EPHX1 and chronic obstructive pulmonary disease: Results showed that EPHX1 rs2234922 [dominant model (OR = 0.912, 95% CI = 0.836–0.994, PZ = 0.037) and allele model (OR = 0.922, 95% CI = 0.857–0.933, PZ = 0.032)] were associated with a lower risk of COPD, consistent with findings from the overall analysis, and indicating that some studies with PHWE <0.05 did not affect the overall results, which were reliable.