Statistical analysis
Statistical analysis was performed using SPSS 26.0 (International
Business Machine Corp, Armonk, NY, USA). The frequencies of genotypes,
alleles, and haplotypes between the two groups were analyzed by
χ2 or Fisher’s exact methods. Odds ratios (ORs) with
95% confidence intervals (CIs) were used to calculate the risk of
susceptibility. The Hardy–Weinberg equilibrium was determined to assess
the representativeness of the sample. P < 0.05 was considered
statistically significant.