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Table 3 Maternal smoking prevalence among drop-outs

From: The impact of a minimal smoking cessation intervention for pregnant women and their partners on perinatal smoking behaviour in primary health care: A real-life controlled study

  Intervention cohort Control cohort  
  n % 95% CI n % 95% CI p-value
Drop-outs* 942 45.9 42.7–49.8 765 42.8 39.3–46.3 0.05
Maternal smoking prevalence at the beginning of pregnancy 877 25.1 22.2–28.0 729 27.3 24.1–30.5 0.33
Maternal smoking prevalence during pregnancy 877 9.1 7.2–11.0 723 12.4 10.0–14.8 0.03
  1. *Drop-outs = answered questionnaire in pregnancy but not answered questionnaire six weeks postnatal