Relationship Between Sleep Duration and Incident Coronary Artery Calcification—Reply
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In Reply: Ms Vichayavilas and Mr Kelly have raised an interesting question about whether heavy caffeine consumption might explain the higher risk of incident coronary artery calcification among those with shorter measured sleep duration. We are able to investigate the role of caffeine in our study. In the Coronary Artery Risk Development in Young Adults (CARDIA) year-20 examination, which was the follow-up examination in our ancillary sleep study, detailed diet data were collected using an interviewer-administered quantitative food-frequency questionnaire,1 assisted by plastic food models and food estimation tools such as measuring cups. Average daily caffeine intake was estimated using the nutrient database developed by the Nutrition Coordinating Center at the University of Minnesota (version 36).
Because our primary analysis found a significant trend in the association between sleep duration (modeled as a continuous variable) and incident calcification across the entire range of sleep durations, we investigated caffeine consumption for the . . . [Full Text of this Article]
Diane S. Lauderdale, PhD
lauderdale@uchicago.edu
Christopher Ryan King, BS
Department of Health Studies
University of Chicago
Chicago, Illinois
Kiang Liu, PhD
Northwestern University Feinberg School of Medicine
Chicago
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Relationship Between Sleep Duration and Incident Coronary Artery Calcification
Piyagarnt Vichayavilas and Caleb Kelly
JAMA. 2009;301(18):1879.
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