| Duration of hospitalization (days) | Effective | Percentage |
| 1 - 5 | 4 | 12.90 |
| 6 - 10 | 8 | 25.80 |
| 11 - 15 | 6 | 19.35 |
| 16 - 20 | 1 | 3.23 |
| 21 - 25 | 3 | 9.67 |
| 26 - 30 | 5 | 16.12 |
| 31 - 35 | 4 | 12.90 |
| Total | 31 | 100 |