The ability of an instrument (methods, questionnaire etc.) to measure a significant change in disease-activity over time. The ACR and the EULAR recommend different response criteria (or improvement criteria). Their criteria have comparable validity in RA. See also: Anke M. van Gestel et al. “ACR and Eular improvement criteria have comparable validity in RA trials”, J. Rheumatol 1999;26:3:705-711.
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