| Variables | Study group (n = 55) | |
| No | % | |
| Gender Male Female |
33 22 |
60.0% 40.0% |
| Age/years <30 y 30 - 40 y >40 y |
21 20 14 |
38.2% 36.4% 25.4% |
| Mean ± SD Min - Max | 33.27 ± 7.49 21.00 - 47.00 | |
| Smoking yes No |
9 46 |
16.4% 83.6% |