Table 1. Demographic characteristics of the study population.
| Number of plants | 36 | |||
| Number of subjects | 678 | |||
| Working duration (yr)1 | 12.4 ± 9.4 | |||
| Age (yr)1 | 43.1 ± 11.1 | |||
| Percent body fat (%)1 | 22.9 ± 61 | |||
| Body mass index1 | 24.0 ± 3.3 | |||
| Smoking habit | n | Ratio | ||
| Nonsmoker | 121 | 17.8% | ||
| Smoker | 556 | 82.0% | ||
| Ex-smoker | 165 | 24.3% | ||
| Current smoker | 390 | 57.5% | ||
| Unknown | 1 | 0.1% | ||
| Alcohol consumption | n | Ratio | ||
| Nondrinker | 126 | 18.6% | ||
| Drinker | 551 | 81.3% | ||
| 2–3 times/month | 96 | 14.2% | ||
| 2–3 times/wk | 220 | 32.4% | ||
| Everyday | 225 | 33.2% | ||
| Unknown | 10 | 1.5% | ||
| Job categories2 | n | Ratio | ||
| I | 39 | 5.8% | ||
| II | 11 | 1.6% | ||
| III | 70 | 10.3% | ||
| IV | 550 | 81.1% | ||
| Unknown | 8 | 1.2% | ||
| Personal protective equipment | n | Rate | ||
| Respirators | 625 | 92.2% | ||
| Goggles | 413 | 60.9% | ||
| Gloves | 480 | 70.8% | ||
| Number of diseases | n | Rate | ||
| Hypertension | 304 | 44.8% | ||
| Diabetes mellitus | 45 | 6.6% | ||
| Hyperlipidemia | 362 | 53.4% | ||
| Liver dysfunction | 211 | 31.1% | ||
1The values represent arithmetic means ± SD. 2Job categories I to IV are described in Subjects and Methods.