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.
Thai and Vietnamese people looks different from the rest of ASEAN...with many of Thais that looks like Korean.... Khmer and Lao people seems originated from Malay (maritime Malaysia, Indonesia and Borneo, and the Southern Philippines)...Taiwanese aborigines might also influence ASEAN people, starting from Northern Philippines to Peninsular Malaysia. read a book called China's Tibet and it mentioned a small history of the Mon-Khmer people being the indigenous of the Central Tibet and then later the Qiang (Tibetans) came and drove them to South East Asia and some got assimilated in the Tibetan population.