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Table 2 Logit scores and back-transformed FPI-6 raw scores for the normal adult population.

From: Normative values for the Foot Posture Index

  Pathological Potentially abnormal Normal range Potentially abnormal Pathological
  < -2 SD -2 SD -1 SD Mean +1 SD +2 SD > +2 SD
FPI logit   -2.2 +0.1 +2.4 +4.7 +7.0  
FPI raw score < -3 -3 +1 +4 +7 +10 > +10