Table 1 Cohort characteristics and missingness
Variable | Original data | Imputed data (M = 10) | ||||
|---|---|---|---|---|---|---|
N | % Missing | Mean (SD) for continuous variables, % for categorical variables | Mean (SD) for continuous variables, % for categorical variables | |||
Overall (N = 3769) | Not Bereaved (N = 2891) | Bereaved (N = 878) | ||||
SDQ at 6 | 3448 | 8.4% | 7.1 (4.6) | 7.0 (4.5) | 7.3 (4.7) | 7.1 (4.6) |
SDQ at 9 | 3668 | 2.6% | 6.4 (4.7) | 6.4 (4.6) | 6.7 (4.9) | 6.4 (4.7) |
SDQ at 11 | 3618 | 3.9% | 6.1 (4.7) | 6.1 (4.7) | 6.4 (4.8) | 6.1 (4.7) |
SDQ at 13 | 3522 | 6.5% | 6.4 (4.7) | 6.2 (4.7) | 6.7 (4.9) | 6.4 (4.8) |
SDQ at 16 | 3276 | 13.0% | 5.8 (4.6) | 5.8 (4.5) | 6.1 (4.8) | 5.9 (4.7) |
Frequency (%) attends school at 16 | 2996 | 20.4% | 94.1 (18.9) | 94.2 (18.9) | 93.9 (19.3) | 93.5 (20.0) |
Number of friends | 3143 | 16.5% | 7.7 (5.1) | 7.7 (5.2) | 7.7 (4.9) | 7.7 (5.2) |
AUDIT score | 3175 | 15.7% | 7.0 (4.8) | 6.9 (4.8) | 7.3 (4.9) | 7.0 (4.9) |
Blood pressure | 3482 | 7.5% | 118.3 (10.6) | 118.3 (10.7) | 118.3 (10.5) | 118.3 (10.7) |
Body mass index | 3679 | 2.3% | 22.7 (4.1) | 22.6 (4.0) | 22.9 (4.5) | 22.7 (4.1) |
C-reactive protein | 2456 | 34.8% | 1.5 (3.8) | 1.5 (3.8) | 1.7 (4.0) | 1.6 (4.3) |
Hours of sleep, weekday | 3094 | 17.8% | 8.3 (0.9) | 8.3 (0.9) | 8.3 (1.0) | 8.2 (0.9) |
Life events, 5–7 years | 3465 | 8.0% | 2.8 (3.1) | 2.6 (3.1) | 3.2 (3.3) | 2.8 (3.2) |
Child sex, male | 3766 | 0.0% | 44.2 | 44.7 | 42.6 | 44.2 |
Mother prenatal financial difficulties | 3494 | 7.2% | 2.2 (3.1) | 2.2 (3.1) | 2.3 (3.1) | 2.3 (3.1) |
Father educational attainment: | 3509 | 6.8% | – | – | – | – |
CSE/none | 15.1 | 14.9 | 15.5 | 15.9 | ||
Vocational | 7.0 | 7.2 | 6.3 | 7.2 | ||
O level | 21 | 20.1 | 23.9 | 21 | ||
A level | 29.1 | 29.2 | 28.9 | 28.6 | ||
Degree | 27.8 | 28.6 | 25.3 | 27.2 | ||
Mother educational attainment: | 3578 | 5.0% | – | – | – | – |
CSE/none | 8.9 | 8.5 | 10.2 | 9.2 | ||
Vocational | 6.7 | 6.5 | 7.5 | 6.9 | ||
O level | 33.8 | 33.1 | 36.3 | 33.7 | ||
A level | 29.2 | 29.8 | 26.8 | 28.8 | ||
Degree | 21.4 | 22 | 19.1 | 21.3 | ||
Maternal smoking at birth | 3397 | 9.8% | 10.8 | 11.1 | 9.7 | 11.3 |
Townsend Index quintile: | 2067 | 45.1% | – | – | – | – |
1 | 31.7 | 32.0 | 30.5 | 32.1 | ||
2 | 15.7 | 15.5 | 16.3 | 15.3 | ||
3 | 19.9 | 19.5 | 21.1 | 20.0 | ||
4 | 23.7 | 23.8 | 23.1 | 23.6 | ||
5 | 9.0 | 9.1 | 8.9 | 8.9 | ||