Consequences of adult HIV infection for outpatient morbidity and treatment costs: a prospective study in a factory clinic in Tanzania

Health Policy Plan. 1997 Sep;12(3):234-9. doi: 10.1093/heapol/12.3.234.

Abstract

Most studies of the medical costs of HIV infection focus on the terminal stage of this chronic illness when the patients have developed AIDS or severe HIV disease and in-patient care dominates. Data are also needed on the medical costs during the prolonged phase of HIV infection preceding severe terminal illness and the effects it may have on the provision of outpatient care. The study population was derived from a cohort study of factory workers and their spouses in Tanzania. Morbidity and outpatient health services utilization are estimated for 1832 adults who on average had been enrolled for two years and utilized the study clinic. Among those who had been enrolled at least 2 years, 50 cases (HIV+ since enrollment) and 150 control (HIV- until last visit) were selected, matched by age, sex and income level to estimate expenditure on drugs by HIV status. There was an increase in morbidity during HIV infection: the incidence of clinical diagnoses was 30% higher among HIV-positive than among HIV-negative adults (p < 0.001). HIV-infected adults also made more frequent use of the outpatient services (23% higher utilization). Estimates of essential drug costs among the subsample showed a 15% increase for HIV infected adults compared to HIV-negative adults, caused by higher use of antibiotics and other antimicrobial drugs. The overall increase in morbidity, outpatient care services utilization and essential drug use due to HIV infection was limited, as HIV prevalence in this adult population was 11%. For example, the net proportion of all illness episodes attributable to HIV infection was 3.2%. Possible biases are discussed and suggest that our findings are a minimum estimate of the effect of adult HIV infection on outpatient care costs. There is a need for more studies in different settings to assess the impact of HIV infection on outpatient care in developing countries.

PIP: Morbidity and outpatient health services utilization are estimated for 1832 adult factory workers and their spouses in Tanzania who had on average been enrolled at the study clinic for at least 2 years and used the clinic. A subsample of 50 cases HIV-positive since enrollment and 150 controls HIV-negative up to the most recent visit was selected, matched by age, sex, and income level to estimate expenditure on drugs by HIV status. An increase in morbidity was observed during HIV infection, with the incidence of clinical diagnoses 30% higher among HIV-positive than among HIV-negative adults. HIV-infected adults also used outpatient services 23% more often than did controls. Estimates of essential drug costs among the subsample showed a 15% increase for HIV-infected adults compared to HIV-negative adults. However, the net proportion of all illness episodes attributable to HIV infection was only 3.2%. These findings likely represent a minimum estimate of the effect of adult HIV infection on outpatient care costs.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • AIDS-Related Opportunistic Infections / economics
  • AIDS-Related Opportunistic Infections / epidemiology
  • AIDS-Related Opportunistic Infections / therapy
  • Adult
  • Ambulatory Care / statistics & numerical data*
  • Cohort Studies
  • Cost of Illness*
  • Developing Countries
  • Drug Costs
  • Female
  • HIV Infections / economics
  • HIV Infections / epidemiology*
  • HIV Infections / therapy
  • Humans
  • Industry
  • Male
  • Morbidity
  • Prospective Studies
  • Tanzania / epidemiology