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General characteristics of the coke oven workers and control group
| Items | Exposed Group (n=880) | Control (n=710) | P Value |
|---|---|---|---|
| Gender (male/female) | 648/232 | 489/221 | 0.721 |
| Age (means±SD) | 39.1±11.32 | 38.06±11.54 | 0.071 |
| Service years (means±SD) | 9.52±1.74 | 9.73±2.27 | 0.079 |
| Smoking (Yes/No) | 517/363 | 426/284 | 0.633 |
| Drinking (Yes/No) | 650/230 | 328/382 | 0.714 |
