Modified disease activity scores that include twenty-eight-joint counts. Development and validation in a prospective longitudinal study of patients with rheumatoid arthritis.

M L Prevoo, M A van 't Hof, H H Kuper, M A van Leeuwen, L B van de Putte, P L van Riel

Arthritis and Rheumatism 1995 January

OBJECTIVE: The development and validation of Modified Disease Activity Scores (DAS) that include different 28-joint counts.

METHODS: These scores were developed by canonical discriminant analyses and validated for criterion, correlational, and construct validity. The influence of disease duration on the composition of the DAS was also investigated.

RESULTS: No influence of disease duration was found. The Modified DAS that included 28-joint counts were able to discriminate between high and low disease activity (as indicated by clinical decisions of rheumatologists).

CONCLUSION: The Modified DAS are as valid as disease activity scores that include more comprehensive joint counts.

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