| Frequencies | OR (95 % CI) | ||
---|---|---|---|---|
Maternal smoking status | Cases n (%) | Controls n (%) | Unadjusted | Adjusteda |
Not smoking during pregnancy | 7068 (69.7Â %) | 33,158 (84.7Â %) | Reference | Reference |
Smoking during pregnancy (Yes/No) | 3064 (30.3 %) | 5653 (15.3 %) | 2.44 (2.32–2.58) | 1.75 (1.65–1.86) |
Smoking after first trimester | 2839 (28.1 %) | 5043 (13.7 %) | 2.54 (2.41–2.68) | 1.81 (1.71–1.93) |
Smoking only during first trimester | 225 (2.2 %) | 610 (1.7 %) | 1.66 (1.41–1.94) | 1.25 (1.05–1.48) |