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Types of surgical procedures
| Type of surgery | Midazolam group | Fentanyl group | Totals |
| Knee arthroscopy | 8(40%) | 5(25%) | 13(32.5%) |
| Knee replacement | 4(20%) | 3(15%) | 7(17.5%) |
| Hip replacement | 0 | 3(15%) | 3(7.5%) |
| ORIF femur | 3(15%) | 3(15%) | 6(15%) |
| ORIF Tibia | 1(5%) | 1(5%) | 2(5%) |
| ORIF ankle | 3(15%) | 5(25%) | 8(20%) |
| Above knee amputation |
1(5%) | 0 | 5(2.5%) |
| Total | 20 | 20 | 40(100%) |
