PT  - JOURNAL ARTICLE
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
TI  - Prevalence and Clinical Characteristics of Psoriatic Arthritis in Japan
AID  - 10.3899/jrheum.141598
DP  - 2015 Aug 01
TA  - The Journal of Rheumatology
PG  - 1439--1442
VI  - 42
IP  - 8
4099  - http://www.jrheum.org/content/42/8/1439.short
4100  - http://www.jrheum.org/content/42/8/1439.full
SO  - J Rheumatol2015 Aug 01; 42
AB  - 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.