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Erschienen in: BMC Cardiovascular Disorders 1/2020

Open Access 01.12.2020 | Research article

Determinants of childhood blood pressure using structure equation model: the CASPIAN–V study

verfasst von: Pooneh Angoorani, Shayan Mostafaei, Toktam Kiani, Hanieh-Sadat Ejtahed, Mohammad Esmaeil Motlagh, Gita Shafiee, Armita Mahdavi Gorabi, Mostafa Qorbani, Ramin Heshmat, Roya Kelishadi

Erschienen in: BMC Cardiovascular Disorders | Ausgabe 1/2020

Abstract

Background

Childhood hypertension is a predictor of later diseases, increases the risk for cardiovascular morbidity and mortality in adulthood and results in major economic burdens.
The purpose of this study was to investigate the direct and indirect effect of anthropometric, socioeconomic and lifestyle factors on blood pressure (BP) in a large population-based sample of children and adolescents using a path analysis.

Methods

This multi-centric nationwide study was performed on students aged 7–18 years. Anthropometric indices and blood pressure were measured by standard methods and demographic data, socioeconomic status, dietary habits and health related behaviors were obtained using validated questionnaires. Path analysis was applied to evaluate the relationships among the study variables and to implement the subsequent structural modeling.

Results

Totally, 7235 students (50.6% boys; the mean age 12.3 ± 3.1 years) were assessed. Systolic and diastolic BP positively correlated with age (r = 0.35 and 0.26; respectively), BMI (r = 0.06 and 0.04; respectively) and WC (r = 0.05 and 0.03; respectively). According to path analysis, age had significant direct effect on BMI, WC, and BP (β = 0.035, 0.043 and 0.345; respectively), which was greater for BP. BMI and WC had the greatest direct effect on BP (β = 0.05 and 0.03; respectively). Education level, subjective health complaints, health-related behaviors and dietary habits had positive direct effects on BP (β = 0.036, 0.030, 0.018 and 0.017; respectively). Socioeconomic status and positive changes in diet had negative indirect effect on BP (β = − 0.001 for both).

Conclusion

Our findings strengthen the importance of weight and body composition in BP control. It is suggested to improve diet and health related behaviors especially in families with low socioeconomic position.
Hinweise

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Abkürzungen
SES
Socio economic status
HRB
Health-related behaviors
SHC
Subjective health complaints
ST
Screen time
TV
Television
DH
Dietary habits
PFH
Positive family history
PCD
Positive changes in diet
BMI
Body mass index
WC
Waist circumference
BP
Blood pressure
SBP
Systolic blood pressure
DBP
Diastolic blood pressure
GSHS
Global school student health survey

Background

High blood pressure that originates early in life is a predictor of later diseases, increases the risk for cardiovascular morbidity and mortality in adulthood and results in major economic burdens [1, 2]. The estimated prevalence of hypertension in children is around 3.5%, which increases progressively with age [3]. High blood pressure was reported about 4% in Canadian children and adolescents [4]. The prevalence of hypertension was reported 6.82% among Iranian school children by considering the additive prevalence of pre hypertension and hypertension; isolated high systolic and diastolic blood pressure was documented in 4.17 and 4.33%, respectively [5]. Both genetic and environmental factors play roles in pathology of hypertension in children and adolescents [6]. The high prevalence of hypertension in kids is considered as a main threat for the widespread occurrence of overweight and obesity in the past few decades. Therefore, paying more attention to the factors associated with childhood hypertension would be helpful for primary prevention of its complications in adulthood.
Although numerous reports have documented higher blood pressure parallel to the rise in childhood obesity [7], it requires to be demonstrated at a population level, with considering effective environmental variables including socio economic status (SES), dietary pattern, physical activity and other heath related behaviors. Multivariate multistage model like path analysis (structural equation modeling) is more appropriate method for analyzing the relationship between behavioral and biological factors with blood pressure. This model is more reasonable than multiple regression with its single dependent variable and has significant advantages for its extreme power in evaluating the interplaying direct and indirect effects between several predictor and outcome variables [8]. We conducted this study aimed to better understand the direct and indirect associations among anthropometric, socioeconomic and lifestyle factors with blood pressure in children and adolescents, using path analysis method. The results of this study would be helpful for primary prevention of hypertension and consequent complications later in adulthood.

Methods

Study population and sampling framework

This survey was performed in urban and rural regions of Iran in 2015 as the fifth national study of a school-based surveillance program entitled the Childhood and Adolescence Surveillance and Prevention of Adult Non-communicable disease (CASPIAN-V) study. The study was conducted on students in primary and secondary schools aged 7–18 years. Selection of 14,286 students was done by multistage, stratified cluster sampling method from 30 provinces of the country (48 clusters of 10 students in each province). Descriptions of sampling and operation details of the study has been published previously [9]. The Research and Ethics Council of Isfahan University of Medical Sciences (code: 194049) ratified the study protocol. Written and verbal agreements were taken from all the parents and students, respectively.

Questionnaires

Two sets of the questionnaires were completed for students and their parents. The validate and reliable questionnaires were obtained from Global School Student Health Survey (GSHS) and translated to Persian [10]. The validity and reliability of the questionnaires has been assessed previously [11].
The student’s questionnaire, filled out by trained staff, had questions regarding the body image, and psychosocial environment of school, dietary habits, life-style habits and violence behavior. A team of health care professionals monitored all process.
The parent’s questionnaire, completed by trained interviewers, included questions about family composition, economic and socio-demographic factors and genetic determinants (family history of hypertension, diabetes, obesity), past history of student (birth weight, breastfeeding, type of complementary food), family dietary habits were included in the parent’s questionnaire.

Anthropometric measurements

Examinations were performed under standard protocols using calibrated instruments. The project team measured height, weight, and waist circumference using standard protocols which were described previously in details [12]. Body mass index (BMI) was calculated by dividing weight (kg) to height squared (m2). We used the WHO growth charts to categorize BMI [13]. Blood pressure was measured in the sitting position on the right arm using a standard mercury sphygmomanometer. It was measured two times with 5-min interval and the average was registered [14].

Factor definition

The method and items used for calculating family socioeconomic status (SES) were approved previously in the International Reading Literacy Study (PIRLS) [15]. Using principal component analysis, some variables/items including family assets (including house, car and computer), parental education and occupation, as well as the school type (private/public) were summarized in one main component for constructing family SES. Students were classified in low, moderate and high SES based on the score of this component.
For the health-related behaviors (HRB) factor, a validated questionnaire was used for estimating physical activity (hours/day). It was classified as the mild, moderate, vigorous, and extremely vigorous activities. The screen time (ST) behaviors were defined as the sum of the number of hours per day that participants spent watching television (TV), working with personal computer, or playing electronic games [16].
Subjective health complaints (SHC) were assessed by asking children to report the frequency of their experiences of a variety of emotional (feeling low, irritability, feeling nervous, difficulty in getting to sleep) and physical symptoms (headache, stomach ache, backache, feeling dizzy) during the past 6 months. Response options were ‘about every day’, ‘more than once a week’, ‘about every week’, ‘about every month’ and ‘rarely or never’. Then responses were categorized at weekly or more versus rarely or never. Items within the scale have shown an adequate content validity and test–retest reliability [17].
Dietary habits (DH) were assessed by asking children to report the eating pattern of items included dairy products, animal protein, plant protein, fast foods, salt, fatty snacks, vitamins/mineral supplement, sweets/candies, vegetables, fruits and carbohydrates [18]. History of hypertension, hyperlipidemia, diabetes, obesity, osteoporosis, heart attack or stroke and cancer in family members was considered as the positive family history (PFH) factor and reduction in consumption of high-fat foods, liquid oil, fast foods, sugar and salt, and alcohol drinks was considered as the positive changes in diet (PCD). All of the mentioned factors considered as continuous variables.

Statistical analysis

All continuous variables were checked for normality. Continuous variables were expressed as means (SD) or median (IQR) according to normal and non-normal distributions, respectively. Categorical variables were presented as number (percentage). Spearman correlation was used for evaluating the correlation between different demographic, anthropometric and physiological variables. Path analysis was applied to evaluate the direct, indirect and total effect of the study variables and to implement the subsequent structural modeling. The method of fitting of path modeling was least square (OLS). The preferred value of the fitness indices of models in path analysis including normed fit index, comparative fit index, goodness of fit index, and adjusted goodness of fit index is above 0.9. Regarding the root mean square error of approximation criteria, score ≤ 0.05 indicates a good fit, and score up to 0.08 means acceptable [19]. Software including SPSS-version 16 and Lisrel-version 8.8 were used for data analysis with the application of path analysis.

Results

In this national population-based study, among of 14,286 participants whose information was collected, 7235 were assessed (50.6% boys; the mean age: 12.3 ± 3.1 years). Difference between mean age of boys (12.4 ± 3.1) and girls (12.2 ± 3.2) was not statistically significant (P > 0.05). The mean of BMI, SBP and DBP was 26.5 ± 5.1, 99.1 ± 13.1 and 63.8 ± 10.4, respectively. The details of socioeconomic status, subjective health complaints, health-related behaviors and demographic characteristics of the participants are presented in Table 1.
Table 1
Demographic, anthropometric and physiological characteristics of the participants: CASPIAN-V study
Characteristics
Categories
Descriptive statistics
Age (Year)b
12.28 ± 3.158
Agea
7–10 (Year)
4843 (33.9%)
11–14(Year)
5600 (39.2%)
15–18(Year)
3843 (26.9%)
Gendera
Boy
7235 (50.7%)
Girl
7041 (49.3%)
Educational levela
Primary
8400 (58.8%)
Secondary
5886 (41.2%)
Body Mass Indexb
26.49 ± 5.079
DBP (mm/Hg) b
63.83 ± 10.435
SBP (mm/Hg)b
99.14 ± 13.10
SES (score)c
5.66 ± 1.710
Waist circumference (cm)b
87.61 ± 14.751
SHC (Score)c
32.14 ± 19.91
HRB (Score) c
11.12 ± 3.19
Area of residencya
Urban
10,200 (71.4%)
Rural
4086 (28.6%)
Family history of chronic diseasesa
No
1757 (12.3%)
Yes
12,529 (87.7%)
a indicated as N (%); b indicated as Mean ± SD; c indicated as median (IQR)
BMI Body mass index, DBP Diastolic blood pressure, SBP Systolic blood pressure, SES Socioeconomic status, WC Waist circumference, SHC Subjective health complaints, HRB Health-related behaviors;
The mean SBP and DBP against age groups are shown in Fig. 1. The Spearman’s rank correlation matrix between different demographic, anthropometric and physiological variables are presented in Table 2. According to this table, SBP and DBP had slightly positive correlation with age (r = 0.35 and 0.26; respectively), BMI (r = 0.06 and 0.04; respectively) and WC (r = 0.05 and 0.03; respectively). However, no significant correlations observed between blood pressure and SES, SHC and HRB. WC showed a positive correlation with all studied variables (P < 0.05).
Table 2
Matrix of Spearman’s rank correlation between different demographic, anthropometric and physiological variables (n = 14,286): CASPIAN -V study
 
BMI
DBP
SBP
SES
Waist
SHC
HRB
Age
0.04*
0.26***
0.35***
0.01
0.05*
0.02*
0.06*
BMI
1
0.04*
0.06*
0.17**
0.62***
0.03*
−0.001
DBP
1
0.66***
−0.013
0.03*
0.016
0.011
SBP
1
0.02*
0.05*
0.04
0.04*
SES
1
0.11**
0.05*
0.009
WC
1
0.06*
0.04*
SHC
1
−0.06*
HRB
1
* p < 0.05; ** p < 0.01; *** p < 0.001; BMI Body mass index, DBP Diastolic blood pressure, SBP Systolic blood pressure, SES Socioeconomic status, WC Waist circumference, SHC Subjective health complaints, HRB Health-related behaviors;
According to the correlation matrix of the variables, path diagram is modeled as Fig. 2. The path standardized coefficients (β) are shown as direct, indirect and total effects of each variable on BMI, WC and BP in Table 3. Higher SES was directly associated with BMI and WC. The effect of SES on BMI and WC was greater than ones on BP. Age had significant direct effect on all three outcome variables (BMI, WC, and BP), which was greater for BP. Education level had positive direct effects on BP. Positive family history factor showed minor negative direct effects on BMI and WC (P < 0.05) and had no effect on BP. Dietary habits had slight positive direct effect on both BMI and BP which was greater for BP. Positive changes in diet had positive direct effect only on BMI. Education level, health-related behaviors and dietary habits in our path models had positive indirect effect on BMI, however, their direct effects on this variable did not reach the significant threshold. Education level, SHC, HRB and DH had positive direct effects on BP (β = 0.036, 0.030, 0.018 and 0.017; respectively). SES and PCD had small negative indirect effect on BP (β = − 0.001 for both).
Table 3
Direct, indirect and total effect obtained by path analysis
Variables
BMI
WC
BP
Direct
Indirect
Total
Direct
Indirect
Total
Direct
Indirect
Total
Sex
−0.022
−0.003
− 0.025
0.0
− 0.003
−0.003
0.020
−0.002
0.018
Age
0.035
0.003
0.038
0.043
0.005
0.048
0.345
0.001
0.346
SES
0.133
0.0
0.133
0.080
0.001
0.081
0.0
−0.001
−0.001
Edu
0.0
0.083
0.083
0.0
0.049
0.049
0.036
−0.001
0.035
SHC
0.027
0.0
0.027
0.045
0.0
0.045
0.030
0.0
0.030
HRB
0.0
0.002
0.002
0.031
0.004
0.035
0.018
0.003
0.021
DH
0.0
0.001
0.001
−0.025
0.001
−0.024
0.017
0.001
0.018
PFH
−0.057
0.002
−0.055
−0.056
0.005
−0.051
0.0
0.0
0.0
PCD
0.024
−0.001
0.023
0.0
−0.004
−0.004
0.0
−0.001
− 0.001
Data presented as path standardized coefficients (β) for each cell; All of the path standardized coefficients are statistically significant (P-values < 0.05); BP Blood pressure, BMI Body mass index, WC Waist circumference, PCD Positive changes in diet, DH Dietary habits, PFH Positive family history, SHC Subjective health complaints, HRB Health-related behaviors, SES Socioeconomic status
There are a variety of fit indices to evaluate the model. All of them indicated that the model was acceptable fitted. The results of model fitness with accepted range for evaluating the validity of the model are characterized in Table 4.
Table 4
The results of fitness of model indices
Goodness of fitness
Model
Accepted Range
Normal Theory Weighted Least Squares Chi-Square
χ2/df=1.96 P-value< 0.001
< 2
Akaike information criterion (AIC)
154.115
Root Mean Square Error of Approximation
0.008
< 0.08
Goodness of Fit Index (GFI)
0.999
> 0.95
Adjusted Goodness of Fit Index (AGFI)
0.998
> 0.90
Parsimony goodness of fit index (PGFI)
0.320
Root mean square residual (RMR)
0.107
> 0.08
Normed fit index (NFI)
0.997
> 0.90
Relative fit index (RFI)
0.992
> 0.95
Parsimony normed fit index (PNFI)
0.378

Discussion

Our study clarified the obvious relations among anthropometric, socioeconomic and lifestyle factors with blood pressure in children and adolescents. To determine the true independent effects of anthropometric, socioeconomic and lifestyle factors on childhood blood pressure, we performed a path analysis that provides the full range of relations between variables. The path analysis revealed that among all variables (demographic and anthropometric) age had the greatest direct effect on BP, however, in the case of anthropometric variables, BMI and WC had the greatest direct effect. Moreover, by indirect-effects analysis, BP had negative correlations with SES and PCD while they had not direct effects on BP. The direct effects of weight and WC on BP were also reported in previous studies [20, 21]. High BP in childhood has increased with the epidemic of childhood obesity and reaching a prevalence of almost 5% of children and adolescents [22, 23]. Obesity has been known as a major risk factor of increased BP among children and adolescents. Furthermore, the latest studies reveal that in comparison to general obesity, central obesity has more powerful relationship with BP and other cardiovascular risk factors [24]. The BP depends on the blood flow and vascular resistance which in turn is determined by vasoconstriction and rigidity [25]. Studies in youths have found that blood flow pattern is influenced by weight and body composition. In the obese, high vascular resistance plays a major role as a cause of hypertension and hemodynamic load both on the heart and vessels, and also is considered as an important cardiovascular risk factor [21, 26, 27]. It was shown that that visceral fat is the primary etiological component underlying the effect of excess adiposity on development of hypertension, implicating the stronger association of BP with WC compared with BMI [28]. Adipose tissue is known to play important roles in vascular impedance and BP by releasing free fatty acids, thereby central adiposity seems to be especially deleterious because of the metabolic characteristics of fat stored in the intra-abdominal visceral compartment [29]. To find children at risk for increased BP could be based on recognizing the body composition characters. In this context, studies investigating the relationship of overall and abdominal obesity with elevated BP in children are necessary.
In current study, we also showed that the higher socioeconomic status and positive changes in diet can indirectly lead to beneficial effect on BP. The effect of SES indicators such as education attainment, household income or employment status on health is well established. A large body of research revealed that higher socioeconomic position individuals are healthier overall. Low education and low income are well-known causes of poor health and chronic medical diseases such as obesity, depression, and asthma [3032]. The same rule seems to apply to BP. It was shown that higher socioeconomic position were protective against high BP [33].
The beneficial effect of healthier diet on BP, which was shown in this study, was also demonstrated in previous evidence. Dietary habit is considered one of the major modifiable determinants of hypertension and related chronic diseases in children and adolescents. Scientific evidences reveal the fact that a healthy diet pattern consisting of a daily intake of fruits and vegetables combined with a low consumption of salt, sugar, and saturated fat, in addition to industrially-produced-trans-fatty acids, is associated with a better cardio-metabolic profile both in adults and in children [34, 35]. High BP inchildren could be prevented or modified by correcting the inappropriate behaviors and unhealthy lifestyle [36]. Therefore, childhood is an important period for interventions to improve lifestyle to minimize long-term metabolic abnormalities.
Using path analysis for evaluating of the direct and indirect effect of anthropometric, socioeconomic and lifestyle factors on blood pressure in a large sample of Iranian children and adolescents is the strength of present study. While the cross-sectional design of our study represents a limitation for the emerged associations that cannot be considered causal. Moreover, the information on socioeconomic status and health-related behaviors was obtained by self-reporting which may affect the estimates by under- or over-reporting.

Conclusion

Results of this study strengthen the importance of weight and waist circumference in blood pressure control. Our data also supports the need to improve dietary habits and health related behaviors especially in families with low socioeconomic position.

Acknowledgements

The authors are thankful of all participants and large team working on this project in different provinces.
The study protocol was approved by the Research and Ethics Council of Isfahan University of Medical Sciences (code: 194049). Written informed consent and verbal assent were obtained from all the parents and students, respectively.
Not applicable.

Competing interests

The authors declare that they have no competing interests.
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Metadaten
Titel
Determinants of childhood blood pressure using structure equation model: the CASPIAN–V study
verfasst von
Pooneh Angoorani
Shayan Mostafaei
Toktam Kiani
Hanieh-Sadat Ejtahed
Mohammad Esmaeil Motlagh
Gita Shafiee
Armita Mahdavi Gorabi
Mostafa Qorbani
Ramin Heshmat
Roya Kelishadi
Publikationsdatum
01.12.2020
Verlag
BioMed Central
Erschienen in
BMC Cardiovascular Disorders / Ausgabe 1/2020
Elektronische ISSN: 1471-2261
DOI
https://doi.org/10.1186/s12872-020-01488-z

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