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Table 5 Comparison of the Area Under the ROC Curve for Velocity field diagram and ‘Timed-Up-and-go test

From: Evaluating the discriminatory power of the velocity field diagram and timed-up-and-go test in determining the fall status of community-dwelling older adults: a cross-sectional observational study

tool

Sensitivity (% Fallers)

Specificity (%Nonfallers)

Overall Prediction

Area Under the ROC Curve

Comparison of the AUC to 0.5

AUC

SE

95% CI

Difference

z (Observed Value)

p

95% CI between AUC and 0.5 (Two-tailed test)

TUG

110/280 (39.28%)

130/220 (59.09%)

240/500 (48%)

0.53

0.09

[0.35, 0.70]

0.03

0.30

0.76

[0.147,0.20]

VFD

200/280 (71.42%)

60/220 (27.27%)

260/500 (52%)

0.74

0.07

[0.60, 0.88]

0.24

3.30

0.001*

[0.091,0.38]

  1. * indicates p ≤ 0.001; AUC = Area under the curve; SE = Standard error; 95% CI = 95% confidence interval; z (Critical value) = 1.96