Translation and validation of the Spanish version of the ToPAS (Toronto Psoriatic Arthritis Screening) questionnaire for use on patients with psoriatic arthritis in Dermatology clinics in Colombia

Abstract

Abstract Introduction Psoriatic arthritis screening tools are useful for the rheumatologist in optimizing referrals to the dermatology clinic. The Toronto Psoriatic Arthritis Screening Questionnaire (ToPAS) is a tool that has been developed and validated in Canada. Objectives To translate, and perform some validation tests on TOPAS for use in dermatology clinics in Colombia. Methods Translation and validation of scales. Results ToPAS was translated using standardized methodology. A pilot test was conducted on 20 patients diagnosed with psoriasis and psoriatic arthritis using the final version of the document translated into Spanish, in order to evaluate items of aspects such as understanding, ambiguity, and response time. The tool was then used on 108 patients, including 65 (60.2%) males, with 36 (33.3%) cases with a diagnosis of psoriatic arthritis, and 72 (64.7%) with psoriasis only. Using a cut-off score >8 points, it showed a sensitivity of 75% and specificity 92%, positive predictive value 82% and negative predictive value of 88%. To assess the reliability test–retest, 25 participants were selected and Pearson correlation coefficient was calculated to evaluate the correlation between the first and second application of ToPAS, which gave a value of p = 0.94, which represents a high level of correlation between the first and second application. Conclusions A translation, validation and evaluation of operational characteristics of the ToPAS questionnaire was conducted, being a practical tool for use in the dermatology clinic.