Minimal Clinically Important Improvement of Routine Assessment of Patient Index Data 3 in Rheumatoid Arthritis.

Ward, Michael M; Castrejon, Isabel; Bergman, Martin J; Alba, Maria I; Guthrie, Lori C; Pincus, Theodore · J Rheumatol · 2019

prospective_cohort · Level II

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Abstract

To estimate minimal clinically important improvement (MCII) of RAPID-3 (Routine Assessment of Patient Index Data 3) in rheumatoid arthritis (RA). 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. 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. RAPID-3 improvement of 3.8/30 units appears clinically meaningful.

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