Characteristics of the participating factory workers by exposure group
| Exposure group | |||
|---|---|---|---|
| High | Moderate | Low | |
| Number (%) | 323 (64.6) | 114 (22.8) | 63 (12.6) |
| Age (y, mean (SD)) | 24.3 (7.5) | 24.7 (7.3) | 27.4 (9.4) |
| Female | 310 (96.0) | 79 (69.3) | 43 (68.3) |
| Duration of exposure (y, mean (SD)) | 2.04 (2.3) | 1.9 (2.3) | 2.2 (2.6) |
| Smoking (n (%)) | |||
| Current smoker | 36 (11.1) | 31 (27.2) | 28 (44.4) |
| Ex-smoker | 2 (0.6) | 3 (2.6) | 1 (1.6) |
| Non-smoker | 285 (88.2) | 80 (70.2) | 34 (54.0) |
| Atopy (skin prick test, n (%)) | 84 (26.0) | 29 (25.4) | 25 (39.7) |