Hazard ratios for all cause mortality in young adulthood and early middle age (95% confidence intervals) in relation to paternal social class, adjusted for birth weight and childhood IQ, for 7308 male singletons born in 1953
| Mortality risk in age groups | ||
|---|---|---|
| Age 15–34 years (n=212) | Age 35–49 years (n=310) | |
| Father’s social class at birth | ||
| High/middle class | 1.00 (ref) | 1.00 (ref) |
| Working class | 1.32 (0.97 to 1.82) | 1.30 (1.02 to 1.65) |
| Unknown | 1.96 (1.19 to 3.23) | 1.72 (1.14 to 2.50) |
| Birth weight | ||
| −2400 g | 1.10 (0.53 to 2.27) | 1.87 (1.17 to 3.06) |
| 2500–3400 g | 1.09 (0.84 to 1.78) | 1.27 (1.01 to 1.60) |
| 3500 g+ | 1.00 (ref) | 1.00 (ref) |
| Härnquist IQ test at age 12 years | ||
| Lowest quartile | 1.29 (0.86 to 1.92) | 1.71 (1.23 to 2.37) |
| Second quartile | 1.26 (0.84 to 1.88) | 1.17 (0.81 to 1.65) |
| Third quartile | 1.02 (0.67 to 1.55) | 1.11 (0.77 to 1.59) |
| Higest quartile | 1.00 (ref) | 1.00 (ref) |