The association results for rs4917 in two independent samples and the combined sample.

CI, confidence interval; BJ, Beijing; GZ, Guangzhou; HCW, health care workers.a. Case vs. Control. A combined group of the minor-allele homozygotes and heterozygotes was compared with the major-allele homozygotes group ((CT+TT) vs. CC); multivariate unconditional logistic regression was used.b. Case vs. Control. The frequency of the C allele was compared to the frequency of the T allele; the CMH test was used.