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International News

Uncertainties of Incidence Estimates of HIV/AIDS Diagnoses Adjusted

June 1, 2005

According to the current study, "Reporting delay occurs frequently in the case surveillance of a disease such as HIV/AIDS. To evaluate the current trend of incidence, it is important to consider incidence estimates adjusted for reporting delays and the uncertainty associated with this adjustment. For a surveillance system in which cases are reported monthly, there is no straightforward method for constructing the confidence interval estimators for annual incidence or incidence for a period longer than a month. This is because the monthly incidence estimators are not independent and the correlations among them are not available."

"Furthermore," according to Ruiguang Song and colleagues at CDC, "to estimate the incidence for a specific risk or exposure group (e.g., men who have sex with men), we also have to consider the uncertainty associated with the counts from cases reported without an identified risk. Cases with no reported risk are assigned proportionally to each risk group on the basis of experience with cases reported initially with no reported risk but reported later with an identified risk."

"In this article, we introduce a method for combining the uncertainties associated with both reporting delay and risk redistribution," the scientists stated. "An estimator for the covariance between two incidence estimators is also provided so that we can make pairwise comparisons and discover any significant changes in incidence over time. Results are applied to evaluating the current trends in AIDS incidence among men who have sex with men in the United States."

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The report, "Uncertainties Associated with Incidence Estimates of HIV/AIDS Diagnoses Adjusted for Reporting Delay and Risk Redistribution," appeared in Statistics in Medicine (2005;24(3):453-464).

Back to other news for June 1, 2005

Adapted from:
AIDS Weekly & Law
04.07.05


  
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This article was provided by CDC National Prevention Information Network. It is a part of the publication CDC HIV/Hepatitis/STD/TB Prevention News Update.
 
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