Table 2

Comparison of maternal characteristics across the five smoking groups

Never smokedEx-smokerQuit in first trimesterReduced cigarette consumptionNo reduction in cigarette consumptionp Value
Mean (SD) maternal height (cm)163.2 (6.5) n=1076163.8 (6.1) n=346162.9 (6.0) n=186162.5 (5.8) n=331162.4 (6.4) n=590.055*
Mean (SD) age started smoking (years)16.4 (2.6) n=34515.9 (2.7) n=18914.9 (2.5) n=33114.5 (2.4) n=59<0.001*
Median (range) SIMD quintile4 (1–5) n=10704 (1–5) n=3444 (1–5) n=1843 (1–5) n=3282 (1–5) n=59<0.001†
Median (range) daily cigarettes when first pregnant0010 (1–30) n=18520 (1–60) n=33020 (1–40) n=59<0.001†
Median (range) daily cigarettes in third trimester00010 (1–20) n=18212 (3–30) n=300.047‡
% With partner who smokes9% (93/1077)88% (43/49)76% (38/50)67% (114/196)72% (23/32)<0.001§
  • Trend tests were as follows:

  • * ANOVA (with Bonferroni correction).

  • Kruskal–Wallis test (comparison between three groups).

  • Mann–Whitney test.

  • § χ2test.

  • SIMD, Scottish Index of Multiple Deprivation.