Table 1.
General characteristics of the participants.
| Characteristics | Exposed Group (n = 140) | Control Group (n = 140) | t or χ 2 | p |
|---|---|---|---|---|
| Age (years) | 32.40 ± 7.53 | 31.21 ± 6.83 | 1.385 | 0.167 |
| Working age (years) | 2.28 ± 0.50 | 2.18 ± 0.96 | 1.093 | 0.275 |
| Sex (n, %) | ||||
| Male | 121 (86.4) | 110 (78.6) | 2.993 | 0.084 |
| Female | 19 (13.6) | 30 (21.4) | 1.088 | 0.278 |
| Weight (kg) | 66.65 ± 6.42 | 65.83 ± 6.19 | 1.723 | 0.086 |
| Height (cm) | 168.35 ± 7.29 | 166.74 ± 8.31 | 0.988 | 0.324 |
| BMI (kg/m2) | 24.04 ± 3.39 | 23.63 ± 3.55 | 3.527 | 0.060 |
| Smoking (n, %) | 68 (48.6) | 52 (37.1) | 25.35 | <0.001 |
| PM2.5 concentration of 8-h TWA in the working places (mg/m3) | 1.28 ± 0.36 | 0.46 ± 0.13 |
BMI: body mass index; 8-h TWA: eight-hour time-weighted average concentration.