| N | Minimum | Maximum | Mean | Standard deviation | Variance |
Index | 92 | 0.20 | 0.36 | 0.2693 | 0.03761 | 0.001 |
Medial slope (˚) | 92 | −3.5 | 9.9 | 4.517 | 1.8276 | 3.340 |
Lateral slope (˚) | 92 | −6.2 | 7.6 | 3.368 | 2.4882 | 6.191 |