Statistical methods
REGRESSION
The data were analyzed and processed using SPSS 25.0 statistical software. The baseline characteristics of the two groups were compared by mean ± standard deviation (± s), independent sample t-test and chi-square test. The χ2 test was used to analyze whether the genotype distribution conformed to the Hardy-Weinberg genetic balance law. The χ2 test was used for univariate analysis, Fisher’s exact test was used when the theoretical frequency was less than 5. Multivariate analysis was performed using binary logistic regression. P < 0.05 means the difference is statistically significant.