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Table 1 Association between pregnancy planning status and smoking status

From: Pregnancy planning, smoking behaviour during pregnancy, and neonatal outcome: UK millennium cohort study

  Smoking status just before pregnancy Total n (%)
  Never smoked n (%) Ex-smoker n (%) Smoker: decreased or quit in pregnancy n (%) [within smoker%] Smoker: no change in pregnancy n (%) [within smoker%]
Mothers who planned pregnancy 5,870 (62.3) 1,173 (12.4) 1,955 (21.1) [82.1] 425 (4.5) [17.9] 9,463 (100) [100]
Mothers who did not plan pregnancy 3,674 (45.9) 574 (7.2) 2,902 (36.2) [77.1] 860 (10.7) [22.9] 8,010 (100) [100]
  1. Chi square for heterogeneity p < 0.001.