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Open Access Research article

Physician's manual reporting underestimates mortality: evidence from a population-based HIV/AIDS treatment program

Christopher G Au-Yeung1, Aranka Anema12, Keith Chan1, Benita Yip1, Julio SG Montaner12 and Robert S Hogg13*

Author Affiliations

1 British Columbia Centre for Excellence in HIV/AIDS, Vancouver, British Columbia, Canada

2 Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada

3 Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada

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BMC Public Health 2010, 10:642  doi:10.1186/1471-2458-10-642

Published: 25 October 2010

Abstract

Background

In clinical and cohort research, mortality estimates are often derived from manual reports generated by physicians or electronic reports from vital event registries. We examined the rate of underreporting of deaths by manual methods as compared with electronic reports from a vital event registry.

Methods

The retrospective analyses included deaths among participants registered in an observational cohort who initiated highly-active antiretroviral therapy (HAART) between August 1, 1996 and June 30, 2006. Deaths were routinely reported manually by physicians and through annual electronic record linkages with a population-based vital event registry. Multivariate logistic regression was carried out to assess independent predictors of death reporting by manual methods.

Results

Of the 3,116 individuals included in the analyses, 622 (20.0%) died during follow-up. Manual reporting by physicians only identified 377 (60.6%), while electronic linkages captured 598 (96.1%) of all deaths. Multivariate analysis indicated that deaths among individuals with lower CD4 cell count, higher HIV plasma viral load, a history of injection drug use, and under the care of an HIV-experienced physicians were more likely to be reported manually. Furthermore, non-accidental deaths were more likely to be reported manually, and manual reporting of deaths increased over time.

Conclusions

Relying only on manual reports to ascertain deaths significantly underestimates the total number of deaths in the population. This can generate important biases when evaluating the impact of therapeutic interventions in the populational setting.