Table 2 Score distribution and floor-ceiling effects of the C-LKS
Item | Mean ± SD | Observed range | Theoretical range | Floor effect (%)a | Ceiling effect (%)a |
|---|---|---|---|---|---|
Overall scale | 58.14 ± 15.25 | 0–100 | 0–100 | 0.8 | 1.6 |
Limp | 3.27 ± 1.38 | 0–5 | 0–5 | 9.5 | 28.6 |
Locking | 11.30 ± 4.27 | 0–15 | 0–15 | 3.2 | 50.8 |
Pain | 13.13 ± 4.68 | 0–25 | 0–25 | 4.0 | 4.8 |
Stair climbing | 4.89 ± 3.46 | 0–10 | 0–10 | 11.1 | 23.0 |
Support | 3.98 ± 1.59 | 0–5 | 0–5 | 4.8 | 69.0 |
Instability | 13.53 ± 4.15 | 0–25 | 0–25 | 2.4 | 3.2 |
Swelling | 4.62 ± 3.05 | 0–10 | 0–10 | 8.7 | 14.3 |
Squatting | 3.52 ± 1.32 | 0–5 | 0–5 | 7.9 | 1.6 |