Factors | Effective group (n = 88) | Invalid group (n = 16) | P value | Unadjusted ORs | 95% CIs | P value |
---|---|---|---|---|---|---|
Age (y) | ||||||
≤ 70 | 78 (89) | 9 (56) | 0.001* | Ref |  |  |
> 70 | 10 (11) | 7 (44) |  | 6.607 | 1.851–19.882 | 0.003* |
BMI (kg/m2) | ||||||
≤ 30 | 67 (76) | 8 (50) | 0.032* | Ref |  |  |
> 30 | 21 (24) | 8 (50) |  | 3.190 | 1.067–9.544 | 0.038* |
K–L grade | ||||||
II–III | 79 (90) | 9 (56) | 0.001* | Ref |  |  |
IV | 9 (10) | 7 (44) |  | 6.827 | 2.047–22.772 | 0.002* |
Pre-HKAA (°) | ||||||
≤ 10 | 68 (77) | 8 (50) | 0.024* | Ref |  |  |
> 10 | 20 (23) | 8 (50) |  | 2.667 | 0.900–7.904 | 0.077* |