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