title: Synchrony of change in depressive symptoms, health status, and quality of life in persons with clinical depression.
abstract: BACKGROUND
  Little is known about longitudinal associations among measures of depression, mental and physical health, and quality of life (QOL). We followed 982 clinically depressed persons to determine which measures changed and whether the change was synchronous with change in depressive symptoms.
  
  
  METHODS
  Data were from the Longitudinal Investigation of Depression Outcomes (LIDO). Depressive symptoms, physical and mental health, and quality of life were measured at baseline, 6 weeks, 3 months, and 9 months. Change in the measures was examined over time and for persons with different levels of change in depressive symptoms.
  
  
  RESULTS
  On average, all of the measures improved significantly over time, and most were synchronous with change in depressive symptoms. Measures of mental health changed the most, and physical health the least. The measures of change in QOL were intermediate. The 6-week change in QOL could be explained completely by change in depressive symptoms. The instruments varied in sensitivity to changes in depressive symptoms.
  
  
  CONCLUSIONS
  In clinically depressed persons, measures of physical health, mental health, and quality of life showed consistent longitudinal associations with measures of depressive symptoms.
authors.affiliation: Department of Biostatistics F-670 HSB, Box 357232, University of Washington, Seattle, WA 98195-7232, USA. pdiehr@u.washington.edu
authors.forename: Paula H
authors.initials: PH
authors.lastname: Diehr
authors.forename: Ann M
authors.initials: AM
authors.lastname: Derleth
authors.forename: Stephen P
authors.initials: SP
authors.lastname: McKenna
authors.forename: Mona L
authors.initials: ML
authors.lastname: Martin
authors.forename: Donald M
authors.initials: DM
authors.lastname: Bushnell
authors.forename: Gregory
authors.initials: G
authors.lastname: Simon
authors.forename: Donald L
authors.initials: DL
authors.lastname: Patrick
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003866:Depressive Disorder / Q000503:physiopathology* / Q000523:psychology / Q000628:therapy; D005260:Female; D006304:Health Status; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011788:Quality of Life; D018434:Sickness Impact Profile; D016896:Treatment Outcome