Author: Fisher Dennis G. Reynolds Grace L.
Publisher: Springer Publishing Company
ISSN: 1099-3460
Source: Journal of Urban Health: Bulletin of the New York Academy of Medicine, Vol.79, Iss.1, 2002-03, pp. : 128-135
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Abstract
Participation bias (selection bias) may be a problem in studies that attempt to evaluate the effects of needle-exchange programs (NEPs). The present study looked at only those injection drug users (IDUs) who were randomly placed in the needle-exchange condition in a two-arm randomized clinical trial of needle exchange. Time to follow-up between the experimental NEP condition (n = 296; median = 261 days) and pharmacy sales condition (n = 304; median = 256 days) was not statistically different [&khgr;2 (1, N = 600) = 0.42,
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