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Participants in the nonsmoking and smoking groups.
| Group | Nonsmoking | Smoking |
|---|---|---|
| Number of participants | 26 | 19 |
| Average age | 38.12 ± 6.45 (years) | 37.68 ± 7.13 (years) |
| Average smoking period | 0 | 16.21 ± 6.04 (years) |
| Number of cigarettes daily | 0 | 17.95 ± 7.26 |
