Internal consistency for KOOS subscales
| KOOS subscale | Number of items | Average interitem covariance | Cronbach’s α |
| KOOS-PF | 11 | 0.50 | 0.86 |
| KOOS-Pain | 9 | 0.35 | 0.85 |
| KOOS-Symptoms | 7 | 0.22 | 0.64 |
| KOOS-ADL | 17 | 0.36 | 0.94 |
| KOOS-Sport/Rec | 5 | 1.18 | 0.88 |
| KOOS-QOL | 4 | 0.37 | 0.75 |
ADL, Activities of Daily Living; KOOS, Knee injury and Osteoarthritis Outcome Score; KOOS-PF, Patellofemoral pain and osteoarthritis subscale; QOL, Quality of Life; Sport /Rec, Function in sport and recreation.