The study was carried out in Korea between 2004 to 2013, and includes information on demographics, medical history, medication use, diet, and exercise levels. Samples of bodily fluids including urine and plasma were also collected from the participants.
Overall, 29 percent of men and 24 percent of women studied had metabolic syndrome.
The paper published in the journal BMC Public Health investigated data on over 133,000 Korean men and women aged between 40 to 69 years of age. They were asked: “In the past year, on average, how many hours/minutes of sleep (including daytime naps) did you take per day?” The study didn’t differentiate between nighttime sleep and naps during the day.