Table 2. Demographic characteristics and risk factors for hypertension in the noise-exposed and control groups.
| Characteristic | Control (N=378) |
Noise-exposed (N=360) |
P Value | |||||
|---|---|---|---|---|---|---|---|---|
| Mean (SD) | No. | % | Mean (SD) | No. | % | |||
| Age (years) | 42.83 (6.91) | 43.45 (6.38) | 0.209a | |||||
| Male | 249 | 65.9 | 245 | 68.1 | 0.529b | |||
| Female | 129 | 34.1 | 115 | 31.9 | ||||
| Body mass index (kg/m2) | 23.57 (3.00) | 23.78 (2.84) | 0.222a | |||||
| Length of service (years) | 21.96 (7.16) | 22.95 (6.65) | 0.052a | |||||
| TC (mg/dL) | 5.01 (0.96) | 4.98 (0.93) | 0.640a | |||||
| TG (mg/dL) | 1.57 (1.61) | 1.53 (1.15) | 0.700 a | |||||
| HDL (mg/dL) | 1.32 (0.38) | 1.30 (0.30) | 0.244 a | |||||
| LDL (mg/dL) | 3.23 (0.77) | 3.17 (0.81) | 0.317 a | |||||
| Smoking | 138 | 36.5 | 117 | 32.5 | 0.252b | |||
| Alcohol consumption | 88 | 23.3 | 71 | 19.7 | 0.240b | |||
| Family history of CVD | 137 | 36.2 | 126 | 35.0 | 0.724b | |||
SD, standard deviation; CVD, cardiovascular disease; TC, total cholesterol; TG, triglyceride; HDL, high-density lipoprotein; LDL, low-density lipoprotein. a, two-sided t-test of the continuous variable difference between the noise-exposed group and the control group; b, two-sided χ2 test for the frequency difference between the two groups.