title: Correlates of using mental health services: implications of using alternative definitions.
abstract: BACKGROUND
  Studies using varying definitions of mental health visits result in widely divergent estimates. This analysis examines the stability of a predictive model using three varying definitions based on provider type, diagnosis, psychotherapy, and psychotropic medication use.
  
  
  METHODS
  Interview and questionnaire data and claims records from the RAND Health Insurance Experiment are used to test these models among 3138 enrollees.
  
  
  RESULTS
  Estimates of visits, and factors associated with them, are highly sensitive to definitions. Depression was the only symptom/life situation variable, and education the only sociodemographic measure, predictive across all three models. Risk indicators such as suicide thoughts and drinking problems were only significant for the traditional (mental health specialty) model. While patients within the traditional model definition were significantly younger than other enrollees, those within the model using the most expansive definition were significantly older. Varying the definition also led to different results in respect to experimental manipulations, geographic sites and some specific types of comorbidity.
  
  
  CONCLUSIONS
  A reasonable definition, consistent with medical standards, requires, at least, a mental health diagnostic judgment and some form of psychotherapeutic or drug treatment. Studies of the content of mental health care are needed.
authors.affiliation: Institute for Health, Health Care Policy, and Aging Research, New Brunswick, NJ 08903.
authors.forename: D
authors.initials: D
authors.lastname: Mechanic
authors.forename: R J
authors.initials: RJ
authors.lastname: Angel
authors.forename: L
authors.initials: L
authors.lastname: Davies
mesh_terms: D000328:Adult; D015897:Comorbidity; D005069:Evaluation Studies as Topic; D006281:Health Occupations / Q000145:classification / Q000706:statistics & numerical data; D006302:Health Services Research; D006305:Health Status Indicators; D006801:Humans; D016015:Logistic Models; D001523:Mental Disorders / Q000453:epidemiology / Q000523:psychology* / Q000628:therapy; D008605:Mental Health Services / Q000706:statistics & numerical data*; D010342:Patient Acceptance of Health Care; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data; D011237:Predictive Value of Tests; D011613:Psychotherapy / Q000706:statistics & numerical data; D011619:Psychotropic Drugs / Q000627:therapeutic use; D015203:Reproducibility of Results; D012959:Socioeconomic Factors; D014481:United States / Q000453:epidemiology
chemical_list: D011619:Psychotropic Drugs