The value of three visual analogue scales for measuring aspects of functional capacity was assessed in 22 patients with rheumatoid arthritis receiving long-term treatment. A scale in which patients were allowed to choose a function which was a particular problem gave the best results, with more severe initial impairment and greater change with treatment. This scale was as useful as pain in assessing the result of treatment.
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Scott et al. (1977) studied this question.
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