Multivariate analysis of covariance for factors associated simplified disease activity index of rheumatoid arthritis.

Multivariate analysis of covariance was used to analyze the effect size of the clinical diagnosis of periodontitis based upon maximal probing depth≧4 mm and the presence of P. gingivalis for disease activity of rheumatoid arthritis after adjusting for age, sex, smoking status, frequency of tooth brushing per a day. Disease activity of rheumatoid arthritis was evaluated by simplified disease activity index. SDAI; simplified disease activity index, P; P value, ES; Effect size*; pMultivariate analysis of covariance for factors associated simplified disease activity index of rheumatoid arthritis.