Cross-cultural adaptation and preliminary validation of the Korean version of the Psoriatic Arthritis Impact of Disease-12 questionnaire

Koo, Bon San; Kim, Jung Gon; Yoon, Bo Young; Kang, Ji-Hyoun; Choi, Sung-Eun; Jung, Sooin; Kim, Seyeong; Kim, Tae-Jong

doi:2026.41.2.341

Korean J Intern Med > Volume 41(2); 2026 > Article

ORIGINAL ARTICLE

Rheumatology

Korean J Intern Med. 2026;41(2):341-349. doi: https://doi.org/10.3904/kjim.2025.101

Cross-cultural adaptation and preliminary validation of the Korean version of the Psoriatic Arthritis Impact of Disease-12 questionnaire

Bon San Koo¹, Jung Gon Kim¹, Bo Young Yoon¹, Ji-Hyoun Kang², Sung-Eun Choi², Sooin Jung³, Seyeong Kim⁴, and Tae-Jong Kim²

¹Division of Rheumatology, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea
²Department of Rheumatology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea
³Department of English Language and Literature, Chosun University, Gwangju, Korea
⁴Department of Biochemistry, University of Illinois at Chicago, Chicago, IL, USA

Corresponding Author: Tae-Jong Kim , Tel: +82-62-220-6294, Fax: +82-62-222-6592, Email: ktj1562@chonnam.ac.kr

Received: March 28, 2025; Revised: August 4, 2025; Accepted: October 20, 2025.

Abstract

Background/Aims: The Psoriatic Arthritis Impact of Disease (PsAID-12) questionnaire was developed to measure quality of life and disease impact in patients with psoriatic arthritis (PsA). We aimed to translate the English PsAID-12 into Korean and to evaluate its reliability and validity.
Methods: The PsAID-12 questionnaire was translated into Korean following international cross-cultural adaptation guidelines. After expert review and cognitive debriefing with 10 patients, the final Korean version of the PsAID-12 was established. For validation, 21 patients with PsA completed the Korean PsAID-12 questionnaire, and a retest was conducted one week later to assess reliability. Demographic data and disease activity indices, including the Disease Activity in Psoriatic Arthritis (DAPSA) and Visual Analog Scale (VAS) pain were collected. Correlations between PsAID-12 scores and disease activity indices were analyzed.
Results: Minor discrepancies in the translation process were resolved during the synthesis and review. The mean PsAID-12 scores were 3.9 ± 2.6 and 3.6 ± 2.3 for the first and second assessments, respectively. The mean response time was 2.6 ± 1.0 min. The intraclass correlation coefficient was 0.856 (95% CI 0.682–0.939, p < 0.050), indicating good reliability. The first PsAID-12 score was strongly correlated with the second PsAID-12 (r = 0.79), DAPSA (r = 0.66), and VAS pain (r = 0.67).
Conclusions: The Korean PsAID-12 questionnaire was well translated and validated, showing strong reliability and correlation with disease activity measures. It is therefore appropriate for assessing the impact of PsA in Korean patients.

Keywords: Korean Psoriatic Arthritis Impact of Disease ; Psoriatic arthritis ; Quality of life ; Symptom burden