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Table 5 Diagnostic performance among age and Fabellar parameters a

From: The prevalence and parameters of fabella and its association with medial meniscal tear in China: a retrospective study of 1011 knees

  Length Width Length/Thickness Width/Thickness Age Combinationb
Sensitivity 0.664 0.418 0.648 0.705 0.779 0.730
Specificity 0.536 0.739 0.704 0.641 0.707 0.746
Accuracy 0.559 0.681 0.694 0.653 0.748 0.741
DOR 2.280 2.037 4.361 4.507 8.496 7.939
AUC 0.619 0.604 0.706 0.688 0.766 0.791
AUC: 95% CI 0.559–0.679 0.544–0.664 0.649–0.763 0.633–0.744 0.716–0.816 0.744–0.837
P for AUC = 0.5c 0.001 0.012  < 0.001  < 0.001  < 0.001  < 0.001
P for AUC = Combinationd  < 0.001  < 0.001 0.024 0.005 0.473 n/a
  1. aDFI distance between the fabella and the insertion of the lateral head of the gastrocnemius onto the femur, DOR diagnostic odds ratio, AUC area under curve, CI confidence interval, n/a not applicable. bCombination = Width + Length/Thickness + Age, Logistic regression: Backward. cP value of each AUC tested against 0.5; binomial z test. dP value of each AUC tested against the AUC of combination; binomial z test