highly significantP < 0.05
After adjustment for demographic and obstetric factors (Model 2: age, BMI, gravidity, parity), the association remained highly significant though slightly attenuated (pre‐PSM Q2–Q4 ORs: 1.21, 1.45, 1.70; post‐PSM: 1.20, 1.44, 1.69; all P < 0.05).