title: Intensive use of mental health care.
abstract: OBJECTIVE
  To describe the profile of the intensive use of mental health services over a 4-year period in a population of 1.1 million people.
  
  
  METHODS
  Data obtained from computerized hospital separation records and physician reimbursement claims were combined to form patient-based histories of mental health care utilization. Users of mental health services in a 24-month period were hierarchically classified as having a psychotic disorder (ICD-9-CM 295-299) or a nonpsychotic disorder (ICD-9-CM 300-301, 306-309, 311). Intensive use was defined as 12 or more contact months or a minimum of 2 episodes of therapy in the 24-month period. The cohort of intensive users were followed over the subsequent 24-month interval to describe the persistence of intensive use.
  
  
  RESULTS
  In the initial observation periods, intensive users constituted 27.4% of individuals in treatment for psychotic disorder and 4.4% of persons in treatment for nonpsychotic disorder. These 2 groups, which represent 7.4% of all users of mental health care, were responsible for 53% of physician services, 72.7% of contacts with psychiatrists, and 64.4% of acute psychiatric bed days in the initial period. In the follow-up period, intensive use status was replicated by 44.6% of the cohort.
  
  
  CONCLUSIONS
  The diagnostic and therapeutic characteristics of intensive users of mental health services are heterogeneous. There is substantial persistence of intensive mental health service use over time.
authors.affiliation: Department of Community Health Sciences, Faculty of Medicine, University of Manitoba, Winnipeg.
authors.forename: C A
authors.initials: CA
authors.lastname: Mustard
authors.forename: S
authors.initials: S
authors.lastname: Derksen
authors.forename: D
authors.initials: D
authors.lastname: Tataryn
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D005500:Follow-Up Studies; D006300:Health Services Misuse / Q000706:statistics & numerical data*; D006801:Humans; D015994:Incidence; D008297:Male; D008350:Manitoba / Q000453:epidemiology; D001523:Mental Disorders / Q000453:epidemiology* / Q000523:psychology / Q000534:rehabilitation; D008605:Mental Health Services / Q000706:statistics & numerical data*; D008875:Middle Aged; D010343:Patient Admission / Q000706:statistics & numerical data; D010348:Patient Care Team / Q000706:statistics & numerical data; D010359:Patient Readmission / Q000706:statistics & numerical data; D011618:Psychotic Disorders / Q000453:epidemiology / Q000523:psychology / Q000534:rehabilitation; D016896:Treatment Outcome