Skip to main content

Table 4 Odds ratios between smoking and brain tumour by sex, ever regular smoking, smoking duration and pack-years

From: Brain tumours and cigarette smoking: analysis of the INTERPHONE Canada case–control study

Sex/smoking stratum

Glioma

Meningioma

 

Ca/Co

OR (95% CI)

Ca/Co

OR (95% CI)

Males and females combined

    

Never regular smokers

78/311

1

42/311

1

Ever regular smokers

88/337

0.96 (0.67-1.38)

51/337

1.09 (0.69-1.72)

>0 to <20 years

51/177

1.05 (0.70-15.96)

25/177

1.10 (0.64-1.89)

≥ 20 years

37/160

0.84 (0.53-1.34)

26/160

1.08 (0.62-1.88)

>0 to <15 pack-years

43/173

0.97 (0.63-1.49)

22/173

0.93 (0.53-1.62)

≥15 pack-years

45/164

0.95 (0.61-1.48)

29/164

1.28 (0.75-2.20)

Males only

    

Never regular smokers

41/140

1

9/140

1

Ever regular smokers

64/177

1.28 (0.82-2.02)

17/177

1.34 (0.57-3.17)

>0 to <20 years

37/88

1.36 (0.80-2.30)

16/89

1.47 (0.56-3.90)

≥ 20 years

27/89

1.02 (0.57-1.82)

18/71

1.21 (0.44-3.36)

>0 to <15 pack-years

30/75

1.32 (0.75-2.30)

17/98

1.00 (0.32-3.11)

≥15 pack-years

34/102

1.10 (0.63-1.89)

17/62

1.61 (0.63-4.13)

Females only

    

Never regular smokers

37/171

1

33/171

1

Ever regular smokers

24/160

0.73 (0.41-1.28)

34/160

0.98 (0.57-1.68)

>0 to <20 years

14/89

0.78 (0.40-1.53)

9/88

0.99 (0.51-1.92)

≥ 20 years

10/71

0.66 (0.31-1.42)

8/89

0.98 (0.50-1.89)

>0 to <15 pack-years

13/98

0.68 (0.34-1.36)

5/75

0.93 (0.48-1.78)

≥15 pack-years

11/62

0.78 (0.37-1.65)

12/102

1.05 (0.53-2.08)

  1. Three models were estimated: one model with ever regular smoking as a binary variable and one each with three categorical levels of duration and pack-years of smoking. The reference groups in all comparisons are never regular smokers. Analyses were adjusted for age (decades); sex (in the analysis of males and females combined); education level (low, high); and region (Montreal, Ottawa, Vancouver). Covariates were removed from the model if they were non-significant and did not change any of the smoking ORs by more than 10%.