| Duration of treatment I (Days) | Frequency | Percentage |
| 5 | 28 | 5.6 |
| 7 | 423 | 84.6 |
| 10 | 42 | 8.4 |
| 12 | 2 | 0.4 |
| 14 | 2 | 0.4 |
| 30 | 3 | 0.6 |
| Total | 500 | 100 |