Stratification analysis of the association between number of risk genotypes and lung cancer risk by selected variables.

a<p>Compared with 0 risk genotype, ORs were adjusted for age, sex, smoking status, alcohol use, and family history of cancer in a logistic regression models.</p>b<p>Trend test for lung cancer risk, with number of risk genotypes in each stratum.</p>c<p>Interaction test P value.