en <span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Calibri,sans-serif"><b><span style="font-size:10.0pt"><span cambria="" style="font-family:"><span style="color:#f79646">Aims:</span></span></span></b><span style="font-size:10.0pt"><span cambria="" style="font-family:"> The present study aimed to determine veterans&#39; mental health indicators based on the Item Response Theory.</span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Calibri,sans-serif"><b><span style="font-size:10.0pt"><span cambria="" style="font-family:"><span style="color:#f79646">Information & Methods:</span></span></span></b><span style="font-size:10.0pt"><span cambria="" style="font-family:"> 474 veterans participated in this instrumental-psychometric study. The quality of life (SF-12), mental disorders checklist (SCL-90), and daily activities (Bartel) tools were used for data gathering. The data was analyzed using the DETECT method and multivalued Item response theory models. Likelihood indicators and Akaike&rsquo;s information criterion were used to model data fit. </span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Calibri,sans-serif"><b><span style="font-size:10.0pt"><span cambria="" style="font-family:"><span style="color:#f79646">Findings:</span></span></span></b><span style="font-size:10.0pt"><span cambria="" style="font-family:"> The mean age of the veterans was 53.4&plusmn;35.2 years. 266 veterans had physical injuries, and 208 (43.9%) had mental health problems in addition to physical injuries. The mean of items was 3.92 to 2.30. The highest experimental reliability was related to the Neuroticism dimension (0.91). The levels of dimension information were 3&plusmn;, and the neuroticism dimension had the best level of information compared to other dimensions.</span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Calibri,sans-serif"><b><span style="font-size:10.0pt"><span cambria="" style="font-family:"><span style="color:#f79646">Conclusion: </span></span></span></b><span style="font-size:10.0pt"><span cambria="" style="font-family:">The questionnaire on mental health indicators has four dimensions, and the questionnaire items, with adequate experimental reliability, can give information at all levels of ability. </span></span></span></span></span><br> &nbsp; Indicators of Mental Health,Veterans,Item Response Theory, 405 413 http://ijwph.daneshafarand.org/browse.php?a_code=A-10-793-4&slc_lang=en&sid=3 F. Lorestani 1003194753284600379221 1003194753284600379221 No Department of Psychology, Saveh Branch, Islamic Azad University, Saveh, Iran M.H. Zarghami 1003194753284600379220 1003194753284600379220 No Behavioral Science Research Center, Lifestyle Research Institute, Tehran, Iran F. Shatrian Mohamadi 1003194753284600379113 1003194753284600379113 Yes Department of Psychology, Saveh Branch, Islamic Azad University, Saveh, Iran