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.
The Hmong are an ethnic group from the highlands of Laos. When a communist movement called the Pathet Lao began to gain power in Laos during the Vietnam War, the Central Intelligence Agency recruited the Hmong to fight the communists and attack North Vietnamese supply lines. The resulting conflict far outlasted the Vietnam War.