auditory attention, fingertip tapping, response set, and word generation). This test battery was devised based on the minimum measurements necessary to screen children for FASD, as per expert opinion. All tests were administered and scored by the examiner according to published test manuals and rechecked by a second examiner. Raw scores were converted to scaled scores according to age and sex norms. Canadian norms were used for the WISC-IV, and US norms were used for the WASI-II and NEPSY-II (as Canadian norms are not available for the respective instruments).

Behavioral observations/ratings by parents

Parents were asked to complete the CBCL to evaluate their child’s social competencies and identify any behavioral problems. The CBCL is a widely used, standardized questionnaire to assess emotional and behavioral problems in children aged 6–18 years [15]. T-scores were computed for 23 composite scales using 113 behavioral descriptors, scored on a three-point Likert scale (0 = not true, 1 = somewhat or sometimes true, 2 = very true or often true), according to age and sex norms.

Latent profile analysis

Analysis 1: children with FASD vs. typically developing control children

Latent profile analysis (LPA) [20] was first performed on a sample of children with FASD and typically developing control children in order to identify the measures that best differentiate the two groups of participants. A step-wise approach was used to select indicator variables for the LPA. A total of 42 variables were available for consideration (22 derived from the subtests of the neurodevelopmental test battery and 20 derived from the composite scales of the CBCL). Variables were initially selected based on standardized differences in means between children with FASD and typically developing control children (measured through Cohen’s d) [21]; variables with a large effect size (d ≥ 0.8) were retained. Pearson’s correlation coefficients (r) were calculated to avoid the inclusion of redundant variables. For strongly correlated variables (r ≤ − 0.7 or r ≥ 0.7), the variable with the larger effect size was retained. If the effect sizes were equal, Student’s unpaired t-tests were performed (to test differences in the means between children with FASD and typically developing control children), and the variable with the larger t-score was retained.
Post-hoc analysis
High levels of prenatal alcohol exposure have been found to be associated with an increased risk of impaired intellectual functioning [8]. In order to determine if children with FASD are distinguishable from typically developing control children by IQ alone, LPA was performed using IQ (i.e., the WISC-IV, FSIQ-4 score) only.

Analysis 2: children with FASD vs. typically developing control children and children with other neurodevelopmental disorders

To determine whether the neurodevelopmental profile identified in analysis 1 is specific to FASD, LPA was performed on the complete sample (i.e., children with FASD, children with other neurodevelopmental disorders, and typically developing children). In addition to the class solution selected based on model fit, as described below, a 4-class model was also explored as there were four diagnostically distinct groups included in the sample (FASD, ADHD, ASD, and typically developing children).
Sensitivity analysis
Given the small number of children with ASD in the group of children with other neurodevelopmental disorders and the shared characteristics of FASD and ASD [22], LPA was performed on a sample of children with FASD (n = 21), children with ADHD (n = 22), and typically developing control children (n = 37) to determine the influence that the inclusion of children with ASD had on the ability of the neurodevelopmental profile to differentiate the respective groups of children.

Model selection

The number of subgroups in the sample was tested iteratively based on the following model fit statistics: Akaike Information Criterion (AIC) [23], Bayesian Information Criterion (BIC) [24], log likelihood, and the Lo-Mendell-Rubin adjusted log likelihood ratio test [25]. Optimal model fit was defined by lower relative AIC and BIC values and higher log likelihood values. Further, an entropy value > 0.8 was used as an indicator of highly discriminating latent classes (i.e., an indicator of low classification uncertainty) [26].

Model evaluation

In LPA, following the determination of the likely number of classes, participants were subsequently assigned to a subgroup based on the probability of membership as indicated by the model. This assignment allows for the model’s classification function, as a binary classification test, to be evaluated. This evaluation was achieved through the calculation of the resulting model’s sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV). The 95% confidence interval (CI) for each measure of interest was approximated using the 2.5th and 97.5th percentiles of 10,000 bootstrap generated estimates. Further, Cohen’s d and unpaired Student’s t-test for normally distributed data were used to compare the resulting subgroups on each of the observed indicator variables.

Missing data imputation

Little’s missing completely at random (MCAR) test [27] was performed to test the assumption that missing data were missing completely at random (X2(3) = 2.575, p = 0.462); this was confirmed. As such, missing data (0.5% of the data were missing) were replaced by the mean score of the complete cases in the study sample (i.e., mean imputation).

Statistical software

Variable selection and the MCAR test were performed using Stata version 15.1 [28], the LPA was conducted using Mplus version 8.0 [29], and CIs were computed in R version 3.4.4 [30]. Statistical significance was based on an acceptable type-I error rate (α) of 0.05.

Results

The three groups of children differed from one another with respect to ethnicity (p = 0.020), height ≤ 10th percentile (p = 0.041), and occipitofrontal circumference ≤ 10th percentile (p = 0.011). With respect to mean IQ, both children with FASD (mean = 87.2 [SD = 10.2]) and children with other neurodevelopmental disorders (mean = 95.6 [SD = 14.1]) differed from typically developing control children (mean = 106.4 [SD = 12.9]; p = < 0.001 and p = 0.003, respectively), but were not significantly different from one another (p = 0.064). The groups did not significantly differ from one another on age, sex, handedness, weight ≤ 10th percentile, or the three characteristic facial features that discriminate individuals with and without FAS or pFAS (i.e., palpebral fissure length 2 standard deviations below the mean, smooth philtrum, and thin vermillion border). Demographic and descriptive data for study participants are presented in Table 1.
Table 1
Demographic and descriptive characteristics of study participants
 
Typically developing control children (n = 37)
Children with FASD (n = 21)
Children with other neuro-developmental disorders (n = 28)
Statistical test
P-valuea
Age (years) – mean (SD)
9.0 (1.0)
9.7 (0.8)
9.3 (1.0)
F = 3.63
0.505
 Range
7.2–11.3
7.9–11.0
7.3–10.7
  
Sex (male) – n (%)
26 (70.3)
11 (52.4)
21 (75.0)
X = 3.03
0.220
Handedness (right) – n (%)
32 (86.5)
17 (81.0)
28 (100.0)
X = 5.29
0.071
Ethnicity – n (%)
   
X = 24.09
0.020
 Caucasian
16 (43.2)
15 (71.4)
13 (46.4)
  
 African Canadian/Caribbean
0 (0.0)
1 (4.8)
4 (14.3)
  
 Eastern European
5 (13.5)
2 (9.5)
0 (0.0)
  
 Western European
11 (29.7)
3 (14.3)
2 (7.1)
  
 Chinese/South East Asian
1 (2.7)
0 (0.0)
5 (17.9)
  
 South Asian/Other
4 (10.8)
0 (0.0)
4 (14.3)
  
IQb – mean (SD)
106.4 (12.9)
87.2 (10.2)
95.6 (14.1)
F = 16.18
< 0.010c,d
 Range
80–138
71–116
63–120
  
Height ≤ 10th percentile – n (%)
1 (2.7)
5 (23.8)
3 (10.7)
X = 6.37
0.041
Weight ≤ 10th percentile – n (%)
6 (16.2)
4 (19.1)
4 (14.3)
X = 0.20
0.905
OFC ≤10th percentile – n (%)
0 (0.0)
5 (23.8)
5 (17.9)
X = 8.96
0.011
Right PFL 2SD below the mean – n (%)
8 (21.6)
10 (47.6)
11 (39.3)
X = 4.63
0.099
Left PFL 2SD below the mean – n (%)
9 (24.3)
9 (42.9)
9 (32.1)
X = 2.15
0.342
Smooth philtrum (4 or 5 on the Lip-Philtrum Guide) – n (%)
12 (32.4)
5 (23.8)
9 (32.1)
X = 4.78
0.572
Thin vermillion border (4 or 5 on the Lip-Philtrum Guide) – n (%)
8 (22.2)
4 (19.1)
3 (10.7)
X = 3.77
0.708
FASD diagnostic categorye – n (%)
 FAS
 
3 (14.3)
   
 pFAS
 
2 (9.5)
   
 ARND
 
16 (76.2)
   
Other neurodevelopmental disordersf – n (%)
 ADHD
 
5 (23.8)
23 (82.1)
  
 ASD
 
3 (14.3)
6 (21.4)
  
ADHD Attention Deficit Hyperactivity Disorder, ARND Alcohol-Related Neurodevelopmental Disorder, ASD Autism Spectrum Disorder, FAS Fetal Alcohol Syndrome, FASD Fetal Alcohol Spectrum Disorder, OFC Occipitofrontal Circumference, pFAS Partial Fetal Alcohol Syndrome, PFL Palpebral Fissure Length, SD Standard Deviation
ap-values are based on chi-square (for categorical variables) and Student’s unpaired t-test (for continuous variables). bWISC-IV: FSIQ-4. cChildren with FASD vs. Typically developing control children. dChildren with other neurodevelopmental disorders vs. Typically developing control children. eAs per the 2005 Canadian diagnostic guidelines [1]. fNot mutually exclusive

Analysis 1: children with FASD vs. typically developing control children

Based on the variable selection process, described above, ten observed indicator variables were retained. Eight variables were derived from the neurodevelopmental test battery (WASI-II - block design, similarities, and vocabulary; WISC-IV - coding and symbol search; and NEPSY-II - response set, arrows, and word generation (letters)), and two variables were derived from the CBCL (attention problems and rule breaking behavior). Based on the model fit statistics, a 2-class model best fit the data (see Table 2 for the model fit statistics).
Table 2
Model fit statistics for analysis 1 and 2
Model fit statistics
Analysis 1
Analysis 2
Children with FASD vs. Typically developing control children
Post-hoc analysisb: Children with FASD vs. Typically developing control children
Children with FASD vs. Typically developing control children and children with other neurodevelopmental disorders
Sensitivity analysis: Children with FASD vs. Typically developing control children and children with ADHD
1-class
2-class
3-class
1-class
2-class
1-class
2-class
3-class
4-class
1-class
2-class
3-class
AIC
3275.21
3159.45
3144.57
482.44
483.83
4850.13
4693.50
4665.17
4635.78
4504.74
4358.25
4335.97
BIC
3316.42
3223.33
3231.11
486.56
492.07
4899.22
4769.58
4768.25
4765.86
4552.38
4432.09
4436.02
LLV
− 1617.60
− 1548.73
− 1530.29
− 239.22
− 237.91
− 2405.07
− 2315.75
− 2290.58
− 2264.89
− 2232.37
− 2148.13
− 2125.99
p-valuea
0.149
0.512
0.190
0.002
0.265
0.422
0.008
0.391
Entropy
0.903
0.956
0.682
0.894
0.924
0.924
0.894
0.926
AIC Akaike information criterion, BIC Bayesian information criterion, LLV Log-likelihood value, “-” Not applicable
ap-value is in reference to the respective model’s comparison with the lower class solution
bModel with only IQ as an indicator variable
In this model, 24 participants (41.4% of the sample) were assigned to subgroup 1, and 34 participants (58.6% of the sample) were assigned to subgroup 2. Participants in subgroup 1 performed worse than participants in subgroup 2 for each of the above eight observed variables derived from the subtests of the neurodevelopmental test battery and scored higher on the above two observed variables derived from the composite scales of the CBCL (Table 3).
Table 3
Mean scores for each subgroup in the 2-class models in analysis 1 and 2
Observed variable/measure
Analysis 1
FASD vs. Typically developing control children
Analysis 2
FASD vs. Typically developing control children and children with other neurodevelopmental disorders
Subgroup 1a
Subgroup 2a
d
t-score
p-value
Subgroup 1b
Subgroup 2b
d
t-score
p-value
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Neurodevelopmental Test Battery
 WASI-II: block design
8.79
2.62
12.32
3.88
1.03
4.135
< 0.001
9.17
2.79
12.63
3.71
1.07
4.785
< 0.001
 WASI-II: similarities
7.79
2.57
10.47
3.22
0.99
3.863
< 0.001
8.08
2.35
10.63
3.09
0.94
4.212
< 0.001
 WASI-II: vocabulary
7.96
3.18
12.00
3.70
1.16
4.450
< 0.001
8.27
3.01
12.11
3.55
1.18
5.311
< 0.001
 WISC-IV: coding
5.63
3.44
10.15
2.35
1.59
5.590
< 0.001
5.75
3.08
10.58
2.15
1.78
8.549
< 0.001
 WISC-IV: symbol search
6.79
2.47
11.59
2.58
1.89
7.152
< 0.001
7.08
2.41
11.68
2.64
1.83
8.331
< 0.001
 NEPSY-II: arrows
7.25
3.23
11.59
2.45
1.55
5.544
< 0.001
7.75
3.31
11.87
2.03
1.46
7.098
< 0.001
 NEPSY-II: response set
7.13
3.48
11.82
2.79
1.52
5.485
< 0.001
7.91
3.29
12.03
2.87
1.32
6.191
< 0.001
 NEPSY-II: word generation (letter)
8.08
3.23
10.37
2.63
0.79
2.861
0.006
8.29
2.94
10.72
2.52
0.88
4.127
< 0.001
Child Behavior Checklist
 Attention problems
60.73
8.08
51.53
2.30
1.68
5.421
< 0.001
62.38
8.22
53.13
5.16
1.32
6.374
< 0.001
 Rule breaking behavior
56.08
6.67
51.88
2.96
0.87
2.885
0.007
56.50
7.19
52.76
4.03
0.62
3.042
0.003
d Cohen’s d, SD Standard deviation
aSubgroup 1 is comprised of 20 children with FASD and four typically developing control children; and Subgroup 2 is comprised of one child with FASD and 33 typically developing control children
bSubgroup 1 is comprised of 20 children with FASD, 22 children with other neurodevelopmental disorders, and six typically developing control children; and Subgroup 2 is comprised of one child with FASD, six children with other neurodevelopmental disorders, and 31 typically developing control children
The final 2-class model resulted in 91.4% of participants being classified correctly overall, with almost all (20 out of 21; 95.2% [sensitivity], 95% CI: 84.2–100.0%) children with FASD assigned to subgroup 1, and notably more (33 out of 37; 89.2% [specificity], 95% CI: 78.4–97.5%) typically developing control children assigned to subgroup 2 (Table 4).
Table 4
Number of participants assigned to each subgroup and the classification function of the 2-class model in analysis 1
Group assignment; Classification functiona (%)
Children with FASD (n)
Typically developing control children (n)
Subgroup 1
20
4
Subgroup 2
1
33
Sensitivity (%)
95.2 (95% CI: 84.2–100.0)
Specificity (%)
89.2 (95% CI: 78.4–97.5)
PPV (%)
83.3 (95% CI: 66.7–96.2)
NPV (%)
97.1 (95% CI: 90.3–100.0)
CI Confidence Interval, FASD Fetal Alcohol Spectrum Disorder, n/a Not Applicable, NPV Negative Predictive Value, PPV Positive Predictive Value
aAssuming subgroup 1 is reflective of the neurodevelopmental profile of FASD and subgroup 2 is reflective of typically developing control children
Post-hoc analysis: latent profile analysis based on IQ only
When IQ was included as the only indicator variable, a 1-class model fit better than a 2-class model (Table 2). As such, the respective model was not explored further. Although the mean IQs for children with FASD and for typically developing control children were found to be significantly different (87.2 [SD = 10.2] vs. 106.4 [SD = 12.9], respectively; p < 0.001), the post-hoc analysis demonstrated that these two groups of children could not be differentiated based on IQ only.

Analysis 2: children with FASD vs. typically developing control children and children with other neurodevelopmental disorders

A 2-class model best described the overall sample (Table 2), and correctly identified 83.8% (31 out of 37 [specificity]; 95% CI: 71.0–94.3%) of typically developing children as not having either FASD or other neurodevelopmental disorders (Table 5). However, the 2-class model was only able to correctly identify 56.9% (37 out of 65 [specificity]; 95% CI: 45.1–69.2%) of children with other neurodevelopmental disorders and typically developing children as not having FASD. The 2-class model resulted in almost all children with FASD (20 out of 21) and considerably more children with other neurodevelopmental disorders (22 out of 28) being assigned to subgroup 1, and significantly more typically developing children (31 out of 37) being assigned to subgroup 2 (Table 5). As would be expected, participants in subgroup 1 performed worse than participants in subgroup 2 for each of the eight observed variables derived from the neurodevelopmental subtests and scored higher on the two observed variables derived from the CBCL (Table 3 and Fig. 1).
Table 5
Number of participants assigned to each subgroup and the classification function of the 2- and 4-class models in analysis 2, and the 2-class model in the sensitivity analysis
Group assignment; Classification function (%)
Main Analysis
Sensitivity Analysis
2-class model
4-class model
2-class model
Children with FASD (n)
Children with other neuro developmental disorders (n)
Typically developing control children (n)
Children with FASD (n)
Children with other neuro developmental disorders (n)
Typically developing control children (n)
Children with FASD (n)
Children with ADHD (n)
Typically developing control children (n)
Subgroup 1
20
22
6
13
15
6
20
16
6
Subgroup 2
1
6
31
5
4
0
1
6
31
Subgroup 3
0
5
31
Subgroup 4
3
4
0
Children with FASD vs. Typically developing control children and children with other neurodevelopmental disordersa
 Sensitivity (95% CI)
95.2 (82.6–100.0)b
100.0 (n/a)c
95.2 (84.6–100.0)d
 Specificity (95% CI)
56.9 (45.1–69.2)b
55.4 (43.5–67.2)c
62.7 (50.0–74.6)d
 PPV (95% CI)
41.7 (28.2–55.3)b
42.0 (29.0–56.0)c
47.6 (32.0–62.5)d
 NPV (95% CI)
97.4 (91.4–100.0)b
100.0 (n/a)c
97.4 (91.4–100.0)d
Children with FASD and children with other neurodevelopmental disordersa vs. Typically developing control children
 Sensitivity (95% CI)
85.7 (73.5–95.5)e
89.8 (81.1–97.7)f
83.7 (72.1–94.1)g
 Specificity (95% CI)
83.8 (71.0–94.3)e
83.8 (71.4–94.7)f
83.8 (71.0–94.7)g
 PPV (95% CI)
87.5 (78.2–95.7)e
86.1 (75.0–97.1)f
85.7 (74.3–95.3)g
 NPV (95% CI)
81.6 (68.4–94.6)e
88.0 (79.1–95.9)f
81.6 (68.6–93.1)g
ADHD Attention deficit hyperactivity disorder, CI Confidence interval, FASD Fetal alcohol spectrum disorder, n/a Not applicable, NPV Negative predictive value, PPV Positive predictive value
aSensitivity analysis excludes children with Autism Spectrum Disorder from the group of children with other neurodevelopmental disorders
bAssuming subgroup 1 is reflective of the neurodevelopmental profile of FASD and subgroup 2 is reflective of typically developing control children and children with other neurodevelopmental disorders
cAssuming subgroup 1, 2 and 4 are reflective of the neurodevelopmental profile of FASD and subgroup 3 is reflective of typically developing control children and children with other neurodevelopmental disorders
dAssuming subgroup 1 is reflective of the neurodevelopmental profile of FASD and subgroup 2 is reflective of typically developing control children and children with ADHD
eAssuming subgroup 1 is reflective of the neurodevelopmental profile of FASD and children with other neurodevelopmental disorders and subgroup 2 is reflective of typically developing control children
fAssuming subgroup 1,2 and 4 are reflective of the neurodevelopmental profile of FASD and children with other neurodevelopmental disorders and subgroup 2 is reflective of typically developing control children
gAssuming subgroup 1 is reflective of the neurodevelopmental profile of FASD and children with ADHD and subgroup 2 is reflective of typically developing control children
The 4-class model resulted in all 21 children with FASD and most children with other neurodevelopmental disorders (23 out of 28) being assigned to subgroup 1, 2, or 4, and the majority of typically developing children (31 out of 37) being assigned to subgroup 3. However, the 4-class model did not produce subgroups that were reflective of the diagnostic constructs represented in the sample (see Fig. 1); the model correctly identified only 55.4% (36 out of 65 [specificity]; 95% CI: 43.5–67.2%) of children with other neurodevelopmental disorders and typically developing children as not having FASD.
Sensitivity analysis
A 2-class model best fit the data (Table 2). However, the 2-class model was only able to correctly identify 62.7% (37 out of 59 [specificity]; 95% CI: 50.0–74.6%) of children with ADHD and typically developing children as not having FASD (Table 5). Thus, although children with FASD performed most similarly to children with ASD on the neurodevelopmental subtest included in the profile (Fig. 1), including a small number of children with ASD did not appear to negatively influence the ability of the neurodevelopmental profile to differentiate children with FASD from children with other neurodevelopmental disorders.

Discussion

Although the neurodevelopmental profile identified was sensitive to FASD, it was not specific to FASD, suggesting that a neurodevelopmental profile that can differentiate children with FASD from children with other neurodevelopmental disorders may not exist. However, the findings are limited by the measures used in the analyses, as the inclusion of additional measures may have resulted in a more specific FASD neurodevelopmental profile. Also, data on the use of psychotropic medications were not available. Given that such medications are intended to alter brain function, their use could have impacted the results of the current study. Despite the relatively small sample size, albeit sufficient [31], the latent profile analyses did produce statistically and clinically significant results. Given the few cases of ASD, it was not possible to provide classification results for ASD specifically. Even though the 4-class model did result in children with neurodevelopmental disorders (including FASD) being broken down into subgroups, they were not grouped according to their diagnostic categories. It should be acknowledged that it is possible that the subgroupings could have been an artifact of the methodology used, as the primary goal of LPA is to maximize the homogeneity within subgroups and the heterogeneity between them.
The findings of the current study are in line with those of Mattson and colleagues [32], who were able to demonstrate that a set of neurodevelopmental tests measuring executive function, attention, and visual and spatial memory could differentiate between individuals with FASD and individuals not exposed to alcohol prenatally; however, when using a clinical comparative group, the profile was more accurate at identifying individuals with ADHD than individuals with FASD. Unlike previous studies seeking to identify a unique neurodevelopmental profile of FASD, the current study used a population-based sample of children with FASD – the sample was drawn from a cross-sectional, population-based study that utilized active case ascertainment (the gold standard [33]) to identify cases of FASD. This is also the first study to analyze and incorporate both behavioral observations/ratings of parents and performance-based measures of neurodevelopment when seeking to identify a neurodevelopmental profile of FASD.
Although prenatal alcohol exposure is a necessary cause of FASD, the genetic etiology of FASD remains unknown. Advances in the understanding of genetics and its role in neurodevelopmental disorder risk have created a paradigm shift, such that neurodevelopmental disorders are no longer viewed as having a psychogenic etiology but rather a genetic etiology (see for example, Glessner et al. [34]). Prenatal alcohol exposure leads to epigenetic changes (i.e., altered gene expression) [35]. These changes may contribute to the spectrum of effects and different phenotypes observed in children with FASD [35]. The discovery of reliable genetic and epigenetic markers for FASD would have significant implications for its diagnosis. Such investigations should not be restricted to FASD, but rather include all neurodevelopmental disorders, as this may lead to current categorical classifications of neurodevelopmental disorders being redefined to be more reflective of biologically homogeneous groups [36]. Accordingly, future studies should explore whether neurodevelopmental data combined with genetic and epigenetic data would produce a profile able to diagnose and differentiate FASD from other neurodevelopmental disorders.

Acknowledgements

Not applicable.
The current study was approved by the Research Ethics Board at the Centre for Addiction and Mental Health (Protocol #116/2016).
Not applicable. The current study utilized secondary, de-identified, anonymized data.

Competing interests

The authors declare that they have no competing interests.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://​creativecommons.​org/​licenses/​by/​4.​0/​), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://​creativecommons.​org/​publicdomain/​zero/​1.​0/​) applies to the data made available in this article, unless otherwise stated.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Literatur
1.
Zurück zum Zitat Chudley AE, Conry J, Cook JL, Loock C, Rosales T. N. L: Fetal alcohol spectrum disorder: Canadian guidelines for diagnosis. Can Med Assoc J. 2005;172(5 suppl):S1–S21.CrossRef Chudley AE, Conry J, Cook JL, Loock C, Rosales T. N. L: Fetal alcohol spectrum disorder: Canadian guidelines for diagnosis. Can Med Assoc J. 2005;172(5 suppl):S1–S21.CrossRef
2.
Zurück zum Zitat Hoyme HE, Kalberg WO, Elliott AJ, Blankenship J, Buckley D, Marais A-S, Manning MA, Robinson LK, Adam MP, Abdul-Rahman O, et al. Updated clinical guidelines for diagnosing fetal alcohol spectrum disorders. Pediatrics. 2016;138(2):e20154256.CrossRef Hoyme HE, Kalberg WO, Elliott AJ, Blankenship J, Buckley D, Marais A-S, Manning MA, Robinson LK, Adam MP, Abdul-Rahman O, et al. Updated clinical guidelines for diagnosing fetal alcohol spectrum disorders. Pediatrics. 2016;138(2):e20154256.CrossRef
3.
Zurück zum Zitat Cook JL, Green CR, Lilley CM, Anderson SM, Baldwin ME, Chudley AE, Conry JL, LeBlanc N, Loock CA, Lutke J, et al. Fetal alcohol spectrum disorder: a guideline for diagnosis across the lifespan. CMAJ. 2016;188(3):191–7.CrossRef Cook JL, Green CR, Lilley CM, Anderson SM, Baldwin ME, Chudley AE, Conry JL, LeBlanc N, Loock CA, Lutke J, et al. Fetal alcohol spectrum disorder: a guideline for diagnosis across the lifespan. CMAJ. 2016;188(3):191–7.CrossRef
4.
Zurück zum Zitat American Psychiatric Association. Diagnostic and statistical manual of mental disorders, 5th edition (DSM-5). Arlington: American Psychiatric Association; 2013.CrossRef American Psychiatric Association. Diagnostic and statistical manual of mental disorders, 5th edition (DSM-5). Arlington: American Psychiatric Association; 2013.CrossRef
5.
Zurück zum Zitat Kable JA, O'Connor MJ, Olson HC, Paley B, Mattson SN, Anderson SM, Riley EP. Neurobehavioral disorder associated with prenatal alcohol exposure (ND-PAE): proposed DSM-5 diagnosis. Child Psychiatry Hum Dev. 2016;47(2):335–46.CrossRef Kable JA, O'Connor MJ, Olson HC, Paley B, Mattson SN, Anderson SM, Riley EP. Neurobehavioral disorder associated with prenatal alcohol exposure (ND-PAE): proposed DSM-5 diagnosis. Child Psychiatry Hum Dev. 2016;47(2):335–46.CrossRef
6.
Zurück zum Zitat Kodituwakku PW. Neurocognitive profile in children with fetal alcohol spectrum disorders. Dev Disabil Res Rev. 2009;15(3):218–24.CrossRef Kodituwakku PW. Neurocognitive profile in children with fetal alcohol spectrum disorders. Dev Disabil Res Rev. 2009;15(3):218–24.CrossRef
7.
Zurück zum Zitat Mattson SN, Crocker N, Nguyen TT. Fetal alcohol spectrum disorders: neuropsychological and behavioral features. Neuropsychol Rev. 2011;21(2):81–101.CrossRef Mattson SN, Crocker N, Nguyen TT. Fetal alcohol spectrum disorders: neuropsychological and behavioral features. Neuropsychol Rev. 2011;21(2):81–101.CrossRef
8.
Zurück zum Zitat Mattson SN, Riley EP, Gramling L, Delis DC, Jones KL. Heavy prenatal alcohol exposure with or without physical features of fetal alcohol syndrome leads to IQ deficits. J Pediatr. 1997;131(5):718–21.CrossRef Mattson SN, Riley EP, Gramling L, Delis DC, Jones KL. Heavy prenatal alcohol exposure with or without physical features of fetal alcohol syndrome leads to IQ deficits. J Pediatr. 1997;131(5):718–21.CrossRef
9.
Zurück zum Zitat Vaurio L, Riley EP, Mattson SN. Neuropsychological comparison of children with heavy prenatal alcohol exposure and an IQ-matched comparison group. J Int Neuropsychol Soc. 2011;17(3):463–73.CrossRef Vaurio L, Riley EP, Mattson SN. Neuropsychological comparison of children with heavy prenatal alcohol exposure and an IQ-matched comparison group. J Int Neuropsychol Soc. 2011;17(3):463–73.CrossRef
10.
Zurück zum Zitat Streissguth A, Barr H, Kogan J, Bookstein FL. Understanding the occurrence of secondary disabilities in clients with fetal alcohol syndrome (FAS) and fetal alcohol effects (FAE). In: Final report edn. Seattle: University of Washington, School of Medicine; 1996. Streissguth A, Barr H, Kogan J, Bookstein FL. Understanding the occurrence of secondary disabilities in clients with fetal alcohol syndrome (FAS) and fetal alcohol effects (FAE). In: Final report edn. Seattle: University of Washington, School of Medicine; 1996.
11.
Zurück zum Zitat Chasnoff IJ, Wells AM, King L. Misdiagnosis and missed diagnoses in foster and adopted children with prenatal alcohol exposure. Pediatrics. 2015;135(2):264–70.CrossRef Chasnoff IJ, Wells AM, King L. Misdiagnosis and missed diagnoses in foster and adopted children with prenatal alcohol exposure. Pediatrics. 2015;135(2):264–70.CrossRef
12.
Zurück zum Zitat Lange S, Rehm J, Anagnostou E, Popova S. Prevalence of externalizing disorders and autism Spectrum disorders among children with fetal alcohol spectrum disorder: systematic review and meta-analysis. Biochem Cell Biol. 2018;96(2):241–51.CrossRef Lange S, Rehm J, Anagnostou E, Popova S. Prevalence of externalizing disorders and autism Spectrum disorders among children with fetal alcohol spectrum disorder: systematic review and meta-analysis. Biochem Cell Biol. 2018;96(2):241–51.CrossRef
13.
Zurück zum Zitat Popova S, Lange S, Shield K, Mihic A, Chudley AE, Mukherjee RAS, Bekmuradov D, Rehm J. Comorbidity of fetal alcohol spectrum disorder: a systematic review and meta-analysis. Lancet. 2016;387(10022):978–87.CrossRef Popova S, Lange S, Shield K, Mihic A, Chudley AE, Mukherjee RAS, Bekmuradov D, Rehm J. Comorbidity of fetal alcohol spectrum disorder: a systematic review and meta-analysis. Lancet. 2016;387(10022):978–87.CrossRef
14.
Zurück zum Zitat McLennan JD. Misattributions and potential consequences: the case of child mental health problems and fetal alcohol spectrum disorders. Can J Psychiatr. 2015;60(12):587–90.CrossRef McLennan JD. Misattributions and potential consequences: the case of child mental health problems and fetal alcohol spectrum disorders. Can J Psychiatr. 2015;60(12):587–90.CrossRef
15.
Zurück zum Zitat Achenbach T, Rescorla L. Manual for the ASEBA school-age forms and profiles. Burlington: University of Vermont, Research Center for Children Youth & Families; 2001. Achenbach T, Rescorla L. Manual for the ASEBA school-age forms and profiles. Burlington: University of Vermont, Research Center for Children Youth & Families; 2001.
16.
Zurück zum Zitat Popova S, Lange S, Poznyak V, Chudley A, Shield KD, Reynolds JN, Murray M, Rehm J. Population-based prevalence of fetal alcohol spectrum disorder in Canada. BMC Public Health. 2019;19(1):845. Popova S, Lange S, Poznyak V, Chudley A, Shield KD, Reynolds JN, Murray M, Rehm J. Population-based prevalence of fetal alcohol spectrum disorder in Canada. BMC Public Health. 2019;19(1):845.
17.
Zurück zum Zitat Wechsler D. Wechsler abbreviated scale of intelligence–second edition (WASI-II). San Antonio: PsychCorp; 2011. Wechsler D. Wechsler abbreviated scale of intelligence–second edition (WASI-II). San Antonio: PsychCorp; 2011.
18.
Zurück zum Zitat Wechsler D. Wechsler intelligence scale for children–fourth edition (WISC-IV). San Antonio: PsychCorp; 2008. Wechsler D. Wechsler intelligence scale for children–fourth edition (WISC-IV). San Antonio: PsychCorp; 2008.
19.
Zurück zum Zitat Korkman M, Kirk U, Kemp S. NEPSY-II: a developmental neuropsychological assessment. San Antonio: PsychCorp; 2007. Korkman M, Kirk U, Kemp S. NEPSY-II: a developmental neuropsychological assessment. San Antonio: PsychCorp; 2007.
20.
Zurück zum Zitat Loehlin JC. Latent variable models, 3rd edition. Mahwah: Lawrence Erlbaum; 1998. Loehlin JC. Latent variable models, 3rd edition. Mahwah: Lawrence Erlbaum; 1998.
21.
Zurück zum Zitat Cohen J. Statistical power analysis for the behavioral sciences, 2nd edition. Hillsdale: Lawrence Earlbaum Associates; 1988. Cohen J. Statistical power analysis for the behavioral sciences, 2nd edition. Hillsdale: Lawrence Earlbaum Associates; 1988.
22.
Zurück zum Zitat Stevens SA, Nash K, Koren G, Rovet J. Autism characteristics in children with fetal alcohol spectrum disorders. Child Neuropsychol. 2013;19(6):579–87.CrossRef Stevens SA, Nash K, Koren G, Rovet J. Autism characteristics in children with fetal alcohol spectrum disorders. Child Neuropsychol. 2013;19(6):579–87.CrossRef
23.
Zurück zum Zitat Akaike H. A new look at the statistical model identification. IEEE Trans Autom Control. 1974;19:716–23.CrossRef Akaike H. A new look at the statistical model identification. IEEE Trans Autom Control. 1974;19:716–23.CrossRef
24.
Zurück zum Zitat Sclove S. Application of model-selection criteria to some problems in multivariate analysis. Psychometrika. 1987;52(3):333–43.CrossRef Sclove S. Application of model-selection criteria to some problems in multivariate analysis. Psychometrika. 1987;52(3):333–43.CrossRef
25.
Zurück zum Zitat Lo Y, Mendell N, Rubin D. Testing the number of components in a normal mixture. Biometrika. 2001;88:767–78.CrossRef Lo Y, Mendell N, Rubin D. Testing the number of components in a normal mixture. Biometrika. 2001;88:767–78.CrossRef
26.
Zurück zum Zitat Celeux G, Soromenho G. An entropy criterion for assessing the number of clusters in a mixture model. J Classif. 1996;13:195–212.CrossRef Celeux G, Soromenho G. An entropy criterion for assessing the number of clusters in a mixture model. J Classif. 1996;13:195–212.CrossRef
27.
Zurück zum Zitat Little R. A test of missing completely at random for multivariate data with missing values. J Am Stat Assoc. 1988;83:1198–202.CrossRef Little R. A test of missing completely at random for multivariate data with missing values. J Am Stat Assoc. 1988;83:1198–202.CrossRef
28.
Zurück zum Zitat Stata Corporation. Statistical software: release 15. College Station: Stata Corporation; 2017. Stata Corporation. Statistical software: release 15. College Station: Stata Corporation; 2017.
29.
Zurück zum Zitat Muthén L, Muthén B. Mplus user’s guide. 8th ed. Los Angeles: Muthén & Muthén; 2017. Muthén L, Muthén B. Mplus user’s guide. 8th ed. Los Angeles: Muthén & Muthén; 2017.
30.
Zurück zum Zitat R Core Team. R: a language and environment for statistical computing. Vienna: R Foundation for Statistical Computing; 2016. R Core Team. R: a language and environment for statistical computing. Vienna: R Foundation for Statistical Computing; 2016.
31.
Zurück zum Zitat Wurpts IC, Geiser C. Is adding more indicators to a latent class analysis beneficial or detrimental? Results of a Monte-Carlo study. Front Psychol. 2014;5:920.CrossRef Wurpts IC, Geiser C. Is adding more indicators to a latent class analysis beneficial or detrimental? Results of a Monte-Carlo study. Front Psychol. 2014;5:920.CrossRef
32.
Zurück zum Zitat Mattson SN, Roesch SC, Glass L, Deweese BN, Coles CD, Kable JA, May PA, Kalberg WO, Sowell ER, Adnams CM, et al. Further development of a neurobehavioral profile of fetal alcohol spectrum disorders. Alcohol Clin Exp Res. 2013;37(3):517–28.CrossRef Mattson SN, Roesch SC, Glass L, Deweese BN, Coles CD, Kable JA, May PA, Kalberg WO, Sowell ER, Adnams CM, et al. Further development of a neurobehavioral profile of fetal alcohol spectrum disorders. Alcohol Clin Exp Res. 2013;37(3):517–28.CrossRef
33.
Zurück zum Zitat May PA, Gossage JP. Estimating the prevalence of fetal alcohol syndrome. A summary. Alcohol Res Health. 2001;25(3):159–67.PubMedPubMedCentral May PA, Gossage JP. Estimating the prevalence of fetal alcohol syndrome. A summary. Alcohol Res Health. 2001;25(3):159–67.PubMedPubMedCentral
34.
Zurück zum Zitat Glessner JT, Li J, Wang D, March M, Lima L, Desai A, Hadley D, Kao C, Gur RE, Cohen N, et al. Copy number variation meta-analysis reveals a novel duplication at 9p24 associated with multiple neurodevelopmental disorders. Genome Med. 2017;9(1):106.CrossRef Glessner JT, Li J, Wang D, March M, Lima L, Desai A, Hadley D, Kao C, Gur RE, Cohen N, et al. Copy number variation meta-analysis reveals a novel duplication at 9p24 associated with multiple neurodevelopmental disorders. Genome Med. 2017;9(1):106.CrossRef
35.
Zurück zum Zitat Liyanage VR, Curtis K, Zachariah RM, Chudley AE, Rastegar M. Overview of the genetic basis and epigenetic mechanisms that contribute to FASD pathobiology. Curr Top Med Chem. 2017;17(7):808–28.CrossRef Liyanage VR, Curtis K, Zachariah RM, Chudley AE, Rastegar M. Overview of the genetic basis and epigenetic mechanisms that contribute to FASD pathobiology. Curr Top Med Chem. 2017;17(7):808–28.CrossRef
36.
Zurück zum Zitat Insel T, Cuthbert B, Garvey M, Heinssen R, Pine DS, Quinn K, Sanislow C, Wang P. Research domain criteria (RDoC): toward a new classification framework for research on mental disorders. Am J Psychiatry. 2010;167(7):748–51.CrossRef Insel T, Cuthbert B, Garvey M, Heinssen R, Pine DS, Quinn K, Sanislow C, Wang P. Research domain criteria (RDoC): toward a new classification framework for research on mental disorders. Am J Psychiatry. 2010;167(7):748–51.CrossRef
Metadaten
Titel
Fetal alcohol spectrum disorder: neurodevelopmentally and behaviorally indistinguishable from other neurodevelopmental disorders
verfasst von
Shannon Lange
Kevin Shield
Jürgen Rehm
Evdokia Anagnostou
Svetlana Popova
Publikationsdatum
01.12.2019
Verlag
BioMed Central
Erschienen in
BMC Psychiatry / Ausgabe 1/2019
Elektronische ISSN: 1471-244X
DOI
https://doi.org/10.1186/s12888-019-2289-y

Weitere Artikel der Ausgabe 1/2019

BMC Psychiatry 1/2019 Zur Ausgabe