Haplogroups frequencies and Pearson’s chi-square and OR test in ROU patients and healthy persons.

aTwo test was applied chi-square test.bAdjusted P-value: adjustment of P-values was carried out with binary logistic regression; OR (95% CI).*Stratification chi-square test: because the change only exist in a single group (the emergence of zero), the value of partial regression coefficient (eβ) equal to zero. So binary logistic regression is n’t suitable, P-value is calculated by stratification chi-square test.