title: Short Sleep Duration and Its Correlates among Cancer Survivors in Korea: the Korea National Health and Nutrition Examination Surveys.
abstract: BACKGROUND
  Though a large proportion of cancer survivors are assumed to be commonly affected by sleep disturbance, few studies have focused on short sleep problems and its correlates among Korean cancer survivors. The purpose of this study was to evaluate the prevalence of short sleep in adult cancer survivors from a nationwide population-based sample and to identify risk factors for short sleep duration.
  
  
  METHODS
  Based on the fourth and fifth Korea National Health and Nutrition Examination Surveys (2007-2012), 1,045 cancer survivors and 33,929 non-cancer controls were analyzed. The prevalence of short sleep was compared between these two groups. Associations between short sleep and its correlates were evaluated using multiple logistic regression among cancer survivors: odds ratios (ORs) and 95% confidence intervals (95%CIs) were estimated after adjusting for sociodemographic factors, lifestyle factors, psychological conditions, and cancer-related factors.
  
  
  RESULTS
  About 8.1% of cancer survivors slept for less than 5 hours per day (6.2% men and 9.3% women), whereas this was the case for only 3.7% of non-cancer controls. Cancer survivors who had the lowest household income level showed a significantly higher likelihood for short sleep (adjusted OR 2.82, 95%CI 1.06-7.54). Self-reported poor health and depressive symptoms were found to be associated with significantly increased likelihood for short sleep in cancer survivors (adjusted OR 3.60, 95%CI 1.40-9.26 and adjusted OR 2.00, 95%CI 1.17-3.42). Gastric cancer survivors had a 3.97-fold increased risk for short sleep (95%CI 1.60-9.90).
  
  
  CONCLUSIONS
  The prevalence of short sleep occurs at a high rate among the Korean cancer survivors, which may indicate a poorer quality of life and a higher risk of future complications in survivorship. Targeted interventions that can assist cancer survivors to cope with sleep disturbances as well as ensuring psychological stability are warranted to reduce the latent disease burden.
authors.affiliation: Department of Biomedical Sciences, Seoul National University Graduate School, Seoul, Republic of Korea E-mail : dhkang@snu.ac.kr.
authors.forename: Hyung-Suk
authors.initials: HS
authors.lastname: Yoon
authors.forename: Jae Jeong
authors.initials: JJ
authors.lastname: Yang
authors.forename: Minkyo
authors.initials: M
authors.lastname: Song
authors.forename: Hwi-Won
authors.initials: HW
authors.lastname: Lee
authors.forename: Yunhee
authors.initials: Y
authors.lastname: Lee
authors.forename: Kyoung-Mu
authors.initials: KM
authors.lastname: Lee
authors.forename: Sang-Ah
authors.initials: SA
authors.lastname: Lee
authors.forename: Jong-Koo
authors.initials: JK
authors.lastname: Lee
authors.forename: Daehee
authors.initials: D
authors.lastname: Kang
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications* / Q000401:mortality; D009749:Nutrition Surveys; D011379:Prognosis; D011788:Quality of Life; D056910:Republic of Korea; D012307:Risk Factors; D012893:Sleep Wake Disorders / Q000209:etiology* / Q000401:mortality / Q000523:psychology; D011795:Surveys and Questionnaires; D015996:Survival Rate; D017741:Survivors / Q000523:psychology*; D013997:Time Factors; D055815:Young Adult