Category of exposure | No. of cases/controls | Follow-up time (years, mean ± SD) | Model 1 | Model 2 | ||
---|---|---|---|---|---|---|
HR (95% CI) | P-value | HR (95% CI) | P-value | |||
Maternal smoking | ||||||
 No | 43,010/240,235 | 8.5 ± 1.7 | Ref |  | Ref |  |
 Yes | 19,130/97,156 | 8.5 ± 1.7 | 1.17 (1.14, 1.20) | < 0.001 | 1.11 (1.09, 1.13) | < 0.001 |
Breastfeeding | ||||||
 No | 12,420/87,204 | 8.3 ± 2.0 | Ref |  | Ref |  |
 Yes | 40,031/216,424 | 8.1 ± 2.2 | 0.97 (0.94, 1.00) | 0.088 | 0.96 (0.94, 0.98) | 8.46E−04 |