Table 5.
Rate ratios* (95% confidence interval) for mortality from ischaemic heart disease 1958-95 by fourths of birth weight and birth weight for gestational age for all traced singleton live male births at Uppsala Academic Hospital, 1915-29
| Fourth (No of deaths) | Mean birth weight (g) | Range of birth weight (g) | Crude rate ratio (95% CI) | Mutually adjusted rate ratio (95% CI) |
|---|---|---|---|---|
| Birth weight | ||||
| 1st (n=203) | 2899 | 1080 to 3210 | 1.00 | 1.00 |
| 2nd (n=173) | 3381 | 3220 to 3530 | 0.83 (0.67 to 1.01) | 0.98 (0.76 to 1.27) |
| 3rd (n=152) | 3686 | 3535 to 3850 | 0.73 (0.59 to 0.90) | 1.05 (0.75 to 1.46) |
| 4th (n=133) | 4161 | 3855 to 5300 | 0.68 (0.54 to 0.84) | 0.98 (0.63 to 1.52) |
| P value for trend | 0.001 | 0.164 | ||
| Birth weight for gestational age | ||||
| 1st (n=207) | 2949 | 1080 to 3530 | 1.00 | 1.00 |
| 2nd (n=183) | 3380 | 2230 to 3790 | 0.81 (0.66 to 0.98) | 0.80 (0.62 to 1.04) |
| 3rd (n=127) | 3664 | 2700 to 4050 | 0.63 (0.50 to 0.78) | 0.61 (0.43 to 0.86) |
| 4th (n=144) | 4113 | 3040 to 5300 | 0.67 (0.54 to 0.82) | 0.67 (0.43 to 1.02) |
| P value for trend | < 0.001 | 0.003 | ||
*
Adjusted for period of birth as a three-level categorical variable (1915-9, 1920-4, 1925-9).