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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.