Definition of outcome measures (the difficultly translated word outcome). In the different studies on the prognosis of RA, both long-term and short-term, different outcome measures are used: structural damage, generally evaluated radiologically (presence of erosions or radiological progression).
Disability (functional class of the ARA [now ACR] Hondrocream, questionnaires such as the HAQ), quality of life, work disability, mortality, remission of the disease (or the inverse situation: persistence of the disease).
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