TY - JOUR T1 - Prevalence and Clinical Characteristics of Psoriatic Arthritis in Japan JF - The Journal of Rheumatology JO - J Rheumatol SP - 1439 LP - 1442 DO - 10.3899/jrheum.141598 VL - 42 IS - 8 AU - Yuri Ohara AU - Mitsumasa Kishimoto AU - Naoho Takizawa AU - Kazuki Yoshida AU - Masato Okada AU - Hikaru Eto AU - Gautam A. Deshpande AU - Christopher T. Ritchlin AU - Atsushi Tanaka AU - Mari Higashiyama AU - Kazuo Matsui AU - Shigeyoshi Tsuji Y1 - 2015/08/01 UR - http://www.jrheum.org/content/42/8/1439.abstract N2 - Objective. To investigate the prevalence of psoriatic arthritis (PsA) in Japanese patients with psoriasis.Methods. A multicenter, noninterventional, retrospective cross-sectional study was conducted at 3 tertiary care centers in Japan. PsA was diagnosed by rheumatologists based on clinical findings. Prevalence of PsA, clinical characteristics, comorbidities, and treatment patterns were examined.Results. PsA was identified in 431 of 3021 patients with psoriasis, with a mean prevalence of 14.3% (range, 8.8–20.4%). No large differences between these results and previous reports from Western countries were observed in arthritis distribution, skin disease type, or treatment selection.Conclusion. The prevalence of PsA in patients with psoriasis in Japan approaches 20% in some areas, similar to that observed in Western countries, and is higher than previously reported in Asia. Clinical features including age, sex, age at onset, and manifestation patterns were also similar to those reported in the West. ER -