Adjusted odds ratios (ORs) (AORs) and 95% confidence intervals (CIs) of oral cancer associated with CA9 genotypic frequencies and betel-nut chewing among 598 smokers.

The ORs with their 95% CIs were estimated by logistic regression models. The AORs with their 95% CIs were estimated by multiple logistic regression models after controlling for age, gender, and alcohol consumption.aIndividuals with the wild genotype but without betel-nut chewing.bIndividuals with either at least 1 mutated genotype or betel-nut chewing.cIndividuals with both at least 1 mutated genotype and betel-nut chewing.*Statistically significant at p