Table 3

Cohort baseline smoking status

Smoking status at baselineN=850Per cent95% CI
Completely stopped smoking at some time in the 3 months prior to pregnancy617.25.6 to 9.1
Completely stopped smoking after finding out pregnant30135.432.2 to 38.6
Smoke occasionally, not every day now pregnant11713.811.6 to 16.2
Smoke everyday, cut down during pregnancy30435.832.6 to 39.0
Smoke everyday, same as before pregnancy647.55.9 to 9.5
Smoke everyday, more than before pregnancy30.40.01 to 1