| Creatinine clearance (ml/min) | Numbers | Frequencies |
| Advanced chronic renal failure (10 - 15) | 3 | 2.3 |
| Severe chronic renal failure (15 - 30) | 2 | 1.5 |
| Moderate chronic renal failure (30 - 60) | 4 | 3.0 |
| Mild chronic renal failure (60 - 100) | 22 | 16.7 |
| Normal Renal function (>100) | 101 | 76.5 |
| Total | 132 | 100 |