Further Clinical Validation of the Walking Impairment Questionnaire for Classification of Walking Performance in Patients with Peripheral Artery Disease
Table 5
Cut-offs for the WIQ subscores and combined scores for various sensitivities and specificities as well as the area under the curve of the ROC for identifying those in the high walking ability 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
30.5
0.63
19.0
0.42
44.0
0.66
62.0
0.45
0.80 (0.72–0.89)
Speed
39.0
0.55
31.5
0.44
57.5
0.49
83.0
0.26
0.74 (0.65–0.83)
Stair
54.0
0.51
41.5
0.36
67.0
0.60
87.5
0.23
0.76 (0.66–0.85)
Distance and speed
36.0
0.63
28.0
0.44
53.0
0.50
64.0
0.47
0.78 (0.70–0.87)
Distance and stair
47.0
0.68
38.0
0.56
58.0
0.62
75.5
0.41
0.81 (0.73 –0.90)
Speed and stair
48.0
0.61
36.0
0.38
64.0
0.57
75.0
0.46
0.78 (0.69–0.88)
Overall
44.0
0.67
34.0
0.47
61.0
0.53
69.5
0.47
0.80 (0.72–0.89)
ROC: receiver operating characteristics. CI: confidence interval. The bold score has the highest area under the curve of the ROC.
