| The characteristics | Healthy control | Type 2 DM. | |
| Total (No.) | 50 | 50 | |
| Age (mean ± SD) | 51.66 ± 7.72 | 52.37± 6.46 | |
| Sex | Male | 25 | 26 |
| Female | 25 | 24 | |
| DM. duration (mean ± SD) | ≤10 |
| 32 |
| >10 | 18 | ||
| Smoking habit | Negative | 26 | 49 |
| Positive | 4 | 1 | |