Variable | Cases N = 113 | Controls N = 443 | p-value |
---|---|---|---|
Smoked throughout pregnancy | 10 (8.9%) | 69 (15.6%) | 0.07 |
Smoked steadily (within the same category of number of cigarettes) throughout pregnancy | 4 (3.4%) | 41 (9.3%) | 0.05 |
Average number of cigarettes/day, mean (SD)* | 1.20 (3.6) | 1.91 (4.7) | 0.08 |
Category of average number of cigarettes smoked per day | |||
0 | 90 (80.4%) | 340 (77.3%) | 0.69 |
1-10 | 16 (14.3%) | 67 (15.2%) | |
> 10 | 6 (5.4%) | 33 (7.5%) | |
Hair nicotine (ng/mg), mean (SD)# | 1.29 (2.9) | 1.94 (5.4) | 0.10 |