Diagnosis for joint symptoms at baseline and endpoint.

Diagnosis at baseline is based upon the American College of Rheumatology / European League against Rheumatism (ACR/EULAR) classification criteria for RA in 2010. Diagnosis of RA at endpoint is based upon primary rheumatologists’ diagnosis. Diagnosis at endpoint is based upon the primary rheumatologists’ diagnosis. The diagnosises in non RA→non RA group was Sjogren syndrome (3), Pseudogout (2), Polymyalgia rheumatic (1), Tenosynovitis (1), and Undifferentiated arthritis (22). MTX; methotrexate treatment introduction, PD; diagnosis of periodontitis (maximal probing depth≧4mm), Pg; presence of Porphyromolas gingivalis in subgingival biofilm. Categorical variables were expressed as percentages (numbers) and were analyzed by Pearson’s qui squared test. P values for the different PD status groups at baseline are 0.36 (RA→RA vs non RA→non RA), 0.23 (RA→RA vs non RA→RA), 0.04 (non RA→RA vs non RA→non RA), respectively. P values for different Pg status groups at baseline are 0.37 (RA→RA vs non RA→non RA), 0.44 (RA→RA vs non RA→RA), 0.04 (non RA→RA vs non RA→non RA), respectively.Diagnosis for joint symptoms at baseline and endpoint.