Table 2.
Prevalence of low birth weight, conduct, hyperactivity, reading and mathematics problems by cohort and gender
| Boys |
|||
|---|---|---|---|
| 1958 Cohort (NCDS) n = 6344 | 2000/01 Cohort (MCS) n = 5731 | b/OR (95% CI), P | |
| Low birth weight, % (95% CI) | 5.7 (5.2, 6.2) | 6.0 (5.5, 6.5) | 1.03 (0.96, 1.09), P = 0.439 |
| Conduct, mean (SE) | 1.70 (0.19) | 1.59 (0.03) | −0.11 (−0.48, 0.26), P = 0.579 |
| Hyperactivity, mean (SE) | 3.47 (0.18) | 3.87 (0.04) | 0.40 (0.01, 0.80), P = 0.046 |
| Conduct, % high (95% CI) | 12.6 (6.8, 18.4) | 12.9 (11.9, 13.9) | 1.02 (0.79, 1.31), P = 0.850 |
| Hyperactivity, % high (95% CI) | 14.2 (7.9, 20.5) | 17.2 (16.1, 18.4) | 1.13 (0.87, 1.47), P = 0.343 |
| Reading, < −1SDa, % (95% CI) | 16.6 (15.7, 17.6) | 27.1 (25.4, 28.7) | 1.37 (1.29, 1.44), P < 0.001 |
| Maths, < −1SDa, % (95% CI) | 20.7 (19.7, 21.8) | 21.0 (19.5, 22.5) | 1.01 (0.95, 1.07), P = 0.758 |
|
| |||
| Girls | |||
|
| |||
| n = 6071 | n = 6304 | ||
|
| |||
| Low birth weight, % (95% CI) | 7.3 (6.7, 7.8) | 7.1 (6.5, 7.6) | 0.99 (0.93, 1.04), P = 0.617 |
| Conduct, mean (SE) | 1.52 (0.12) | 1.27 (0.02) | −0.25 (−0.48, −0.02), P = 0.026 |
| Hyperactivity, mean (SE) | 2.69 (0.18) | 2.95 (0.04) | 0.26 (−0.08, 0.62), P = 0.143 |
| Conduct, % high (95% CI) | 14.7 (11.1, 18.7) | 8.1 (7.2, 8.9) | 0.71 (0.63, 0.82), P < 0.001 |
| Hyperactivity, % high (95% CI) | 10.8 (3.2, 18.5) | 9.2 (8.4, 10.0) | 0.94 (0.65, 1.35), P = 0.725 |
| Reading, < −1SDa, % (95% CI) | 17.8 (16.8, 18.8) | 17.2 (15.7, 18.6) | 0.98 (0.92, 1.04), P = 0.435 |
| Maths, < −1SDa, % (95% CI) | 19.5 (18.5, 20.6) | 19.0 (17.6, 20.5) | 0.98 (0.93, 1.04), P = 0.586 |
a
Standardized within each cohort. Note, values of n are based on weighted proportions where data is available on all key outcomes (conduct, hyperactivity, reading and maths problems).