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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

.53) at home and 3.31 sorties per wk (SD = 0.36) while deployed. Baseline problems at home station with ACCES were reported in 39% of aircrew. Affected aircrew noted that ear discomfort was the most prevalent problem (87% of respondents who noted problems). In the deployed environment, the number of aircrew reporting problems increased to 79.7%, an absolute increase of 40.7% (95% CI 24.6–56.8%, P < 0.0001). Again, ear discomfort was most frequently cited by aircrew (89% of respondents that noted problems). Skin redness and pain increased in prevalence, and skin