title: A probability sample for monitoring the HIV-infected population in care in the U.S. and in selected states.
abstract: Epidemiologic and clinical changes in the HIV epidemic over time have presented a challenge to public health surveillance to monitor behavioral and clinical factors that affect disease progression and HIV transmission. The Medical Monitoring Project (MMP) is a supplemental surveillance project designed to provide representative, population-based data on clinical status, care, outcomes, and behaviors of HIV-infected persons receiving care at the national level. We describe a three-stage probability sampling method that provides both nationally and state-level representative estimates.In stage-I, 20 states, which included 6 separately funded cities/counties, were selected using probability proportional to size (PPS) sampling. PPS sampling was also used in stage-II to select facilities for participation in each of the 26 funded areas. In stage-III, patients were randomly selected from sampled facilities in a manner that maximized the possibility of having overall equal selection probabilities for every patient in the state or city/county. The sampling methods for MMP could be adapted to other research projects at national or sub-national levels to monitor populations of interest or evaluate outcomes and care for a range of specific diseases or conditions.
authors.affiliation: Baruch College, The City University of New York, New York City, New York, USA.
authors.forename: Martin R
authors.initials: MR
authors.lastname: Frankel
authors.forename: Ad
authors.initials: A
authors.lastname: McNaghten
authors.forename: Martin F
authors.initials: MF
authors.lastname: Shapiro
authors.forename: Patrick S
authors.initials: PS
authors.lastname: Sullivan
authors.forename: Sandra H
authors.initials: SH
authors.lastname: Berry
authors.forename: Christopher H
authors.initials: CH
authors.lastname: Johnson
authors.forename: Elaine W
authors.initials: EW
authors.lastname: Flagg
authors.forename: Sally
authors.initials: S
authors.lastname: Morton
authors.forename: Samuel A
authors.initials: SA
authors.lastname: Bozzette