| Age group | Knee score difference. Mean | SD | F-statistics | P-Value |
| <20 | 44.9 | 13.3 | 0.271 | 0.846 |
| 20 - 29 | 42.3 | 12.2 |
|
|
| 30 - 39 | 39.3 | 12.5 |
|
|
| ≥40 | 40.5 | 13.1 |
|
|
| Sex |
|
| −0.481 | 0.634 |
| Male | 39.9 | 14.3 |
|
|
| Female | 42.1 | 9.8 |
|
|