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Iachan R, Johnson CH, Harding RL, et al. Design and Weighting Methods for a Nationally Representative Sample of HIV-infected Adults Receiving Medical Care in the United States-Medical Monitoring Project. Open AIDS J. 2016;10:164-81doi: 10.2174/1874613601610010164.
Iachan, R., Johnson, C. H., Harding, R. L., Kyle, T., Saavedra, P., Frazier, E. L., Beer, L., Mattson, C. L., & Skarbinski, J. (2016). Design and Weighting Methods for a Nationally Representative Sample of HIV-infected Adults Receiving Medical Care in the United States-Medical Monitoring Project. The open AIDS journal, 10164-81. https://doi.org/10.2174/1874613601610010164
Iachan, Ronaldo, et al. "Design and Weighting Methods for a Nationally Representative Sample of HIV-infected Adults Receiving Medical Care in the United States-Medical Monitoring Project." The open AIDS journal vol. 10 (2016): 164-81. doi: https://doi.org/10.2174/1874613601610010164
Iachan R, Johnson CH, Harding RL, Kyle T, Saavedra P, Frazier EL, Beer L, Mattson CL, Skarbinski J. Design and Weighting Methods for a Nationally Representative Sample of HIV-infected Adults Receiving Medical Care in the United States-Medical Monitoring Project. Open AIDS J. 2016 Aug 19;10:164-81. doi: 10.2174/1874613601610010164. eCollection 2016. PMID: 27651851; PMCID: PMC5013474.
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Open AIDS J. 2016 Aug 19;10:164-81. doi: 10.2174/1874613601610010164. eCollection 2016.

Design and Weighting Methods for a Nationally Representative Sample of HIV-infected Adults Receiving Medical Care in the United States-Medical Monitoring Project.

The open AIDS journal

Ronaldo Iachan, Christopher H Johnson, Richard L Harding, Tonja Kyle, Pedro Saavedra, Emma L Frazier, Linda Beer, Christine L Mattson, Jacek Skarbinski

Affiliations

  1. ICF International, Inc., Calverton, MD, USA.
  2. Division of HIV/AIDS Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA.

PMID: 27651851 PMCID: PMC5013474 DOI: 10.2174/1874613601610010164

Abstract

BACKGROUND: Health surveys of the general US population are inadequate for monitoring human immunodeficiency virus (HIV) infection because the relatively low prevalence of the disease (<0.5%) leads to small subpopulation sample sizes.

OBJECTIVE: To collect a nationally and locally representative probability sample of HIV-infected adults receiving medical care to monitor clinical and behavioral outcomes, supplementing the data in the National HIV Surveillance System. This paper describes the sample design and weighting methods for the Medical Monitoring Project (MMP) and provides estimates of the size and characteristics of this population.

METHODS: To develop a method for obtaining valid, representative estimates of the in-care population, we implemented a cross-sectional, three-stage design that sampled 23 jurisdictions, then 691 facilities, then 9,344 HIV patients receiving medical care, using probability-proportional-to-size methods. The data weighting process followed standard methods, accounting for the probabilities of selection at each stage and adjusting for nonresponse and multiplicity. Nonresponse adjustments accounted for differing response at both facility and patient levels. Multiplicity adjustments accounted for visits to more than one HIV care facility.

RESULTS: MMP used a multistage stratified probability sampling design that was approximately self-weighting in each of the 23 project areas and nationally. The probability sample represents the estimated 421,186 HIV-infected adults receiving medical care during January through April 2009. Methods were efficient (i.e., induced small, unequal weighting effects and small standard errors for a range of weighted estimates).

CONCLUSION: The information collected through MMP allows monitoring trends in clinical and behavioral outcomes and informs resource allocation for treatment and prevention activities.

Keywords: HIV infection; Nonresponse; Probability sampling; Surveillance; Survey methodology; Weighting

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