PT - JOURNAL ARTICLE AU - Michael M. Ward AU - Isabel Castrejon AU - Martin J. Bergman AU - Maria I. Alba AU - Lori C. Guthrie AU - Theodore Pincus TI - Minimal Clinically Important Improvement of Routine Assessment of Patient Index Data 3 in Rheumatoid Arthritis AID - 10.3899/jrheum.180153 DP - 2019 Jan 01 TA - The Journal of Rheumatology PG - 27--30 VI - 46 IP - 1 4099 - http://www.jrheum.org/content/46/1/27.short 4100 - http://www.jrheum.org/content/46/1/27.full SO - J Rheumatol2019 Jan 01; 46 AB - Objective. To estimate minimal clinically important improvement (MCII) of RAPID-3 (Routine Assessment of Patient Index Data 3) in rheumatoid arthritis (RA).Methods. RAPID-3 was computed before and after treatment escalation in a prospective study of adults with active RA. Patient judgment of improvement was used as the standard for a receiver-operating characteristic curve, from which MCII was estimated.Results. Mean RAPID-3 improved from 16.3 to 11.1 between visits. MCII was −3.8 based on simultaneously optimized sensitivity and specificity, −3.5 using the 0.80 specificity criterion, and −4.1 using the Youden index.Conclusion. RAPID-3 improvement of 3.8/30 units appears clinically meaningful.