en Health Health Original Research Original Research <span style="font-size:13pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="text-autospace:none"><span new="" roman="" style="font-family:" times=""><span style="font-style:italic"><b><span style="font-size:9.0pt"><span style="font-style:normal">Background: </span></span></b><span style="font-size:9.0pt"><span style="font-style:normal">Nurses&#39; resilience in the care of patients with Coronavirus Disease 2019 (COVID-19) is essential. This study aimed to develop and validate an instrument for assessing nurses&#39; resilience control resources in the COVID-19 pandemic.</span></span></span></span></span></span></span></span><br> <span style="font-size:13pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="text-autospace:none"><span new="" roman="" style="font-family:" times=""><span style="font-style:italic"><span style="font-size:9.0pt"><span style="font-style:normal">&nbsp;&nbsp;&nbsp; <b>Methods:</b> In this qualitative study, with a conventional content analysis based on a literature review and semi-structured interviews conducted with 20 nurses, the initial draft of the instrument was prepared in different aspects based on a 5-point scale. The instrument&#39;s face validity and content validity were examined in 15 nurses and 15 experts, and construct validity was obtained in 482 nurses using the available sampling method. Data were analyzed in SPSS software Version 24 using indexes and analytic tests. </span></span></span></span></span></span></span></span><br> <span style="font-size:13pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="text-autospace:none"><span new="" roman="" style="font-family:" times=""><span style="font-style:italic"><span style="font-size:9.0pt"><span style="font-style:normal">&nbsp;&nbsp; <b>Results:</b> Out of 54 items, 18 items were confirmed by the expert panel and the items had content validity ratio and content validity index scores higher than 0.79. According to the results of an exploratory factor analysis, this tool has 4 dimensions: God, chance, internal locus of control, and powerful others. They accounted for 48.06% of the total variance. CFA showed the indices confirmed the model fit (&chi;2/df = 1.846, comparative fit index = 0.921, incremental fit index = 0.923, root mean square approximation<illegal tag>error= 059, goodness of fit index = 0.905). The reliability of the instrument was acceptable (&Omega; > 0.70, &alpha; > 0.7, CR >0.60, and intra-class correlation coefficients > 0.70). </span></span></span></span></span></span></span></span><br> <span style="font-size:13pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="text-autospace:none"><span new="" roman="" style="font-family:" times=""><span style="font-style:italic"><span style="font-size:9.0pt"><span style="font-style:normal">&nbsp;&nbsp; <b>Conclusion</b>: The developed tool is used to measure the control resources of nurses&#39; resilience in caring for COVID-19 patients. It can help recognize the focus areas for developing appropriate interventions.</span></span></span></span></span></span></span></span><br> <br> <span style="font-size:11pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="line-height:200%"><span style="font-family:Calibri,sans-serif"><span lang="AR-SA" dir="RTL" style="font-family:"Times New Roman",serif"></span></span></span></span></span></span> Health Locus of Control, Resilience, COVID-19, Measurement tools 138 145 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-7811-1&slc_lang=en&sid=1 Mahnaz Solhi solhi.m@iums.ac.ir 200319475328460088850 200319475328460088850 No Air Pollution Research Center, Iran University of Medical Sciences, Tehran, Iran Tahereh Dehdari dehdari.t@iums.ac.ir 200319475328460088851 200319475328460088851 No Health Promotion Research Center, Iran University of Medical Sciences, Tehran, Iran Mahasti Emami Hamzehkolaee Emami.mahasti@iums.ac.ir 200319475328460088852 200319475328460088852 Yes Department of Education and Health Promotion, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Hoda Shirafkan hodashirafkan@gmail.com 200319475328460088853 200319475328460088853 No Social Determinants of Health Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran Angela Hamidia Angela_7633@yahoo.com 200319475328460088854 200319475328460088854 No Social Determinants of Health Research Center, School of Medical Babol University of Medical Sciences, Babol, Iran