title: Association of self-reported sleep duration and hypertension: Results of a Chinese prospective cohort study.
abstract: OBJECTIVE
  To examine the association of self-reported sleep duration and hypertension using the data from Tianjin China.
  
  
  METHODS
  Participants aged 40-70 years without hypertension were recruited with a stratified cluster sampling method across six districts of Tianjin, China. Information regarding their sociodemographic and lifestyle-related characteristics was gathered by questionnaires. After 2 years of follow-up, the second physical examination was taken on the same crowd.
  
  
  RESULTS
  During the 2-year period, 874 subjects (221 men, 653 women) were successfully contacted. Multivariate logistic regression was used to analyze the relationship between the frequency of incident hypertension after the 2-year follow-up and sleep duration according to age groups. Among the younger age group (40-<55 years), a short sleep duration (≤ear h) was associated with a significantly higher risk of hypertension compared with sleeping for 7-8 h in unadjusted analyses (OR: 3.15 [95% CI: 1.04-9.54]). In a model after adjustment for the impact factors, a significant difference was also found in the frequency of incident hypertension.
  
  
  CONCLUSIONS
  In our study, a short sleep duration (≤sho h) is a significant risk factor for hypertension in younger subjects, with no association among older subjects.
authors.affiliation: a Department of Cardiology , Tianjin Medical University General Hospital , Tianjin , China.
authors.forename: Xianming
authors.initials: X
authors.lastname: Wu
authors.affiliation: a Department of Cardiology , Tianjin Medical University General Hospital , Tianjin , China.
authors.forename: Yuemin
authors.initials: Y
authors.lastname: Sun
authors.affiliation: b Department of Nutrition and Food Science, School of Public Health , Tianjin Medical University , Tianjin , China.
authors.forename: Kaijun
authors.initials: K
authors.lastname: Niu
authors.affiliation: a Department of Cardiology , Tianjin Medical University General Hospital , Tianjin , China.
authors.forename: Wei
authors.initials: W
authors.lastname: Yao
authors.affiliation: a Department of Cardiology , Tianjin Medical University General Hospital , Tianjin , China.
authors.forename: Bo
authors.initials: B
authors.lastname: Bian
authors.affiliation: a Department of Cardiology , Tianjin Medical University General Hospital , Tianjin , China.
authors.forename: Xuefang
authors.initials: X
authors.lastname: Yu
authors.affiliation: a Department of Cardiology , Tianjin Medical University General Hospital , Tianjin , China.
authors.forename: Huanhuan
authors.initials: H
authors.lastname: Zhao
authors.affiliation: a Department of Cardiology , Tianjin Medical University General Hospital , Tianjin , China.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Huang
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D006973:Hypertension / Q000453:epidemiology / Q000209:etiology / Q000503:physiopathology / Q000523:psychology; D008019:Life Style; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D058246:Prehypertension / Q000453:epidemiology; D011446:Prospective Studies; D012307:Risk Factors; D057566:Self Report; D012890:Sleep / Q000502:physiology; D012892:Sleep Deprivation / Q000150:complications / Q000503:physiopathology; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D013997:Time Factors
keywords: Age; hypertension; ideal blood pressure; pre-hypertension; sex; sleep duration