These health-related causes and impacts of elevated hematocrit levels have been reported: 1  Fall in plasma levels. 2  Sleep apnea. 3  Dehydration. 4  In cases of dengue fever, a high hematocrit is a danger sign of an increased risk of dengue shock syndrome.
The Hmong traditionally farmed in the mountainous areas of China, Vietnam, Laos, and Thailand. Most of the Hmong were subsistence farmers who grew only enough food to feed their families, because farming was difficult in the mountainous regions where most of them lived.
Most of the Hmong in the United States come from Xieng Khouang, Houa Phan, Luang Phrabang, and Sayaboury provinces in northern Laos. Climate of Laos: Tropical monsoon; rainy season (May to November); dry season (December to April). Source: CIA World Factbook 2010 and American Community Survey 2009.