title: Design characteristics that influence attrition in geriatric antidepressant trials: meta-analysis.
abstract: OBJECTIVE
  To identify study-level and treatment group-level characteristics that are associated with attrition in antidepressant trials for the depressed elderly.
  
  
  METHODS
  This meta-analysis used 68 published antidepressant randomized trials for the elderly depressed. Study-level and treatment group-level variables were extracted. The former consisted of: use of placebo arm, number of arms, unbalanced treatment allocation, year conducted, study duration, study location, number of centers, and patient pool. The latter consisted of: assigned treatments, baseline mean Hamilton Depression Rating Scale (HDRS), baseline mean age, gender ratio, attrition size, and sample size. Univariate logistic regressions with attrition as the dependent variable were applied, followed by application of a forward stepwise selection method for identification of independent attrition correlates.
  
  
  RESULTS
  The 68 studies had a total of 153 treatment groups and 8,385 subjects. Among them, 2,287 subjects were terminated early, resulting in an overall 27.3% attrition rate. The stepwise results showed that higher attrition was significantly associated with active antidepressant groups as opposed to placebo groups, higher baseline HDRS, smaller sample size, unbalanced allocation of treatments, longer duration, and studies conducted in USA.
  
  
  CONCLUSIONS
  The attrition in geriatric antidepressant trials can be affected by study and group-level design characteristics that include severity of depression symptoms and active treatments among others.
authors.affiliation: Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY 10461, USA. mheo@aecom.yu.edu
authors.forename: Moonseong
authors.initials: M
authors.lastname: Heo
authors.forename: Eros
authors.initials: E
authors.lastname: Papademetriou
authors.forename: Barnett S
authors.initials: BS
authors.lastname: Meyers
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000928:Antidepressive Agents / Q000627:therapeutic use*; D003866:Depressive Disorder / Q000188:drug therapy*; D005260:Female; D005853:Geriatrics; D006801:Humans; D008297:Male; D008875:Middle Aged; D010352:Patient Dropouts / Q000706:statistics & numerical data*; D010919:Placebos / Q000627:therapeutic use; D016032:Randomized Controlled Trials as Topic
chemical_list: D000928:Antidepressive Agents; D010919:Placebos