Introduction
Method
Study Design and Experimental Sample
Randomization and Masking
Intervention
Data Collection
Outcome Measures
Program Moderators
Statistical Analysis
Results
Sample Description
Treatment group: early admission (n = 1480) | Control group: delayed admission (n = 1434) | Adjusted difference |
p value | |
---|---|---|---|---|
Child age on September 1, 2012; mean (SD) | 9.5 (2.2) | 9.5 (2.2) | 0.02 | 0.763 |
Female | 1474 (54%) | 1409 (52%) | 2.1% | 0.255 |
Child’s household has | ||||
Computer | 1464 (84%) | 1400 (85%) | 0.1% | 0.958 |
Internet | 1455 (70%) | 1396 (73%) | −0.9% | 0.605 |
Cable television | 1461 (79%) | 1398 (81%) | −2.3% | 0.161 |
Washing machine | 1467 (95%) | 1399 (96%) | −0.09% | 0.915 |
Water filter | 1461 (55%) | 1390 (54%) | 1.8% | 0.368 |
Microwave | 1461 (69%) | 1393 (69%) | 0.4% | 0.845 |
Telephone (landline) | 1443 (86%) | 1391 (85%) | 1.1% | 0.403 |
Mother lives with child | 1418 (97%) | 1348 (96%) | 0.3% | 0.722 |
Mother has ≥1 year of tertiary schooling | 1416 (54%) | 1338 (57%) | −0.8% | 0.693 |
Father lives with child | 1298 (76%) | 1280 (77%) | −1.5% | 0.412 |
Father has ≥1 year of tertiary schooling | 1285 (45%) | 1278 (48%) | −2.4% | 0.265 |
Variable (expected sign of the estimate) | Sub-domain | Denominator (individual) | Adjusted difference |
p value | |
---|---|---|---|---|---|
Intervention | Control | ||||
(n = 1307) | (n = 1268) | ||||
Self-regulatory skills | |||||
Self-control (+) | Self-control | −0.023 | 0.023 | −0.066 | 0.104 |
Self-control—guardian (+) | Self-control | −0.037 | 0.037 | −0.083 | 0.049 |
Delay discount (+) | Future orientation | −0.050 | 0.054 | −0.084 | 0.152 |
Go/no-go-commission (−) | Response inhibition | −0.023 | 0.024 | −0.021 | 0.618 |
Flanker, interference score (−) | Attention | −0.030 | 0.030 | −0.075 | 0.116 |
Tower of London (−) | Planning skills | −0.018 | 0.020 | −0.041 | 0.526 |
Behaviors | |||||
Prosocial behavior (+) | Prosocial behavior | 0.008 | −0.008 | 0.020 | 0.630 |
Prosocial behavior—guardian (+) | Prosocial behavior | −0.034 | 0.034 | −0.077 | 0.062 |
Aggressive behavior (−) | Aggressive behavior | −0.003 | 0.003 | −0.004 | 0.917 |
Aggression propensity (−) | Aggression propensity | −0.004 | 0.004 | 0.001 | 0.984 |
Aggression—guardian (−) | Aggressive behavior | 0.022 | −0.023 | 0.060 | 0.150 |
Risky driving (−) | Propensity risk-taking | −0.023 | 0.023 | −0.036 | 0.413 |
Difficulties (−) | Behavioral difficulties | 0.034 | −0.035 | 0.079 | 0.049 |
Difficulties—guardian (−) | Behavioral difficulties | 0.032 | −0.033 | 0.064 | 0.122 |
Interpersonal functioning—guardian (+) | Other related skills | −0.043 | 0.045 | −0.071 | 0.100 |
Prosocial skills and connections | |||||
Empathy (+) | Empathy | 0.003 | −0.003 | 0.028 | 0.489 |
Self-esteem (+) | Self-esteem | −0.016 | 0.016 | −0.023 | 0.570 |
Family involvement—guardian (+) | Family engagement | −0.022 | 0.023 | −0.029 | 0.509 |
School functioning—guardian (+) | School engagement | −0.007 | 0.008 | −0.013 | 0.745 |
Affective strengths—guardian (+) | Affective skills | −0.014 | 0.014 | −0.021 | 0.622 |
Career strengths—guardian (+) | Career orientation | −0.018 | 0.019 | −0.037 | 0.385 |
Intrapersonal strengths—guardian (+) | Self-related skills | −0.026 | 0.026 | −0.054 | 0.212 |
Cognitive skills | |||||
Score forward (+) | Working memory | 0.019 | −0.019 | 0.039 | 0.373 |
Score backward (+) | Working memory | 0.023 | −0.023 | 0.056 | 0.204 |
Raven (+) | Visual-spatial skills | −0.023 | 0.023 | −0.034 | 0.429 |
Symbol search (+) | Processing speed | −0.006 | 0.006 | −0.020 | 0.627 |
Attrition
Treatment group: early admission (n = 1044) | Control group: delayed admission (n = 1065) | Adjusted difference |
p value | |
---|---|---|---|---|
Child age on September 1, 2012; mean (SD) | 9.5 (2.2) | 9.4 (2.1) | 0.11 | 0.224 |
Female | 1044 (54%) | 1065 (53%) | 1.4% | 0.533 |
Child’s household has | ||||
Computer | 1037 (84%) | 1062 (84%) | 1.03% | 0.542 |
Internet | 1031 (69%) | 1059 (72%) | −0.04% | 0.983 |
Cable television | 1034 (78%) | 1060 (81%) | −2.57% | 0.173 |
Washing machine | 1040 (95%) | 1061 (95%) | 0.38% | 0.700 |
Water filter | 1035 (53%) | 1053 (54%) | 0.34% | 0.889 |
Microwave | 1036 (68%) | 1056 (69%) | 0.72% | 0.753 |
Telephone (landline) | 1024 (85%) | 1054 (86%) | −0.18% | 0.906 |
Mother lives with child | 1006 (97%) | 1025 (96%) | 0.87% | 0.356 |
Mother has ≥1 year of tertiary schooling | 1006 (54%) | 1017 (57%) | −0.99% | 0.689 |
Father lives with child | 918 (75%) | 978 (78%) | −2.73% | 0.210 |
Father has ≥1 year of tertiary schooling | 906 (43%) | 975 (47%) | −2.95% | 0.249 |
Uptake and Implementation
Impacts
Variable (expected sign of the estimate) | Denominator (individual) | ||||
---|---|---|---|---|---|
Intervention | Control | ITT effect size (90% CI) |
p value | ||
N obs | N obs | ||||
Self-regulatory skills | |||||
Self-control (+) | 1027 | 1051 | 0.095 | (0.013 to 0.177) | 0.056†
|
Self-control—guardian (+) | 1026 | 1040 | 0.039 | (−0.036 to 0.113) | 0.392 |
Delay discount (+) | 477 | 446 | 0.031 | (−0.103 to 0.164) | 0.705 |
Go/no-go-commission (−) | 853 | 854 | 0.037 | (−0.057 to 0.131) | 0.518 |
Flanker, interference score (−) | 547 | 561 | 0.102 | (−0.021 to 0.225) | 0.171 |
Tower of London (−) | 415 | 387 | 0.064 | (−0.061 to 0.188) | 0.401 |
Behaviors | |||||
Prosocial behavior (+) | 1025 | 1050 | −0.017 | (−0.104 to 0.070) | 0.748 |
Prosocial behavior (SDQ)—guardian (+) | 1030 | 1048 | 0.062 | (−0.022 to 0.146) | 0.227 |
Aggressive behavior (−) | 1025 | 1048 | −0.015 | (−0.108 to 0.079) | 0.794 |
Aggression propensity (−) | 1024 | 1049 | −0.011 | (−0.091 to 0.068) | 0.816 |
Aggression—guardian (−) | 1029 | 1049 | −0.014 | (−0.098 to 0.070) | 0.781 |
Risky driving (−) | 854 | 891 | 0.017 | (−0.070 to 0.103) | 0.752 |
Difficulties (−) | 1025 | 1048 | −0.081 | (−0.160 to −0.003) | 0.088†
|
Difficulties—guardian (−) | 1029 | 1048 | 0.026 | (−0.045 to 0.097) | 0.547 |
Interpersonal functioning—guardian (+) | 1027 | 1048 | −0.014 | (−0.089 to 0.061) | 0.762 |
Prosocial skills and connections | |||||
Empathy (+) | 1024 | 1049 | 0.007 | (−0.073 to 0.086) | 0.892 |
Self-esteem (+) | 1027 | 1051 | 0.026 | (−0.058 to 0.111) | 0.61 |
Family involvement—guardian (+) | 1028 | 1048 | −0.063 | (−0.152 to 0.025) | 0.24 |
School functioning—guardian (+) | 1027 | 1048 | −0.04 | (−0.116 to 0.035) | 0.38 |
Affective strengths—guardian (+) | 1028 | 1049 | −0.03 | (−0.115 to 0.055) | 0.565 |
Career strengths—guardian (+) | 1028 | 1049 | 0.037 | (−0.046 to 0.120) | 0.464 |
Intrapersonal strengths—guardian (+) | 1025 | 1048 | −0.035 | (−0.119 to 0.049) | 0.495 |
Cognitive skills | |||||
Score forward (+) | 904 | 921 | −0.087 | (−0.175 to 0.001) | 0.106 |
Score backward (+) | 901 | 915 | −0.074 | (−0.165 to 0.017) | 0.183 |
Raven (+) | 894 | 921 | −0.022 | (−0.100 to 0.056) | 0.646 |
Symbol search (+) | 917 | 927 | 0.024 | (−0.060 to 0.108) | 0.634 |
Denominator (individual) | ITT effect size (90% CI) |
p value | ||||
---|---|---|---|---|---|---|
Intervention | Control | |||||
N obs | N obs | |||||
Mother’s education | ||||||
Mother without college | Self-regulatory skills | |||||
Self-control (+) | 455 | 424 | 0.177 | (0.057 to 0.298) | 0.016 | |
Behaviors | ||||||
Difficulties (−) | 455 | 423 | −0.134 | (−0.253 to −0.016) | 0.062 | |
Mother with college | Prosocial skills and connections | |||||
Family involvement—guardian (+) | 535 | 575 | −0.209 | (−0.320 to −0.098) | 0.002 | |
Intrapersonal strengths—guardian (+) | 533 | 574 | −0.142 | (−0.248 to −0.035) | 0.028 | |
Gender and violence | ||||||
Boys exposed to violence | Behaviors | |||||
Aggressive behavior (−) | 220 | 223 | −0.242 | (−0.450 to −0.034) | 0.056 | |
Difficulties (−) | 219 | 224 | −0.253 | (−0.415 to −0.092) | 0.01 | |
Self-regulatory skills | ||||||
Self-control (+) | 220 | 224 | 0.205 | (0.039 to 0.370) | 0.042 | |
Boys not exposed to violence | Self-regulatory skills | |||||
Self-control (+) | 252 | 266 | 0.180 | (0.022 to 0.337) | 0.061 | |
Girls exposed to violence | Prosocial skills and connections | |||||
Empathy (+) | 213 | 265 | −0.179 | (−0.336 to −0.023) | 0.059 | |
Girls not exposed to violence | Cognitive skills | |||||
Score backward (+) | 300 | 256 | −0.251 | (−0.403 to −0.099) | 0.007 | |
Behaviors | ||||||
Prosocial behavior (+) | 341 | 296 | −0.167 | (−0.316 to −0.017) | 0.068 | |
Age | ||||||
Younger (aged 6 to 9) | Self-regulatory skills | |||||
Self-control (+) | 544 | 583 | 0.134 | (0.021 to 0.248) | 0.052 | |
Older (aged 10 to 14) | Self-regulatory skills | |||||
Go/no-go-commission (−) | 416 | 390 | 0.168 | (0.049 to 0.287) | 0.02 |