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Characteristics of exposed groups and control.
| EXP1 | EXP2 | Control | |
|---|---|---|---|
| Number | 72 | 76 | 76 |
| Age (years±S.D.) | 41.19±8.95 | 36.89±8.75 | 35.99±7.73 |
| Exposure (years±S.D.) | 11.31±8.98 | 11.75±9.35 | |
| Sex (N) M/F | 7 / 65 | 15 / 61 | 16 / 60 |
| Smoking (N) S/NS | 19 / 53 | 23 / 53 | 15 / 61 |
| Job (N) physician/nurse | 14 / 58 | 41 / 35 | 20 / 56 |
