title: The effect of sleep duration on the risk of unintentional injury in Korean adults.
abstract: OBJECTIVE
  The decrease or increase in sleep duration has recently been recognized as a risk factor for several diseases, including hypertension and obesity. Many studies have explored the relationship of decreased sleep durations and injuries, but few have examined the relationship between increased sleep duration and injury. The objective of this research is to identify the risk for injury associated with both decreased and increased sleep durations.
  
  
  METHODS
  Data from the 2010 Community Health Survey were used in this study. We conducted logistic regression with average sleep duration as the independent variable, injury as a dependent variable, and controlling for age, sex, occupation, education, region (cities and provinces), smoking, alcohol use, body mass index, hypertension, diabetes, arthritis, and depression. Seven categories of sleep duration were established: ≤4, 5, 6, 7, 8, 9, and ≥10 hours.
  
  
  RESULTS
  Using 7 hours of sleep as the reference, the adjusted injury risk (odds ratio) for those sleeping a total of ≤4 h/d was 1.53; 1.28 for 5 hours, for 1.11 for 6 hours, 0.98 for 8 hours, 1.12 for 9 hours, and 1.48 for ≥10 hours. The difference in risk was statistically significant for each category except for the 8 and 9 hours. In this study, risk increased as the sleep duration decreased or increased, except for the 8 and 9 hours.
  
  
  CONCLUSIONS
  This research found that either a decrease or increase in sleep duration was associated with an increased risk for injury. The concept of proper sleep duration can be evaluated by its associated injury risk.
authors.affiliation: Department of Health Policy and Management, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Yeon-Yong
authors.initials: YY
authors.lastname: Kim
authors.affiliation: Department of Health Policy and Management, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Un-Na
authors.initials: UN
authors.lastname: Kim
authors.affiliation: Department of Health Policy and Management, Seoul National University College of Medicine, Seoul, Korea. ; Institute of Health Policy and Management, Medical Research Center, Seoul National University, Seoul, Korea.
authors.forename: Jin-Seok
authors.initials: JS
authors.lastname: Lee
authors.affiliation: Institute of Health Policy and Management, Medical Research Center, Seoul National University, Seoul, Korea.
authors.forename: Jong-Heon
authors.initials: JH
authors.lastname: Park
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000428:Alcohol Drinking; D001168:Arthritis / Q000503:physiopathology; D015992:Body Mass Index; D003863:Depression / Q000503:physiopathology; D003920:Diabetes Mellitus / Q000503:physiopathology; D005260:Female; D006306:Health Surveys; D006801:Humans; D006973:Hypertension / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000503:physiopathology; D016017:Odds Ratio; D056910:Republic of Korea; D012307:Risk Factors; D012737:Sex Factors; D012890:Sleep; D012907:Smoking; D011795:Surveys and Questionnaires; D014947:Wounds and Injuries / Q000453:epidemiology*; D055815:Young Adult
keywords: Community health survey; Sleep duration; Wounds and injuries