Comparison of Logistic Regression Models with and without genotype for 4 SNPs in ERCC4.

aNumber of variables in the logistic regression model.b−2Log likelihood value for the logistic regression model.cLikelihood ratio test for evaluating the fit of the model.dDifference in the number of variables when comparing two models.eP value for the likelihood ratio test to compare two models.fModel with constant only.gModel with constant and covariates such as age, sex, smoking status and alcohol status.