Frequency distributions of <i>HNMT</i>, <i>HDC</i> and <i>HRH3</i> alleles and their associations with the risk of developing breast cancer.

OR odd ratio, CI confidence interval, Ref reference category. Bonferroni’s multiple adjustment was applied to the level of significance, which was set at P<0.01 (0.05/5 SNPs). aP values were calculated from two-sided chi-square tests or Fisher’s exact tests for either allele frequency. bP values were calculated by unconditional logistic regression adjusted for age, menopausal state and body mass index.