showed a trendP = 0.109
In the results of this study, although no statistical differences were shown, workers with single exposure to noise still showed a trend toward an increased risk of developing hypertension (OR, 1.79; 95% CI, 0.88–3.65; P = 0.109) after adjusting for age, sex, and BMI in model 3, which are confounding factors that may affect the results.