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Table 4 Odds ratios for association between cumulative exposure to cotton and wool dust, and lung cancer in two case-control studies in Montreal, Canada

From: Lack of a protective effect of cotton dust on risk of lung cancer: evidence from two population-based case-control studies

Exposure group

Study 1

Study 2

Pooled

 

Population controls

Cancer controls

All controls, weighted

Males

Females

Population controls

na

ORb(95% CI)

OR (95% CI)

OR (95% CI)

n

OR (95% CI)

n

OR (95% CI)

n

OR (95% CI)

Cotton dust

          

  Ever exposure

66

1.4 (0.9-2.3)

1.0 (0.7-1.4)

1.2 (0.8-1.7)

108

1.4 (1.0-2.0)

131

1.0 (0.7-1.5)

305

1.2 (1.0-1.5)

Substantial exposure

30

1.5 (0.7-3.3)

0.8 (0.5-1.3)

1.0 (0.6-1.8)

14

1.1 (0.5-2.5)

5

1.0 (0.2-4.5)

49

1.2 (0.7-2.0)

Wool dust

          

  Ever exposure

42

1.2 (0.7-2.3)

0.8 (0.5-1.3)

1.0 (0.6-1.6)

46

0.9 (0.6-1.4)

47

1.2 (0.7-2.0)

135

1.0 (0.8-1.4)

Substantial exposure

22

1.3 (0.6-3.0)

0.7 (0.4-1.2)

0.9 (0.5-1.7)

8

1.5 (0.5-4.5)

6

7.6 (0.5-107.9)

36

1.5 (0.8-2.8)

  1. a n = number of exposed cases.
  2. b OR refers to odds ratio, adjusted for: age, ethnicity (French Canadian or other), years of education (0-7, 8-12 or 13+), familial financial situation during childhood (difficult, intermediate or comfortable), proxy respondent (yes or no), cumulative smoking index, and any occupational exposure to asbestos, chromium, nickel or silica. Pooled results are additionally adjusted for study.
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BMC Cancer

ISSN: 1471-2407

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