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The results showed that a full 17 percent of African American test subjects had a case of obstructive sleep apnea present, compared to 8 percent of the Caucasian subjects. This denotes a hypothesis that African Americans stand an increased risk of obstructive sleep apnea.
Knowledge center. Obstructive sleep apnea, also known as OSA, is a sleep disorder in which the person stops breathing for at least 10 seconds each hour during sleep. It is caused by relaxation of the throat muscles; the soft tissue in the back of the throat collapses and closes, resulting in blocked airways.