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escalate the risk. Our study’s primary objective is to determine the prevalence of polycythemia in airplane pilots. Assessing associated risk factors of polycythemia is the secondary objective. METHODS Subjects This study is a cross-sectional study. Data was collected from medical records of airplane pilots who applied for Class 1 Aviation Medical Certificate renewal at the Institute of Aviation Medicine, Royal Thai Air Force (RTAF), Bangkok, Thailand, between January 1, 2018, and December 31, 2018. The study was consistent with the Declaration of Helsinki

show different aspects of the daily functioning of the person being assessed. 35 Wisconsin Card Sorting Test (WCST). Developed by Berg and Grant 5 to assess the capacity for abstraction and ability to alter cognitive strategies in response to environmental changes. A computerized version was used in this study. There are no statistically significant differences between the manual and computerized versions. 36 The results obtained from the WCST were then analyzed using performance indices obtained from the general adult population, taken

using an alpha of 0.05, power of 0.8, and two-sided tests. The calculated sample size, response probability, variable distributions, and effect size from the fully adjusted models were used to perform a power analysis. Statistical analyses were performed using SAS version 9.4. Exact P -values were presented. This study was reviewed and approved by the Uniformed Services University of the Health Sciences Institutional Review Board. RESULTS A total of 106,963 female officers were identified, of which 86,908 had valid officer DOD occupation codes during the