A characterisation of patient drop outs in a cohort of HIV positive homosexual/bisexual men and intravenous drug users

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Abstract
We defined drop out as one who missed one or more follow ups and did not return before study termination. Deaths were not considered drop outs. We studied three groups of drop outs: enrollees who never returned (NFU); enrollees who returned for one or more follow ups and then left without explanation (FU-NE); and enrollees who returned for one or more follow ups and left with an explanation (NFU-E). Non-drop outs were denoted NDO. Eleven hundred and fifteen people were enrolled through six major medical centres in six US metropolitan areas. The Institutional Review Boards at each of the centres reviewed and approved the study protocol. The cohort consisted of homosexual/bisexual (H/B) men and intravenous drug users (IDUs) who were classified into two disease severity groups. This cohort is part of a slightly larger cohort that has been described elsewhere.1

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