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Table 2 Characteristics of the intervention cohort (N = 2051) and the control cohort (N = 1788) at inclusion n = number of participants included in analysis

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
Single mother*   1072 1.9 1.1–2.7 994 3.8 2.6–5.0 0.01
Primiparous   2051 56.6 54.5–58.7 1785 48.6 46.3–50.9 <0.001
   n mean SD n mean SD  
Maternal age (years)   2044 28.6 4.6 1766 28.8 4.7 0.14
Maternal education (years)   283 16.1 2.2 514 15.8 2.3 0.05
Paternal education   289 15.4 2.7 523 15.2 2.9 0.34
No. of cig. a day among smokers at the beginning of pregnancy Mother 462 8.6 7.9 475 8.0 6.1 0.19
  Father 438 9.8 8.3 413 9.6 6.7 0.68
No. of cig. a day among smokers at inclusion Mother 140 5.3 7.4 184 4.9 4.0 0.57
  Father 355 8.8 8.6 356 8.2 6.4 0.27
  1. *Data from questionnaire 6 weeks postnatal
  2. Data available for 797 women and 812 men