Father’s social class at birth |
High/middle class | 1.00 (ref) | 1.00 (ref) | 1.00 (ref) |
Working class | 1.54 (0.91 to 2.64) | 1.09 (0.78 to 1.53) | 1.34 (0.93 to 1.83) |
Unknown | 3.64 (1.75 to 7.53) | 1.94 (1.14 to 3.28) | 1.82 (0.90 to 2.92) |
Birth weight |
−2499 g | 1.75 (0.68 to 4.52) | 1.87 (0.95 to 3.66) | 2.06 (1.19 to 3.58) |
2500–3499 g | 0.96 (0.60 to 1.56) | 1.33 (0.95 to 1.83) | 1.24 (0.94 to 3.65) |
3500 g+ | 1.00 (ref) | 1.00 (ref) | 1.00 (ref) |
Härnquist IQ test score at age 12 |
per quartile decrease | 1.10 (0.88 to 1.35) | 1.16 (1.01 to 1.35) | 1.17 (1.04 to 1.33) |