title: Subjective sleep quality in non-demented older adults with and without cognitive impairment.
abstract: OBJECTIVE
  Sleep problems are prevalent among older adults who are at risk of developing dementia. Until now, there have been relatively few studies investigating subjective sleep quality in these individuals. The first objective of this study was to compare seniors with cognitive impairment no dementia (CIND) and older adults without cognitive impairment (non-CIND) on several subjective sleep measures. The second objective was to verify whether sleep parameters associated with CIND differ between men and women.
  
  
  METHODS
  The population sample consisted of 2287 French-speaking older adults from Québec (Canada) aged between 65 and 96 years. Participants were classified as CIND or non-CIND on the basis of their mini mental state examination score using sex, age, and education-stratified normative data. All participants completed the Pittsburgh Sleep Quality Index, and responses of CIND and non-CIND individuals were compared. A series of confounding variables (age, education, chronic diseases, mood disorders, anxiety disorders, and use of psychotropic drugs) were statistically controlled for. Student's t-tests were performed to compare characteristics of CIND and non-CIND individuals; data from male and female participants were analyzed separately. Moreover, the association between each sleep variable and CIND was measured by odds ratios based on logistic regression.
  
  
  RESULTS
  On the whole, analyses revealed no significant association between subjective sleep parameters and CIND. Moreover, no difference was observed between men and women regarding subjective sleep quality.
  
  
  CONCLUSIONS
  Overall, these results suggest that subjective measures of sleep do not allow differentiating cognitively impaired older individuals from those with normal cognition.
authors: Centre de recherche de l'Institut universitaire en santé mentale de Québec, Québec, Canada; Université Laval, Québec, Canada.
authors: Anne-Marie
authors: AM
authors: Adam
authors: Olivier
authors: O
authors: Potvin
authors: Brandy L
authors: BL
authors: Callahan
authors: Célyne
authors: C
authors: Bastien
authors: Dominique
authors: D
authors: Lorrain
authors: Sophie
authors: S
authors: Desjardins
authors: Hélène
authors: H
authors: Forget
authors: Michel
authors: M
authors: Préville
authors: Carol
authors: C
authors: Hudon
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002170:Canada; D003072:Cognition Disorders / Q000503:physiopathology*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D012737:Sex Factors; D012890:Sleep / Q000502:physiology*; D012893:Sleep Wake Disorders / Q000523:psychology
keywords: Pittsburgh Sleep Quality Index; aging; cognitive impairment no dementia; mild cognitive impairment; population study; sleep