| Factor | N | Minimum | Maximum | Mean | Std. Deviation |
| Age of patients | 81 | 15 | 78 | 45.4 | 14.7 |
| Height of patients | 81 | 148 | 187 | 164.2 | 8.5 |
| Weight of patients | 81 | 42 | 126 | 77.0 | 18.1 |