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Table 2 Concurrent validity between systems for each FPI item

From: Reliability and validity of the Microsoft Kinect for evaluating static foot posture

   Kinect-FPI ρ Kinect-Vicon ρ Vicon-FPI ρ
FPI item Instrumented item    
FPI 2 Lateral curve Lateral curve −0.03 0.85* −0.01
FPI 3 Calcaneal inv/eversion Calcaneal inv/eversion 0.36* 0.34 0.44*
FPI 4 TNJ bulging TNJ bulging −0.34 0.74* −0.35
FPI 5 Congruence of MLA Arch height −0.01 0.51* −0.20
  Arch peak −0.36 0.30 −0.44*
FPI 6 Forefoot ab/adduction Forefoot ab/adduction −0.14 0.57* −0.19
  1. Note: * p < 0.05; FPI = Foot Posture Index; ρ = Spearman’s rho; TNJ = talo-navicular joint; MLA = medial longitudinal arch.