| |
Frequencies
|
OR (95 % CI)
|
|---|
|
Maternal smoking status
|
Cases n (%)
|
Controls n (%)
|
Unadjusted
|
Adjusteda
|
|---|
|
Not smoking during pregnancy
|
7068 (69.7 %)
|
33,158 (84.7 %)
|
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)
|
- OR odds ratio, CI confidence interval
- aAdjusted for maternal and paternal psychiatric history, maternal substance use history, maternal and paternal age at birth, maternal socioeconomic status, birth weight for gestational age, number of previous births and maternal marital status
