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Table 1 Revised criteria for functional status in RA (American College of Rheumatology) [6].

From: The pendulum test as a tool to evaluate passive knee stiffness and viscosity of patients with rheumatoid arthritis

Class Functional status
I Completely able to perform usual activities of daily living (self care, vocational and avocational)
II Able to perform usual self-care and vocational activities but limited in avocational activities
III Able to perform usual self-care activities but limited in vocational and avocational activities
IV Limited in ability to perform usual self-care, vocational and avocational activities
  1. Modified from Hochberg et al., 1991 [6]