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J Am Geriatr Soc. 2009 Apr;57(4):604-11. doi: 10.1111/j.1532-5415.2008.02171.x. Epub 2009 Feb 10.

Self-reported sleep and nap habits and risk of mortality in a large cohort of older women.

Author information

  • 1Research Institute, California Pacific Medical Center, San Francisco, California 94107, USA. kstone@sfcc-cpmc.net

Abstract

OBJECTIVES:

To determine the association between self-reported sleep and nap habits and mortality in a large cohort of older women.

DESIGN:

Study of Osteoporotic Fractures prospective cohort study.

SETTING:

Four communities within the United States.

PARTICIPANTS:

Eight thousand one hundred one Caucasian women aged 69 and older (mean age 77.0).

MEASUREMENTS:

Sleep and nap habits were assessed using a questionnaire at the fourth clinic visit (1993/94). Deaths during 7 years of follow-up were confirmed with death certificates. Underlying cause of death was assigned according to the International Classification of Diseases, Ninth Revision, Clinical Modification.

RESULTS:

In multivariate models, women who reported napping daily were 44% more likely to die from any cause (95% confidence interval (CI)=1.23-1.67), 58% more likely to die from cardiovascular causes (95% CI=1.25-2.00), and 59% more likely to die from noncardiovascular noncancer causes (95% CI=1.24-2.03) than women who did not nap daily. This relationship remained significant in relatively healthy women (those who reported no comorbidities). Women who slept 9 to 10 hours per 24 hours were at greater risk of death from cardiovascular and other (noncardiovascular, noncancer) causes than those who reported sleeping 8 to 9 hours.

CONCLUSION:

Older women who reported napping daily or sleeping at least 9 hours per 24 hours are at greater risk of death from all causes except cancer. Future research could determine whether specific sleep disorders contribute to these relationships.

PMID:
19220560
[PubMed - indexed for MEDLINE]
PMCID:
PMC2927342
Free PMC Article
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