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Table 4 Ascertainment of mental health conditions (given the context of our cohort, we excluded substance use and alcohol use disorder which were included in the source definition) [26]

From: Engagement in primary health care among marginalized people who use drugs in Ottawa, Canada

At least one hospitalization (CIHI-DAD or OMHRS) or ambulatory visit (NACRS) in the past 10 years with a diagnosis of ANY of the below diagnostic codes

OR

At least two visits in the past two years with a mental health diagnostic code (OHIP)

Mental health diagnostic (ICD-9) codes:

Psychotic Disorders

295 Schizophrenia

296 Manic-depressive psychoses, involutional melancholia

297 Other paranoid states

298 Other psychoses

Non-Psychotic Disorders

300 Anxiety neurosis, hysteria, neurasthenia, obsessive-compulsive neurosis, reactive depression

301 Personality disorders

302 Sexual deviations

306 Psychosomatic illness

309 Adjustment reaction

311 Depressive disorder

Social Problems

897 Economic problems

898 Marital difficulties

899 Parent-child problems

900 Problems with aged parents or in-laws

901 Family disruption/divorce

902 Education problems

904 Social maladjustment

905 Occupational problems

906 Legal problems

909 Other problems of social adjustment

  1. Ascertainment of HIV [27]
  2. 3 physician claims (International Classification of Diseases, Ninth Revision (ICD-9) code for HIV infection (042, 043, 044)) over a 3-year period (sensitivity and specificity of 96.2% (95% CI 95.2–97.9%) and 99.6% (95% CI 99.1–99.8%))