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Table 3 Responsiveness to change of rheumatology function test (RFT) scales in 676 patients with rheumatoid arthritis

From: Measurement of global functional performance in patients with rheumatoid arthritis using rheumatology function tests

  

Primary RFT scales

 

Status at follow-up

n

Grip strength changea (kg) (mean ± SD)

Walking velocity changea (ft/min) (mean ± SD)

Button speed changea (buttons/min) (mean ± SD)

Global functional performance changea (mean ± SD)

Unimproved

440

0.42 ± 5.31

5.08 ± 59.73

0.16 ± 2.90

0.92 ± 8.72

Improved ACR20

117

-2.94 ± 5.84

-19.74 ± 51.98

-1.18 ± 3.26

-5.48 ± 9.91

Guyatt's ratiob

 

-0.55

-0.33

-0.40

-0.63

Improved ACR50

119

-4.54 ± 6.56

-30.30 ± 59.68

-1.54 ± 2.94

-7.86 ± 10.53

Guyatt's ratiob

 

-0.85

-0.51

-0.53

-0.90

  1. aChange = baseline measurement minus follow-up measurement. bGuyatt's ratio is the mean change among improved patients divided by the standard deviation of change among stable patients [26]. ACR20(50), American College of Rheumatology 20% (50%) response criteria; RFT, rheumatology function test.