International Journal of Epidemiology 2001;30:809-817
© International Epidemiological Association 2001
Cancer |
Socioeconomic status and lung cancer risk in Canada
a Cancer Bureau, Laboratory Centre for Disease Control, Health Canada, Ottawa, Canada.
b Alberta Cancer Board, Department of Epidemiology, Prevention & Screening, Canada.
Abstract
Background Several epidemiological studies have found that lung cancer is inversely related to socioeconomic status (SES) and suggest it as a possible risk factor for lung cancer. This study examines SES and lung cancer risk in Canada.
Methods Mailed questionnaires with telephone follow-up were used to obtain data on 3280 newly diagnosed, histologically confirmed lung cancer cases and 5073 population controls, between 1994 and 1997, in eight Canadian provinces. Measurement included information on SES, smoking habits, alcohol use, diet, residential and occupational histories and both residential and occupational exposure to environmental tobacco smoke (ETS). Odds ratios (OR) and 95% CI were derived from unconditional logistic regression analysis.
Results Compared with high income adequacy, an increased risk was found among low income males and females, with adjusted OR of 1.7 (95% CI : 1.3–2.2) and 1.5 (95% CI : 1.1–2.0), respectively. Compared with 
8 years of education, the adjusted OR were 0.6 (95% CI : 0.5–0.7) and 0.6 (95% CI : 0.5–0.8) for 
14 years education among males and females, respectively. Lung cancer risk was significantly increased for males of some social classes. The population attributable risk for income adequacy, education and social class was 24%, 25% and 21% among males, respectively, and 14% and 19% for income adequacy and education among females, respectively, in this Canadian population.
Conclusions A statistically significant association between income adequacy, education social class and lung cancer risk was found.
Keywords Socioeconomic status, lung cancer, income, education, social class, odds ratio
Accepted 27 July 2000
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