PT - JOURNAL ARTICLE AU - MARIA-VICTORIA GOYCOCHEA-ROBLES AU - LUZ HELENA SANIN AU - JOSÉ MORENO-MONTOYA AU - JOSÉ ALVAREZ-NEMEGYEI AU - RUBÉN BURGOS-VARGAS AU - MARIO GARZA-ELIZONDO AU - JACQUELINE RODRÍGUEZ-AMADO AU - MARCO A. MADARIAGA AU - JORGE A. ZAMUDIO AU - GISELA ESPINOSA CUERVO AU - MARIO HUMBERTO CARDIEL-RÍOS AU - INGRIS PELÁEZ-BALLESTAS TI - Validity of the COPCORD Core Questionnaire as a Classification Tool for Rheumatic Diseases AID - 10.3899/jrheum.100955 DP - 2011 Jan 01 TA - The Journal of Rheumatology PG - 31--35 VI - 86 4099 - http://www.jrheum.org/content/86/31.short 4100 - http://www.jrheum.org/content/86/31.full SO - J Rheumatol2011 Jan 01; 86 AB - Objective. Rheumatic diseases are vastly underdiagnosed and undertreated, particularly among minorities and those of low socioeconomic status. The WHO-ILAR Community Oriented Program in the Rheumatic Diseases (COPCORD) advocates screening of musculoskeletal complaints in the community. The objective of this study was to evaluate the performance of the COPCORD Core Questionnaire (CCQ) as a diagnostic tool for rheumatic diseases. Methods. We conducted a cross-sectional study designed in parallel with a large COPCORD survey in Mexico. A subsample of 17,566 questionnaires, selected from 4 of the 5 states included in a national COPCORD survey were included in the analysis as a diagnostic test to evaluate sensitivity, specificity, receiver operating characteristics curve (ROC), and positive likelihood ratio (LR+) of the CCQ as a case-detection tool for rheumatic diagnosis and for the most frequent diagnoses identified in the survey, osteoarthritis, regional rheumatic pain syndromes, and rheumatoid arthritis (RA). Logistic regression with the questions with LR+ ≥ 1 was performed to identify the strength of association (OR) for each question. Results. Pain in the last 7 days, high pain score (> 4), and previous diagnosis were the questions with highest LR+ for diagnosis, and for diagnosis of RA treatment with NSAID. The variables that contributed most to the model were pain in the last 7 days (OR 2.0, 95% CI 1.8–2.3), NSAID treatment (OR 3.3, 95% CI 3.0–3.7), a high pain score (OR 1.15, 95% CI 1.13–1.17), and having a previous diagnosis (OR 1.4, 95% CI 1.3–1.6). These 4 questions had R2 = 0.24, p < 0.01, for detection of any rheumatic diagnosis. The single variable that explains 16% (OR 1.33, 95% CI 1.31–134) of variance was a high pain score in the last 7 days. Conclusion. Some variables were identified in the CCQ that could be combined in a brief version for case detection of rheumatic diseases in community surveys. The validity of this proposal has to be tested against the original version.