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Int. J. Environ. Res. Public Health 2015, 12(5), 5603-5613; doi:10.3390/ijerph120505603

Season of Birth, Sex and Sleep Timing Preferences

1
Department of Preventive Medicine, School of Public Health, Wannan Medical College, Wuhu 241001, China
2
Laboratory for Environment and Health, School of Earth and Environment, Anhui University of Science and Technology, Huainan 231001, China
3
School of Science and Engineering, Tulane University, New Orleans, LA 70112, USA
4
Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Texas Tech University Health Sciences Center, Lubbock, TX 79416, USA
5
School of Medicine, Tulane University, 1430 Tulane Ave, New Orleans, LA 70112, USA
6
Histecon Associates, Inc. Little Rock, AR 72205, USA
7
Saw Swee Hock School of Public Health, National University of Singapore, 117549, Singapore
8
Department of Epidemiology, School of Public Health, Medical College of Soochow University, Suzhou 215123, China
9
Department of Epidemiology, School of Public Health and Tropical Medicine, Tulane University, New Orleans, LA 70112, USA
10
School of Food Science, Guangdong Pharmaceutical University, Zhongshan 528458, China
11
School of Public Health and Tropical Medicine, Tulane University, New Orleans, LA 70112, USA
12
Department of Epidemiology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing 100005, China
13
School of Basic Medicine, Peking Union Medical College, Beijing 100005, China
*
Author to whom correspondence should be addressed.
Received: 19 March 2015 / Revised: 12 May 2015 / Accepted: 15 May 2015 / Published: 22 May 2015
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Abstract

Objective: To evaluate whether the season of birth and sex are associated with preferences for bedtime among Chinese adults. Methods: A national population-based study on sleep preferences was conducted among Chinese in 2008. A questionnaire was used to collect information on the sleep time of Chinese adults. Analysis of covariance was used to examine the relationship between season of birth and preferences for bedtime. Two sets of potential confounders were used in the adjusted models. Model 1 adjusted for age. Model 2 additionally adjusted for area, occupation, education level, smoking, and drinking. Participants and Measurements: The questionnaire was administered to a sample of 3959 Chinese adults. Results: Men had a higher delayed mean sleep onset and offset time (22:38 and 6:32) than women (22:18 and 6:25). Men also slept for a shorter duration compared to women (7 h 54 min vs. 8 h 7 min). Women born in fall had the latest sleep onset time sleep offset time (22:23/6:30), compared to their counterparts born in winter. These associations were attenuated by additional adjustments of more confounders. Conclusions: There were significant differences in sleep timing preferences between men and women. Season of birth was not associated with sleep timing in Chinese adults. View Full-Text
Keywords: season of birth; sex; sleep timing season of birth; sex; sleep timing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Huang, Y.; Lin, D.; Lu, C.; Ali, G.; Metzger, J.; Shankar, N.; Xu, T.; Sun, W.; Shan, G. Season of Birth, Sex and Sleep Timing Preferences. Int. J. Environ. Res. Public Health 2015, 12, 5603-5613.

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