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Table 2 Comparative fit of multivariate models containing different rheumatology function tests.

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

  Rheumatology function test scale included as independent variable in multivariate modela
  Primary RFT scale  
Dependent variable Grip strength Walking velocity Button speed Derived global physical functionb
Currently working -4430 -4455 -4438 -4462***
Currently disabled -4260 -4283 -4283 -4298***
Death within 6 years -4673 -4677 -4679 -4689***
Pain -159 -171 -156 -170**
Tender-joint count 828 894 907 824**
Swollen-joint count -69 -9 7 -37**
Deformed-joint count 556 620 571 535***
MHAQ scale -3788 -3880 -3816 -4002***
SF36PF scale -253 -695 -549 -763***
Steinbrocker functional class -3564 -3707 -3633 -3787***
Latent disability scale -3277 -3481 -3334 -3635***
  1. Values shown are Bayesian information criteria. aModel's form was y = age + sex + physical disability scale, where y = dependent variable. For current working, currently disabled and death by 6 years, the model was logistic; for other variables, model was ordinary least squares. bExtracted from a principal component factor analysis of grip strength, walking velocity, and button speed (see Fig. 1). **Strong or very strong support in favor of model that includes the latent variable, over two of the primary tests. ***Strong or very strong support in favor of model that includes the latent variable, over three of the primary tests. MHAQ, Modified Health Assessment Questionnaire; RFT, rheumatology function test; SF36PF, short-form 36 physical function scale.