Adjusted odds ratio (AOR) and 95% confidence interval (CI) of oral cancer associated with CD44 genotypic frequencies and betel nut chewing among 731 smokers.

The odds ratios (ORs) with their 95% confidence intervals were estimated by logistic regression models.The adjusted odds ratios (AORs) with their 95% confidence intervals were estimated by multiple logistic regression models after controlling for age, gender and alcohol consumption.aIndividual with wild genotype but without betel nut chewing.bIndividual with either at least one mutated genotype or betel nut chewing.cIndividual with both at least one mutated genotype and betel nut chewing.