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At the beginning, none of participants, aged 35 to 47, had evidence of coronary artery calcification. However, five years later, 27 percent of those who were sleeping less than five hours a night on average had developed coronary artery calcification for the first time, while only 6 percent of those who were sleeping seven hours or more developed it. Furthermore, among those who were sleeping between five and seven hours a night, 11 percent had developed coronary artery calcification.
