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Table 4 Area under the receiver operating characteristics curve and minimal important change for the physical capacity tasks

From: One-minute stair climbing, 50-foot walk, and timed up-and-go were responsive measures for patients with chronic low back pain undergoing lumbar fusion surgery

Physical capacity tasks

5-min walk

1-min stair climbing

50-ft walk

Timed up-and-go GPEwalking

Timed up-and-go GPEchair rise

AUCConstruct-specific GPE (95% CI)

0.68 (0.54 to 0.82)

0.72 (0.59 to 0.85)

0.80 (0.67 to 0.93)

0.74 (0.61 to 0.86)

0.79 (0.67 to 0.91)

AUCGeneric GPE (95% CI)

0.70 (0.58 to 0.82)

0.70 (0.59 to 0.81)

0.76 (0.66 to 0.87)

0.72 (0.67 to 0.91)

0.72 (0.62 to 0.83)

Correlation between change score and construct-specific GPE

0.39

0.50

−0.57

−0.48

− 0.53

MICabsolute (95% CI)

45.5 m (8.5 to 62.0)

20.0 steps (10.5 to 48.0)

−0.6 s (− 0.7 to − 0.2)

−1.3 s (−2.4 to − 0.5)

−1.3 s (− 2.4 to − 0.3)

 Sensitivity for MICabsolute

0.63

0.63

0.73

0.67

0.73

 Specificity for MICabsolute

0.75

0.76

0.83

0.71

0.79

Average absolute change from baseline of the physical capacity tasks, mean (SD)

62.5 m (69.5)

22 steps (22.4)

−1.3 s (2.5)

−2.0 s (2.9)

−2.0 s (2.9)

MICrelative (95% CI)

9.0% (4.5 to 11.8)

12.5% (7.2 to 48.4)

−6.1% (−7.1 to −3.4)

−17.3% (−29.4 to − 10.2)

− 17.6% (− 20.7 to − 10.2)

 Sensitivity for MICrelative

0.69

0.70

0.76

0.73

0.79

 Specificity for MICrelative

0.75

0.72

0.88

0.71

0.79

  1. AUC Area under the receiver operating characteristics curve, CI Confidence interval, GPE Global Perceived Effect scale, MIC Minimal important change