title: The reliability of passively collected AIDS surveillance data in Massachusetts.
abstract: OBJECTIVE
  To determine the reliability of demographic, clinical, and treatment information collected during routine AIDS surveillance.
  
  
  METHODS
  Information from the medical records of a random sample of 212 AIDS cases reported to the Massachusetts Department of Public Health between November 1993 and November 1994 was compared with that from the original case reports. We assessed levels of agreement by calculating overall percent agreement and kappa statistics with 95% confidence limits. We used an intraclass correlation coefficient to compare the CD4+ lymphocyte count reported from the two sources.
  
  
  RESULTS
  There was excellent agreement for gender (kappa = 0.97) and race (kappa = 0.87). Agreement was lower for transmission mode (kappa = 0.73), CD4+ cell count (ICC = 0.76) and category of AIDS case definition (kappa = 0.59). There was poor agreement for use of antiretrovirals (kappa = 0.23), use of prophylaxis for Pneumocystis carinii pneumonia (kappa = 0.12) and vital status (kappa = 0.22). The month and year of diagnosis agreed in only 55% of cases reviewed.
  
  
  CONCLUSIONS
  Routine AIDS surveillance data was reliable for demographic variables, but less reliable for information about clinical events, laboratory findings, or treatment. Future AIDS surveillance efforts should improve the collection of these data by using sources where this information is more reliable.
authors.affiliation: Massachusetts Department of Public Health, AIDS Surveillance Program, Boston, USA. kxg7@cdc.gov
authors.forename: Kathleen M
authors.initials: KM
authors.lastname: Gallagher
authors.forename: Michele
authors.initials: M
authors.lastname: Jara
authors.forename: Alfred
authors.initials: A
authors.lastname: Demaria
authors.forename: George R
authors.initials: GR
authors.lastname: Seage
authors.forename: Timothy
authors.initials: T
authors.lastname: Heeren
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology; D019380:Anti-HIV Agents / Q000627:therapeutic use; D018791:CD4 Lymphocyte Count; D005260:Female; D006801:Humans; D008297:Male; D008404:Massachusetts / Q000453:epidemiology; D011159:Population Surveillance; D015203:Reproducibility of Results
chemical_list: D019380:Anti-HIV Agents