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Table 1 Anchor-based calculations of MID for the VAS and the FHSQ

From: Minimal Important Difference (MID) of two commonly used outcome measures for foot problems

Outcome

Domain

0 to +1

+2 to +3

MID values

95% CI

Measure

 

n = 57

n = 40

  

VAS

Average

-1.1§

-8.9

-7.8

-11.7 to -3.9

 

1st Step

-1.9

-20.5

-18.6

-24.6 to -12.6

FHSQ

Pain

8.7

21.2

12.5

5.8 to 19.2

 

Function

4.8

11.9

7.1

0.7 to 13.4

 

Footwear

1.9

-0.2

-2.1

-8.0 to 3.8

 

GFH

8.3

7.9

-0.4

-7.1 to 6.4

  1. Abbreviations: VAS = Visual Analogue Scale, FHSQ = Foot Health Status Questionnaire, MID = Minimal Important Difference, GFH = General Foot Health, CI = Confidence Interval.
  2. Note: Three variables were initially not normally distributed, so outliers that were 3SDs from the mean were removed to ensure normalcy. Accordingly, some variables had a lower sample size due to this, which the following symbols represent: §n = 55, n = 56, n = 39.