Children’s psychometric test results, by trial allocation
| Control (n=409) No (%) | Intervention (n=404) No (%) | Difference in means Intervention control (95% CI) | P value* | Coefficient (95% CI)† | P value | |
| Standardised UNIT scores | ||||||
| Full-scale IQ, mean (SD) | 76.4 (14) | 77.6 (12.3) | 1.25 (−0.57 to 3.06) | 0.18 | 1.12 (−0.51 to 2.75) | 0.17 |
| Memory quotient, mean (SD) | 78.3 (14.6) | 79.7 (12.7) | 1.41 (−0.48 to 3.30) | 0.14 | 1.23 (−0.50 to 2.95) | 0.16 |
| Reasoning quotient, mean (SD) | 79.2 (14.3) | 80.4 (13.1) | 1.17 (−0.72 to 3.06) | 0.22 | 1.15 (−0.61 to 2.92) | 0.20 |
| Symbolic quotient, mean (SD) | 72 (12·2) | 73 (11.5) | 0.97 (−0.67 to 2.60) | 0.25 | 0.70 (−0.82 to 2.21) | 0.37 |
| Non-symbolic quotient, mean (SD) | 86.1 (15.5) | 87.5 (13.3) | 1.39 (−0.60 to 3.38) | 0.17 | 1.43 (−0.39 to 3.24) | 0.12 |
| Counting Stroop test | ||||||
| Completed Stroop test, N | 403 | 402 | – | – | – | |
| Interference score, mean (SD) | 1.7 (6.2) | 2.3 (6) | 0.57 (−0.26 to 1.41) | 0.18 | 0.54 (−0.34 to 1.43) | 0.23 |
| Facilitation score, mean (SD) | 7.2 (6.2) | 6.9 (6) | −0.28 (−1.11 to 0.55) | 0.51 | −0.28 (−1.17 to 0.60) | 0.52 |
*Unadjusted, derived from independent-samples t-test.
†Adjusted coefficients derived from linear regression models that included residence (rural vs rural), maternal literacy (cannot read vs can read easily or with difficulty), HOME score (continuous), tester (categorical) and children’s age in days as covariates.
HOME, Early Adolescent Home Observation Tool; UNIT, Universal Non-verbal Intelligence Test.