a decreasing trendP < 0.001
The adjusted ORs showed a decreasing trend relative to the reference category (elementary school or below): 0.67 (95% CI: 0.56–0.79, P < 0.001) for middle school, 0.55 (95% CI: 0.43–0.71, P < 0.001) for high school, and 0.48 (95% CI: 0.23–0.99, P = 0.048) for college or above.