Table 4.
Cut-offs for the WIQ subscores and combined scores for various sensitivity and specificities as well as the area under the curve of the ROC for identifying those in the low walking performance group.
| 0.8 sensitivity | 0.9 sensitivity | 0.8 specificity | 0.9 specificity | Area under the curve of the ROC (95% CI) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Cut-off | Specificity | Cut-off | Specificity | Cut-off | Sensitivity | Cut-off | Sensitivity | ||
| Distance | 28.5 | 0.73 | 38.5 | 0.57 | 25.0 | 0.73 | 15.5 | 0.62 | 0.83 (0.75–0.91) |
| Speed | 39.5 | 0.66 | 58.0 | 0.39 | 35.5 | 0.66 | 24.5 | 0.50 | 0.81(0.72–0.90) |
| Stair | 54.5 | 0.65 | 67.0 | 0.47 | 41.5 | 0.47 | 29.0 | 0.33 | 0.81 (0.73–0.89) |
| Distance and speed | 33.5 | 0.73 | 44.5 | 0.57 | 30.5 | 0.74 | 27.0 | 0.69 | 0.85 (0.77–0.93) |
| Distance and stair | 39.0 | 0.76 | 47.0 | 0.69 | 36.0 | 0.76 | 28.5 | 0.48 | 0.86 (0.79–0.93) |
| Speed and stair | 44.0 | 0.79 | 50.0 | 0.69 | 42.5 | 0.74 | 32.5 | 0.53 | 0.88 (0.81–0.94) |
| Overall | 39.0 | 0.77 | 42.5 | 0.73 | 35.0 | 0.72 | 32.5 | 0.66 | 0.89 (0.82–0.95) |
ROC: receiver operating characteristics.
CI: confidence interval.
The bold score has the highest area under the curve of the ROC.