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Table 1 Distribution of smoking before, during and after pregnancy among Canadian mothers (2005/06).

From: Prevalence of smoking during pregnancy and associated risk factors among Canadian women: a national survey

  N* % (95% CI)†
Smoking before pregnancy 16,823 22.0 (21.1-23.0)
Smoking after pregnancy 12,634 16.5 (15.7-17.4)
Smoking during pregnancy 8,015 10.5 (9.8-11.2)
Smoking during pregnancy frequency   
   Daily 5,253 6.9 (6.3-7.5)
   Occasionally 2,762 3.6 (3.2-4.1)
   Never 68,319 89.5 (88.8-90.2)
  1. * Sample size is estimated using population weights
  2. † 95% CI were calculated using bootstrapping technique