BackgroundHuman vitamin D status primarily depends on skin exposure to the ultraviolet B (UVB) spectrum of the sunlight.Despite the many days of sunshine in Mongolia, the northern latitute means that much of the UVB is filteredout as it passes through the atmosphere. Studies of Mongolian infants, schoolchildren, and pregnant womenreveal prevalent and profound vitamin D deficiency in the winter months in Mongolia. To date, there has notbeen a single study of the vitamin D levels of Mongolian men, and no studies of working age women outside ofUlaanbaatar. The goal of this study is to determine Vitamin D levels among Mongolian working age populationin different geographical areas, in different seasons, and in different work settings.MethodsThis cross-sectional study was conducted among 120 healthy adults, recruited by a multistage clustersampling method in Ulaanbaatar, South Gobi, and Bulgan. Each participant was tested for serum 25(OH)Dconcentrations, twice in winter and summer. Samples were measured by ELISA. The paired sampling (120summer samples/120 winter samples total 240 samples) frame allowed us to compare an individual’s winter25(OH)D levels to their own summer 25(OH)D levels, avoiding any confounding by differences betweenindividuals. A paired T-test (two sided) with unequal variances was used to test for differences in 25(OH)Dlevels among study groups.Results95% of all participants were Vitamin D deficient (<20 ng/ml) in winter, 24% deficient in summer (p < 0.001).The mean winter serum 25(OH)D levels were (±SD) 10.7±5.3 ng/ml, which were doubled in the summer to(±SD) 26.1±8.1 ng/ml. In all three regions, men and women had similar mean 25(OH)D levels. In Ulaanbaatar,office workers had higher winter 25(OH)D levels than urban outdoor workers. Surprisingly, office workersin the Gobi had higher 25(OH)D levels than nomads in both winter and summer. In Bulgan, there were nodifferences between office workers and nomads in any season.ConclusionWe observe that low vitamin D levels are more prevalent in our winter samples of healthy working age adults.The prevalence of vitamin D deficiency is very high amongst the adult population. These data suggest a needto increase vitamin D intake either through improved fortification and/or supplementation.

Introduction: The World Association of Medical Education organizes medical education and postgraduate student training worldwide.
One of the indicators of the quality assurance of higher medical education is the need for schools providing medical education to have a unified evaluation method and to assess the level of knowledge, skills, and attitudes acquired by students. In order to objectively evaluate the student to improve the assessment of clinical skills, it is necessary to regularly evaluate the examination parameters. Thus, the evaluation of the clinical skills of the schools providing medical education needs to be accurate and objective, and it is necessary to develop a general evaluation model, so this study was selected for conducting. Goal: Analyzing tasks in advanced skills tests Material and Methods: In our research work, we used the numerical data of the students’ achievement presented to him by a total of n=113 clinical case assignments of the 6 stations of the 5th year advanced skills test of the School of Health of Etugen University. Research results: Examining the reliability of the progress skills test with examinee performance at each of the 6 stations, reliability at the anamnesis station (KR=0.91) was a maximum score of 100, a minimum score of 16.5, and reliability at the actual examination station (KR=0.90) was a maximum score of 100, minimum score 40, reliability on diagnosis station (KR=0.93) maximum inter-examiner score 100, minimum score 61, reliability on manual action station (KR=0.88) maximum inter-examiner score 100, minimum score 64, reliability on treatment station (KR=0.85) The maximum score of the examinees was 100, the minimum score was 23, and the reliability of the counseling center (KR=0.90) was the maximum score of the examinees was 100, and the minimum score was 45. Conclusion
1. The reliability of the test is at a sufficient level without statistically significant differences in 6 stations.
2. The clinical case of each examination station differs in the degree of difficulty of the task: 30 percent (n=95) of the 20 tasks at the treatment station are very difficult, 33.0 percent (n=104) are difficult, 22.7 percent (n=87) are ideal, and 8.9 percent are ideal. (n=28) clinical cases with mild symptoms were evaluated. It is possible to set a threshold of 70 percent for passing the Advanced Skills Test.