Fig. 4

Representation of p-values of the AUC in comparison (upper triangular matrix; n.s.: not significant), the absolute AUC values (main diagonal, values marked in bold), and the absolute difference of the AUC values (color representation depending on the magnitude of absolute difference); Note: An AUC value of 1 corresponds to a 100% ability of the parameter to distinguish between normal foot and flatfoot, an AUC value of 0.5 indicates a 50% probability. Representation after DeLong [12]. TC-lat: Talocalcaneal angle (lateral-view), Calc-P: Calcaneal-pitch angle, Costa-B: Costa-Bartani angle, TMTI-lat: Talo-first-metatarsal angle (lateral-view), TMTIB: Talo-first-metatarsal-base angle, TNC: Talonavicular coverage, Calc-MTV: Calcaneus-fifth-metatarsal angle, TC-dp: Talocalcaneal angle (dorsoplantar-view), TMTI-dp: Talo-first-metatarsal angle (dorsoplantar-view), TMTInd: Talometatarsal index, TCInd: Talocalcaneal index