Adjusted odds ratios (ORs) (AORs) and 95% confidence interval (CIs) of oral cancer associated with <i>CA9</i> genotypic frequencies and smokers among 444 betel-nut consumers.

<p>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.</p>a<p>Individuals with the wild-type genotype but without smoking.</p>b<p>Individuals with either at least 1 mutated genotype or smoking.</p>c<p>Individuals with both at least 1 mutated genotype and smoking.</p>*<p>Statistically significant at <i>p</i><0.05.