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.
Hundreds of thousands of Hmong have since left Southeast Asia and brought the intriguing Hmong culture to distant parts of the world. About 3 million Hmong remain in China, 780,000 in Vietnam, 460,000 in Laos, and 150,000 in Thailand. Approximately four million people around the world people speak Hmong, a tonal language. In the 1950s, Christian missionaries developed a written form of Hmong based on the Roman alphabet.