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Table 5 Standard error of measurement (SEM) and minimum detectable change (MDC) from the FFI scores

From: Validity and reliability of the Foot Function Index (FFI) questionnaire Brazilian-Portuguese version

Scores (n = 50)

Inter-observera

Intra-observerb

SEM

SEM

MDC (90 % CI)

FFI Total

1.32

1.08

2.42

Disability

1.77

2.15

3.43

Activity limitation

2.16

1.56

2.91

Pain

2.03

1.82

3.15

  1. FFI Foot Function Index, n volunteer number, SEM standard error of measurement, MDC minimal detectable change, CI confidence interval
  2. aSEM of inter-observer; bSEM and MDC of intra-observer after maximum interval of two weeks
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