Lung cancer risk among workers in the construction industry: results from two case–control studies in Montreal

BMC Public Health

Table 4 Odds ratios between lung cancer and selected chemical agents in analyses restricted to construction workers, in the pooled set of studies, stratified by smoking status, and test for interaction

^aCriteria for selection of chemical agents: at least ten cases or ten controls with substantial exposure in the pooled studies; prevalence of exposure greater than 5 % among construction workers; and prevalence among controls at least twice as high in construction workers as in other workers
^bSubstantial exposure comprised subjects who had been exposed with a probable or definite reliability to medium or high concentrations for more than 5 % of their workweek and for at least 5 years
^cFor each chemical agent, the reference category consists of construction workers who were never exposed to the agent
^dNumber of cases/number of controls substantially exposed
^eOR Odds ratio adjusted for age, median family income for census tract, comprehensive smoking index, respondent status, education level and ethnicity and binary indicator for study
^f95 % confidence interval
^gSignificance of the interaction term between smoking (binary) and occupational exposure (1) ever vs never exposed or 2) not exposed/not substantially exposed/substantially exposed, in the regression models

ISSN: 1471-2458