Sex |
M | 2892 (45.0) | 1 | 0.051 | | 1 | <0.001 |
F | 3528 (55.0) | 1.21 (1.00 to 1.46) | | | 1.33 (1.14 to 1.55) | |
Maternal smoking in pregnancy |
No | 2887 (45.0) | 1 | 0.669 | | 1 | 0.708 |
Stopped prior | 861 (13.4) | 1.03 (0.78 to 1.37) | | | 1.18 (0.94 to 1.47) | |
Stopped during | 305 (4.8) | 0.97 (0.63 to 1.50) | | | 0.90 (0.63 to 1.30) | |
<5/day | 453 (7.1) | 1.09 (0.77 to 1.56) | | | 0.87 (0.64 to 1.19) | |
5–14/day | 1245 (19.4) | 1.04 (0.81 to 1.34) | | | 1.15 (0.94 to 1.40) | |
⩾15/day | 669 (10.4) | 0.81 (0.58 to 1.14) | | | 0.99 (0.77 to 1.27) | |
Birth weight (kg) |
<2 | 66 (1.0) | 1.99 (0.96 to 4.12) | 0.004 | | 1.53 (0.80 to 2.92) | 0.001 |
2–2.5 | 263 (4.1) | 1.33 (0.86 to 2.06) | | | 1.02 (0.70 to 1.49) | |
2.5–3 | 1194 (18.6) | 1.21 (0.95 to 1.55) | | | 1.24 (1.02 to 1.51) | |
3–3.5 | 2505 (39.0) | 1 | | | 1 | |
3.5–4 | 1818 (28.3) | 0.94 (0.74 to 1.18) | | | 0.92 (0.76 to 1.10) | |
>4 | 574 (8.9) | 0.81 (0.55 to 1.18) | | | 0.75 (0.56 to 1.02) | |
Paternal social class at birth |
I | 381 (5.9) | 1.60 (1.09 to 2.35) | 0.0073-2
| | 0.94 (0.67 to 1.33) | 0.9793-2 |
II | 859 913.4) | 1.21 (0.91 to 1.61) | | | 0.93 (0.73 to 1.18) | |
III NM | 923 (14.4) | 1.12 (0.85 to 1.49) | | | 1.05 (0.84 to 1.31) | |
III M (baseline) | 2839 (44.2) | 1 | | | 1 | |
IV | 824 (12.8) | 0.93 (0.68 to 1.26) | | | 0.85 (0.67 to 1.07) | |
V | 272 (4.2) | 0.95 (0.58 to 1.57) | | | 1.16 (0.82 to 1.64) | |
Other | 322 (5.0) | 1.60 (1.11 to 2.32) | | | 1.13 (0.82 to 1.56) | |
Older children in house, age 5 |
None | 2637 (41.1) | 1 | 0.034 | | 1 | 0.749 |
1 | 2287 935.6) | 0.82 (0.65 to 1.04) | | | 0.96 (0.80 to 1.16) | |
2 | 961 (15.0) | 0.67 (0.49 to 0.93) | | | 0.96 (0.76 to 1.22) | |
>2 | 535 (8.3) | 0.79 (0.54 to 1.16) | | | 0.97 (0.72 to 1.29) | |
Younger children in the house, age 5 |
None | 3610 (56.2) | 1 | 0.757 | | 1 | 0.277 |
1 | 2480 (38.6) | 1.02 (0.83 to 1.27) | | | 0.99 (0.84 to 1.18) | |
>1 | 330 (5.1) | 0.85 (0.55 to 1.33) | | | 0.73 (0.51 to 1.06) | |
Highest qualification at 26 |
None | 345 (5.4) | 0.70 (0.41 to 1.17) | 0.876 | | 1.01 (0.72 to 1.43) | 0.526 |
CSE/NVQ1 | 1108 (17.3) | 1 | | | 1 | |
O/NVQ2 | 2682 (41.8) | 0.94 (0.72 to 1.22) | | | 1.04 (0.84 to 1.28) | |
A/Higher | 966 (15.0) | 1.03 (0.75 to 1.41) | | | 1.10 (0.85 to 1.42) | |
Degree | 1319 (20.5) | 0.89 (0.65 to 1.23) | | | 1.07 (0.83 to 1.40) | |
Smoking at 26 |
Never | 3126 (48.7) | 1 | 0.496 | | 1 | <0.001 |
Ex | 1001 (15.6) | 1.17 (0.91 to 1.50) | | | 1.08 (0.84 to 1.28) | |
Current (<10 cigs/day) | 898 (14.0) | 0.92 (0.69 to 1.23) | | | 1.49 (1.19 to 1.86) | |
Current (⩾10 cigs/day) | 1395 (21.7) | 0.93 (0.73 to 1.20) | | | 2.35 (1.96 to 2.82) | |
Quintile of height at 26 |
1 | 1357 (21.1) | 1 | 0.214 | | 1 | 0.442 |
2 | 1651 (25.7) | 1.03 (0.80 to 1.34) | | | 1.04 (0.84 to 1.28) | |
3 | 1343 (20.9) | 1.03 (0.78 to 1.36) | | | 1.06 (0.84 to 1.32) | |
4 | 1008 (15.7) | 0.90 (0.65 to 1.23) | | | 0.96 (0.75 to 1.24) | |
5 | 1061 (16.5) | 0.85 (0.62 to 1.17) | | | 1.15 (0.90 to 1.47) | |
Quintile of BMI at 26 |
1 | 1340 (20.9) | 1 | <0.001 | | 1 | 0.001 |
2 | 1298 (20.2) | 1.02 (0.75 to 1.38) | | | 1.02 (0.81 to 1.29) | |
3 | 1241 (19.3) | 1.18 (0.88 to 1.60) | | | 0.94 (0.74 to 1.20) | |
4 | 1317 (20.5) | 1.17 (0.87 to 1.58) | | | 1.13 (0.90 to 1.42) | |
5 | 1224 (19.1) | 1.72 (1.29 to 2.29) | | | 1.44 (1.15 to 1.81) | |