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Table 4 Area under the ROC curve based on the radiographic degrees of Kellgren and Lawrence ≥ 1 and ≥ 2

From: Knee osteoarthritis pre-screening questionnaire (KOPS): cross-cultural adaptation and measurement properties of the brazilian version—KOPS Brazilian version

Variable

KL ≥ 1

KL ≥ 2

Area under the ROC curve

0.740

0.774

Standard error

0.065

0.037

95% Confidence interval

0.674 to 0.799

0.709 to 0.830

Z-statistic

3.645

7.393

Significance level

< 0.001

< 0.001

Sensitivity

78.38

80.54

Specificity

60.00

60.78

  1. KL: Kellgren and Lawrence