en Psychiatry Psychiatry Original Research Original Research <strong>Background: </strong>Despite studies about anxiety in the older adult, the prevalence of anxiety in this age group is not exactly clear, which may be due to the use of tools and criteria that were not born for this age group. One of the instruments designed to assess anxiety in the elderly is the Geriatric Anxiety Inventory (GAI). The aim of this research was to analyze the psychometric properties of the Persian version of the Geriatric Anxiety Inventory (GAI-PV) and its short form (GAI-PV-SF) in a sample of older adults in Iran.<br> &nbsp;&nbsp; <strong>Methods:</strong> In this cross-sectional study, a sample of 150 community-dwelling and a psychogeriatric sample of 48 adults older than 60 years completed the GAI-PV and GAI-PV-SF, the anxiety sub-scale of the General Health Questionnaire (GHQ-28), the Geriatric Depression Scale (GDS-15), and the Structured Clinical Interview for DSM-IV (SCID-I). Different types of validity and reliability were evaluated for GAI-PV and GAI-PV-SF using SPSS and the LISREL software.<br> &nbsp;&nbsp; <strong>Results:</strong> Both the GAI-PV and GAI-PV-SF exhibited excellent internal consistency (over 80 %) and desirable concurrent validity against GHQ-28 and GDS-15. The optimal cutpoint score to detect current generalized anxiety disorder (GAD) was 10/11 and 13/14 for GAI-PV in the community-dwelling and psychogeriatric samples, respectively, and 3/4 for GAI-PV-SF in both study samples.&nbsp; Good test-retest reliability (correlation coefficient: 0.96 and 0.88 for GAI-PV and GAI-PV-SF, respectively) and a single-factor structure were also demonstrated.<br> &nbsp;&nbsp; <strong>Conclusion: </strong>Sound psychometric properties of the GAI-PV in both subsamples suggest that the instrument could be used successfully as an accurate screening instrument in the elderly Iranian population.<br> &nbsp; Geriatric Anxiety Inventory (GAI), Aged, Psychometric Property, Validity, Reliability 366 374 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-5493-1&slc_lang=en&sid=1 Mohsen Shati shati.m@iums.ac.ir 200319475328460063337 200319475328460063337 No Mental Health Research Center, Psychosocial Health Research Institue, Iran University of Medical Sciences, Tehran, Iran Seyede salehe Mortazavi mortazavi.ss@iums.ac.ir 200319475328460063338 200319475328460063338 Yes School of Behavioral Sciences and Mental Health (Tehran Institute of Psychiatry) & Spiritual Health Research Center, Iran University of Medical Sciences, Tehran, Iran Mozhgan Taban taban.m@iums.ac.ir 200319475328460063339 200319475328460063339 No Mental Health Research Center, Psychosocial Health Research Institue, Iran University of Medical Sciences, Tehran, Iran Seyed Kazem Malakouti malakouti.k@iums.ac.ir 200319475328460063340 200319475328460063340 No Mental Health Research Center, Psychosocial Health Research Institue, Iran University of Medical Sciences, Tehran, Iran Shiva Mehravaran shiva.mehr@gmail.com 200319475328460063341 200319475328460063341 No ASCEND Center for Biomedical Research, Morgan State University, Baltimore, MD, USA Ali Norouzi a_norouzi@razi.tums.ac.ir 200319475328460063342 200319475328460063342 No Medical Education Department, Medical School, Tehran University of Medical Sciences, Tehran, & Education Development Center, Zanjan University of Medical Sciences, Zanjan, Iran Nancy A. Pachana npachana@psy.uq.edu.au 200319475328460063343 200319475328460063343 No School of Psychology, University of Queensland, Brisbane, Australia