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M94A2072.TXT
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1994-10-24
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Document 2072
DOCN M94A2072
TI Constructing a sampling framework for homosexual gathering places as an
alternative to convenience samples to determine risk behaviors in
Tijuana, Mexico.
DT 9412
AU Rangel-Gomez G; Izazola-Lioea JA; del Rio C; Bustamante J; El Colegio de
la Frontera Norte, Mexico.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):388 (abstract no. PD0161). Unique
Identifier : AIDSLINE ICA10/94370503
AB OBJECTIVES. To describe a method to build a sampling framework of gay
gathering places to conduct probability surveys instead of convenience
samples, to determine populations at risk for HIV, and other risk
estimators. METHODS. A bi-dimensional multi-step sampling framework for
mobile populations was built. Each step had selection units of place,
time (day and hour) that had a given probability of being selected.
Weighing factors of the sampling units come from the probability to
select: A) persons (gay and bisexual men), B) geographic units (bars)
and C) time (day and hour). The main assumption is that gay and bisexual
men are mobile units, moving in place and time according to the moment
they visit gay gathering places (bars). This methodology has been
previously used to determine a) an estimate of the number tourists in a
resort area in Baja California, Mex., and 2) to estimate the number of
migrants of Mexicans to the United States. 221 questionnaires were
administered to determine risk behaviors and blood was drawn to
determine HIV prevalence. RESULTS. The original model of analysis has
been modified and the number of people attending gay gathering places in
Tijuana will be finally estimated as an absolute number. The
distribution of risk behaviors will be estimated from the relative
frequencies of the sample estimates. There were additional problems to
those found in the other two studies, for instance, there was a lot of
movement from one bar to another in the same day and hour (some people
visited more than 3 bars in one hour), initial non-responses were
delayed and people looked for being interviewed later, and even if they
were not in the selected time and place, etc. Sample estimates have not
yet been translated to the population level. Some sample estimates are:
18% reported to have used condoms always in the past year, 12% have
never used it in that period. The overall prevalence rate of HIV
infection is 10.5%, and there is a significant higher rate for those who
did not used a condom in the past year (23%). CONCLUSIONS. This
methodology allows the direct estimation of the size of the population
under study: gay and bisexual men attending gathering places, with
statistical representativeness.
DE Condoms *Developing Countries *Homosexuality Human HIV
Infections/EPIDEMIOLOGY/*PREVENTION & CONTROL/TRANSMISSION HIV
Seroprevalence Knowledge, Attitudes, Practice Male
Mexico/EPIDEMIOLOGY Risk Factors Sampling Studies *Sex Behavior
*Social Environment MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).