title: Association of sleep duration with rheumatoid arthritis in Korean adults: analysis of seven years of aggregated data from the Korea National Health and Nutrition Examination Survey (KNHANES).
abstract: To investigate the association between rheumatoid arthritis (RA) and self-reported sleep duration.
  
  
  
  The present study analysed 7 years of aggregated cross-sectional data (2007-2013) from the Korea National Health and Nutrition Examination Surveys (KNHANES).
  
  
  
  A total of 37 979 individuals were selected for the analyses.
  
  
  
  RA.
  
  
  
  Sleep duration.
  
  
  
  After adjusting for confounding factors, the odds of short-duration sleepers (≤6 hours/day) and long-duration sleepers (≥9 hours/day) for RA were 1.23-fold (95% CI 1.101 to 1.51) and 1.27-fold (95% CI 0.85 to 1.88) higher, respectively, than those for persons with sleep duration of 7-8 hours/day. A subgroup analysis according to the extent of pain in RA revealed that the strong relationship between RA and sleep disturbances was observed in those with high pain from RA (OR: 1.28 CI 1.04 to 1.58).
  
  
  
  Individuals with RA may be at a higher risk for sleep disturbances compared with individuals without RA. Therefore, the provision of comprehensive care for patients with RA by healthcare professionals should include assessments of sleep duration and patients with RA should be encouraged to report sleep problems.
authors.affiliation: Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, Republic of Korea.|Institute on Aging, Ajou University Medical Center, Suwon, Republic of Korea.
authors.forename: Jae-Hyun
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.|Institute of Health Services Research, Yonsei University, Seoul, Republic of Korea.
authors.forename: Eun-Cheol
authors.initials: EC
authors.lastname: Park
authors.affiliation: Department of Health Administration, College of Health Sciences, Yonsei University, Wonju, South Korea.
authors.forename: Kwang Soo
authors.initials: KS
authors.lastname: Lee
authors.affiliation: Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, Republic of Korea.|Institute on Aging, Ajou University Medical Center, Suwon, Republic of Korea.
authors.forename: Yunhwan
authors.initials: Y
authors.lastname: Lee
authors.affiliation: Department of Biostatistics, Graduate School of Public Health, Yonsei University, Seoul, Republic of Korea.
authors.forename: Sungkeun
authors.initials: S
authors.lastname: Shim
authors.affiliation: Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, Republic of Korea.|Institute on Aging, Ajou University Medical Center, Suwon, Republic of Korea.
authors.forename: Jinhee
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, Republic of Korea.|Institute on Aging, Ajou University Medical Center, Suwon, Republic of Korea.
authors.forename: Doukyoung
authors.initials: D
authors.lastname: Chon
authors.affiliation: Institute of Health Services Research, Yonsei University, Seoul, Republic of Korea.|Department of Hospital management, Graduate School of Public Health, Yonsei University, Seoul, Republic of Korea.
authors.forename: Sang-Gue
authors.initials: SG
authors.lastname: Lee
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000150:complications*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009749:Nutrition Surveys; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D057566:Self Report; D017678:Sex Distribution; D012890:Sleep; D012893:Sleep Wake Disorders / Q000453:epidemiology*
keywords: Sleep disturbance; rheumatoid arthritis; sleep