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pubmed-article:2720058pubmed:abstractTextIn epidemiologic studies of infectious diseases, the times of infection may be known only up to an interval. A two-stage parametric regression model is proposed for the analysis of cohort studies during an epidemic in which the exact times of infection cannot be ascertained. The methods permit joint estimation of the effects of covariates both on the risk of infection and the risk of progression to clinical disease once infected. The methodology is applied to a cohort of hemophiliacs who were at risk of infection with the AIDS virus. It was found that hemophiliacs with severe Type A hemophilia were at highest risk of infection, and the risk of infection increased sharply in the early 1980s. Hemophiliacs who were over the age of 20 at infection were at higher risk of progression to AIDS than hemophiliacs who were under age 20. The estimate of the cumulative probability of developing AIDS within t years of infection (the incubation period distribution) for hemophiliacs over age 20 was 1 - exp(-.0021t2.516). Since follow-up in this cohort was restricted to about 10 years from infection, estimates of the incubation period distribution beyond 10 years depend on model extrapolation and should be interpreted cautiously.lld:pubmed
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pubmed-article:2720058pubmed:articleTitleCensoring in an epidemic with an application to hemophilia-associated AIDS.lld:pubmed
pubmed-article:2720058pubmed:affiliationDepartment of Biostatistics, Johns Hopkins University, School of Hygiene and Public Health, Balitmore, Maryland 21205.lld:pubmed
pubmed-article:2720058pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2720058pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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