title: Subjective memory complaints in an elderly population with poor sleep quality.
abstract: The association between sleep disturbances and cognitive decline in the elderly has been putative and controversial. We evaluated the relation between subjective sleep quality and cognitive function in the Korean elderly.
  
  
  
  Among 459 community-dwelling subjects, 352 subjects without depression or neurologic disorders (mean age 68.2 ± 6.1) were analyzed in this study. All the participants completed the Korean version of the consortium to establish a registry for Alzheimer's disease neuropsychological battery (CERAD-KN) as an objective cognitive measure and subjective memory complaints questionnaire (SMCQ). Based on the Pittsburgh sleep quality index, two types of sleepers were defined: 'good sleepers' and 'poor sleepers'.
  
  
  
  There were 192 good sleepers (92 men) and 160 poor sleepers (51 men). Poor sleepers reported more depressive symptoms and more use of sleep medication, and showed higher SMCQ scores than good sleepers, but there was no difference in any assessments of CERAD-KN. In the regression analysis, depressive symptoms and subjective sleep quality were associated with subjective memory complaints (β = 0.312, p < 0.001; β = 0.163, p = 0.005).
  
  
  
  In the elderly without depression, poor sleep quality was associated with subjective memory complaints, but not with objective cognitive measures. As subjective memory complaints might develop into cognitive disorders, poor sleep quality in the elderly needs to be adequately controlled.
authors.affiliation: a Department of Psychiatry , Veterans Health Service Medical Center , Seoul , Korea.|b Department of Medicine , Graduate School of Yonsei University , Seoul , Korea.
authors.forename: Suk-Hoon
authors.initials: SH
authors.lastname: Kang
authors.affiliation: c Department of Neuropsychiatry , Seoul National University Bundang Hospital , Gyeonggi-do , Korea.|d Department of Psychiatry , Seoul National University College of Medicine , Seoul , Korea.
authors.forename: In-Young
authors.initials: IY
authors.lastname: Yoon
authors.affiliation: e Department of Psychiatry , Korean Armed Forces Capital Hospital , Gyeonggi-do , Korea.
authors.forename: Sang Don
authors.initials: SD
authors.lastname: Lee
authors.affiliation: c Department of Neuropsychiatry , Seoul National University Bundang Hospital , Gyeonggi-do , Korea.
authors.forename: Tae
authors.initials: T
authors.lastname: Kim
authors.affiliation: c Department of Neuropsychiatry , Seoul National University Bundang Hospital , Gyeonggi-do , Korea.
authors.forename: Chung Suk
authors.initials: CS
authors.lastname: Lee
authors.affiliation: c Department of Neuropsychiatry , Seoul National University Bundang Hospital , Gyeonggi-do , Korea.
authors.forename: Ji Won
authors.initials: JW
authors.lastname: Han
authors.affiliation: c Department of Neuropsychiatry , Seoul National University Bundang Hospital , Gyeonggi-do , Korea.|d Department of Psychiatry , Seoul National University College of Medicine , Seoul , Korea.
authors.forename: Ki Woong
authors.initials: KW
authors.lastname: Kim
authors.affiliation: b Department of Medicine , Graduate School of Yonsei University , Seoul , Korea.
authors.forename: Chan-Hyung
authors.initials: CH
authors.lastname: Kim
mesh_terms: D000368:Aged; D000375:Aging / Q000523:psychology*; D016022:Case-Control Studies; D060825:Cognitive Dysfunction / Q000209:etiology*; D003863:Depression / Q000150:complications; D056344:Executive Function; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008569:Memory Disorders / Q000209:etiology*; D008875:Middle Aged; D009483:Neuropsychological Tests; D012044:Regression Analysis; D056910:Republic of Korea; D000068776:Sleep Aids, Pharmaceutical / Q000627:therapeutic use; D012893:Sleep Wake Disorders / Q000150:complications*; D011795:Surveys and Questionnaires
chemical_list: D000068776:Sleep Aids, Pharmaceutical
keywords: Elderly; cognitive disorders; poor sleep quality; subjective memory complaints