en Dermathology Dermathology Original Article Original Article <span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="line-height:14pt"><b><i><span style="color:blue">Background</span></i></b><i><span style="color:blue">:</span></i> The Early Arthritis for Psoriatic Patients (EARP) questionnaire is a fast and simple way to screen psoriatic arthritis. This study was carried out to investigate the diagnostic accuracy of the Persian version of the Early Arthritis for Psoriatic Patients (P-EARP) questionnaire.<span style="font-size:9.0pt"></span></span><br> <span style="line-height:14pt"><b><i><span style="color:blue">Methods:</span></i></b> A total of 100 psoriasis patients responded to the questionnaire after the translation procedure (translation, back translation). After determining the validity of the questionnaire, the diagnostic accuracy of the P-EARP questionnaire was assessed using the ROC curve (receiver operating characteristic curve). Internal and external reliability of the questionnaire were also evaluated by statistical tests.</span><br> <span style="line-height:14pt"><b><i><span style="color:blue">Results:</span></i></b> In assessing the reliability of the questionnaire using test-retest, correlation coefficient (r=0.994, p <0.001) and Cronbach&#39;s alpha (&alpha; = 0.85) were obtained. The P-EARP questionnaire had a sensitivity and specificity of 90.48% and 96.55% in ROC analysis, respectively, and cutoff point 3 was regarded as the cutoff point of the P-EARP questionnaire like the original version of the questionnaire (EARP).<b><i><span style="color:blue"></span></i></b></span><br> <span style="line-height:14pt"><b><i><span style="color:blue">Conclusion</span></i></b><i><span style="color:blue">:</span></i> The results of this study showed that the P-EARP questionnaire had high sensitivity and specificity for the identification of psoriatic arthritis. The P-EARP questionnaire is an appropriate screening tool for the identification of psoriatic arthritis in the dermatology clinics.<b><i><span style="color:#0033cc"></span></i></b></span></span></span><br> &nbsp; Questionnaire, Psoriatic Arthritis, Reliability and Validity 213 216 http://caspjim.com/browse.php?a_code=A-10-134-5&slc_lang=en&sid=1 Azar Shirzadian Kebria rohanresearch88@gmail.com 100319475328460041825 100319475328460041825 No Department of Dermatology, Clinical Research Development Unit of Ayatollah Rouhani Hospital ,Babol University of Medical Sciences, Babol ,Iran Abolfazl Eftekhari rohanresearch88@gmail.com 100319475328460041826 100319475328460041826 No Clinical Research Development Unit of Ayatollah Rouhani hospital, Babol University of Medical Sciences, Babol, Iran Khadijeh Ezoji rohanresearch88@gmail.com 100319475328460041827 100319475328460041827 No Social Determinants of Health Research Center, Health Research Institute, Clinical Research Development Unit of Ayatollah Rouhani Hospital, Babol University of Medical Sciences, Babol, Iran Soudabeh Tirgar tabari rohanresearch88@gmail.com 100319475328460041828 100319475328460041828 No Department of Dermatology, Clinical Research Development Unit of Ayatollah Rouhani Hospital, Babol University of Medical Sciences, Babol, Iran Zeinab Aryanian rohanresearch88@gmail.com 100319475328460041829 100319475328460041829 No Autoimmune Bullous Diseases Research Center, Tehran University of Medical Sciences Tehran, Iran Soraya Khafri rohanresearch88@gmail.com 100319475328460041830 100319475328460041830 No Department of Social Medicine and Health, Babol University of Medical Sciences, Babol, Iran Mansour Babaei babaeim47@yahoo.com 100319475328460041831 100319475328460041831 Yes Mobility Impairment Research Center, Department of Rheumatology, Clinical Research Development Unit of Ayatollah Rouhani Hospital, Babol University of Medical Sciences, Babol, Iran