 
Father

Mother

pvalue


Smoking Prevalence

Current smoker
 
51.9 (726)^{1}

36.1 (510)
 
Non smoker

30.8 (431)

52.2 (737)

< 0.001

Ex smoker

17.2 (241)

11.6 (164)
 
Years

Current smoker

18 ± 6 ^{2}

12 ± 5

< 0.001

Ex smoker

14 ± 8

9 ± 6

< 0.001

Quantity (cigarettes/day)

Current smoker

23 ± 12 ^{2}

15 ± 9

< 0.001

Ex smoker

22 ± 15

12 ± 9

< 0.001

Parental Smoking

Both smokers

25.5 (356) ^{3}

One smoker

37.3 (521)

Both non smokers

37.2 (519)

 
Father
 
 
Smoker

Ex/Non smoker

pvalue

Mother

Smoker

25.5 (356) ^{4}

11.0 (153)

< 0.001


Ex/Non smoker

26.4 (368)

37.2 (519)
 
 1. The values are given as % (N = individuals) [Chisquare test (χ^{2})]
 2. The values are given as: mean ± standard deviation [Student t test – equal variances not assumed]
 3. The values are given as % (N = families)
 4. The values are given as total % (N = families) [Chisquare test (χ^{2})]