

The diagnosis of PsA was made according to the Classification criteria for Psoriatic Arthritis (CASPAR). The patients were, then, assessed by a rheumatologist who was blinded to their PEST scores. Patients' demographic parameters, comorbidities, PEST, and Toronto Psoriatic Arthritis Screen (ToPAS 2) results were recorded. The testing procedure for translation and cultural adaptation was carried out according to the following steps: preparation, forward translation, reconciliation, back-translation/back-translation review, harmonization, finalization, and proofreading.

Patients and methods: Between August 2019 and September 2019, a total of 158 adult patients with psoriasis (61 males, 68 females mean age: 43.1☑3.3 years range, 29.8 to 56.4 years) who were not previously diagnosed with PsA were included. This study aims to evaluate the validity and reliability of the PEST questionnaire in Turkish patients with psoriasis. Objectives: The Psoriasis Epidemiology Screening Tool (PEST) is a simple and useful questionnaire designed to screen arthritis in patients with psoriasis. Keywords: Psoriasis epidemiology screening tool, psoriasis, psoriatic arthritis, screening questionnaire. Serdar Kaymaz 1, Uğur Karasu 1, Nida Kaçar 2, Hakan Alkan 3ġDepartment of Internal Medicine, Division of Rheumatology, Medicine Faculty of Pamukkale University, Denizli, TürkiyeĢDepartment of Dermatology, Medicine Faculty of Pamukkale University, Denizli, TürkiyeģDepartment of Physical Medicine and Rehabilitation, Medicine Faculty of Pamukkale University, Denizli, Türkiye Validity and reliability of the Turkish version of Psoriasis Epidemiology Screening Tool for the detection of psoriatic arthritis in patients with psoriasis
