Further Clinical Validation of the Walking Impairment Questionnaire for Classification of Walking Performance in Patients with Peripheral Artery Disease
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.
