Table 2.
Comparison of those with missing data during follow-up versus those with complete data throughout, according to level of adolescent externalising behaviour (none, mild, severe). Figures are means (SD) unless stated otherwise
| None | Mild | Severe | ||||||
|---|---|---|---|---|---|---|---|---|
| Complete data (n=1476) | Any missing data (n=777) | Complete data (n=629) | Any missing data (n=422) | Complete data (n=192) | Any missing data (n=156) | |||
| Sex (% male) | 46.5 | 53.3** | 52.0 | 59.0* | 57.8 | 68.6* | ||
| Father’s social class (% manual) | 52.2 | 55.1 | 62.8 | 65.5 | 69.3 | 78.6 | ||
| Cognitive ability at age 8 | 23.2 (6.8) | 22.6 (7.2)* | 20.8 (6.7) | 19.9 (7.3)* | 20.4 (7.5) | 17.4 (7.1)*** | ||
| Depression/anxiety: | ||||||||
| At age 13 | 21.1 (1.9) | 21.3 (2.1) | 21.3 (2.1) | 21.7 (2.3)** | 21.2 (2.7) | 21.6 (2.6) | ||
| At age 15 | 21.3 (2.0) | 21.4 (2.1) | 21.4 (2.2) | 21.9 (2.6)** | 22.0 (2.8) | 22.2 (3.3) | ||
| Externalising: | ||||||||
| At age 13 | 7.7 (0.8) | 7.8 (0.8) | 9.7 (1.5) | 9.7 (1.4) | 11.8 (2.4) | 12.0 (2.6) | ||
| At age 15 | 7.7 (0.8) | 7.8 (0.8)* | 9.7 (1.5) | 9.9 (1.5)* | 12.7 (2.4) | 13.1 (2.5) | ||
*P<0.05, **P<0.01, ***P<0.001.