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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.