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Estimates for MSM and IDU Populations

December 19, 2012

Using meta-analysis with behavioral data from population-based surveys, CDC found that men who engaged in same-sex behavior in the past five years comprised 3.9% (3.5 - 4.4) of the U.S. adult male population. Men who recall ever engaging in same-sex behavior comprised 6.9% (5.1-8.6) of the U.S. adult male population. In a recent publication, CDC used the 5-year estimate as a conservative, mid-range estimate of the size of the MSM population. Compared to other men and women, HIV rates among MSM were 38 to 75 times as high, and syphilis rates were 63 to 109 times as high.

Similar to the MSM population size estimate, CDC conducted a meta-analysis of behavioral data from national surveys to estimate the number of persons in the U.S. who have injected drugs to use as a denominator to calculate HIV diagnosis and prevalence rates for IDU.

The meta-analysis estimated that lifetime IDU comprise 2.6% (95% confidence interval (CI): 1.8% - 3.3%) of the U.S. population age 13 years or older; the past-year IDU estimate was 0.30% (95% CI: 0.19 % - 0.41%). Comparing black IDU to white IDU, the rate of HIV diagnosis was nearly 15 times as high; comparing Hispanic/Latino to white IDU, the rate was more than 9 times as high.

CDC continues to work on developing national estimates of population sizes for other transmission categories (MSM/IDU and heterosexual contact). Given the need for comparability across groups, it is expected that disease rates by transmission category will be calculated based on the "ever" behavioral recall period for all groups, including MSM.

National estimates of population sizes can be used to provide a broader understanding of the HIV epidemic among those at risk for transmission and acquisition of HIV. These estimates and disease rate calculations also provide important tools for monitoring and characterizing the HIV epidemic in the United States as well as planning and optimizing the allocation of resources to programs serving disproportionately affected populations and addressing health inequities. As such, they can be helpful in implementing and monitoring the National HIV/AIDS Strategy.

The MSM article is available at here.

The IDU poster presentation may be viewed here.



  
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This article was provided by U.S. Centers for Disease Control and Prevention. Visit the CDC's website to find out more about their activities, publications and services.
 
See Also
More Statistics on Gay Men, HIV/AIDS and Other STDs in the U.S.

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