Health care utilization by people with HIV on release from provincial prison in Ontario, Canada in 2010: a retrospective cohort study.

Limited evidence suggests that at the time of release from prison, people with HIV face barriers to health care, which may contribute to worsening HIV clinical outcomes. We aimed to describe health care utilization for people with HIV released from provincial prison in Ontario in 2010, and to compare rates of use with prisoner and general population controls. We used Ontario's administrative health records and data from the Ontario Ministry of Community Safety and Correctional Services on all persons released from provincial prison in 2010. We matched each person with HIV released from provincial prison by age and sex with three controls in each of three groups: people with no HIV released from provincial prison, people with HIV in the general population, and people with no HIV in the general population. We compared rates of use of primary care, non-primary ambulatory care, emergency departments, and hospitalization in the year after the first release from provincial prison in 2010 and in the corresponding period for matched controls. We identified 330 persons with HIV released from provincial prison in 2010. Their median time to first HIV-ambulatory care visit after prison release was 177 days (SD 136-239). Compared to all control groups, people with HIV released from provincial prison had higher rates of primary care use, unscheduled emergency department visits and hospital admissions at 30, 90 and 365 days after release. People with HIV released from provincial prison have a long time to first contact with HIV ambulatory care, and higher rates of health care utilization across health care settings. Interventions are required to facilitate post-release linkage to care for this population.

A comparison of the observed and expected prevalence of HIV in persons released from Ontario provincial prisons in 2010.

OBJECTIVE: To estimate the prevalence of HIV infection in persons released from Ontario prisons in 2010 using administrative health data, and to compare this observed prevalence with the expected prevalence based on the most recently available biological sampling data. METHODS: We linked identifying data for all adults released from Ontario provincial prisons in 2010 with administrative health data, and applied a validated algorithm to determine the observed HIV prevalence. We calculated the expected HIV prevalence using 2003-2004 age stratum-specific data from a published study using salivary sampling. We calculated an indirect standardized prevalence ratio of the observed to expected prevalence and 95% confidence intervals. Finally, we conducted sensitivity analyses to adjust for the sensitivity of the algorithm to identify persons with HIV and for undiagnosed HIV infection. RESULTS: Of 52,313 persons released from Ontario prisons in 2010, we identified 363 persons with HIV, for an observed prevalence of 0.69%. The expected prevalence was 2.38%. Standardized for age, we found a prevalence ratio of 0.29 (95% CI, 0.17-0.77). Sensitivity analyses adjusting for the algorithm's sensitivity and further adjusting for undiagnosed HIV infection produced standardized prevalence ratios of 0.30 and 0.38, respectively. CONCLUSION: Our findings suggest that a high proportion of persons with HIV recently released from provincial prisons either do not know they have HIV infection or do know about their infection but are not engaged in care. Interventions are required to screen people for HIV in prison and to link persons with care following release.

Correction to: A comparison of the observed and expected prevalence of HIV in persons released from Ontario provincial prisons in 2010.

The Acknowledgements section was inadvertently omitted from this article; it appears in its entirety below.