Table 1. Demographic Characteristics of Subjects by Exposure [M(P25, P75)or N(%)].
| Grouping | Exposed | Unexposed | ||
| Males | Females | Males | Females | |
| Number | 576(81.7)** | 129(18.3)** | 43(65.2) | 23(34.8) |
| Age (years) | 32.0(23.0, 39.0) | 38.0(34.0, 41.0)** | 26.5(24.0, 41.5) | 26.0(23.0, 39.0) |
| Exposed/unexposed work duration (years) exposure | 2.6(1.6, 18.2) | 18.0(12.0, 21.0)* | 2.0(1.6, 2.8) | 2.6(2.4, 21.0) |
| Education (≥high school) | 79(14.3)** | 11(8.8)** | 28(68.3) | 15(65.2) |
| Married | 377(67.2) | 109(87.2)** | 23(54.8) | 14(60.9) |
| Smoker | 351(62.9) | 0(0.0) | 24(58.5) | 0(0.0) |
| Drinker | 320(57.7)* | 1(0.8) | 31(75.6) | 0(0.0) |
*(**) p<0.05 (0.01) (Chi-square test or nonparametric test) compared with the unexposed group of the same sex.
Results were expressed as the mean ± SD when the continuous variables followed a normal distribution.
Results were expressed as M (P25, P75) when the continuous variables did not follow a normal distribution.