منابع مشابه
U.S. sperm trend conclusions.
The letter written by Heinze (1) has serious shortcomings. Heinze wrote that There is not a single study of healthy men from any fertility center or sperm bank that has reported a decline in sperm counts in the United States. This is not true. A number of such studies exist. Leto and Frensilli (2) documented a decline in sperm counts in potential sperm donors from all over the United States in ...
متن کاملInterregional differences undermine sperm trend conclusions.
Environmental Genome Project. Issues such as these should be carefully considered and addressed during the early stage of the project. As noted at the beginning of the Environmental Genome Project symposium , the project is evolving and is a work in progress. As with any evolving program, it will continue to be molded by new ideas, information, and technologies. The goal of the initial phase of...
متن کاملRegional differences invalidate U.S. sperm trend conclusions.
-Patients with melanoma who had one or more close relatives with melanoma were studied for their natural-killer-cell (NK) activity against cultured melanoma cells and Chang cells. A high proportion of the patients and their relatives were found to have low NK activity against these target cells. In most of the patients this could not be attributed to general depression of their immune function,...
متن کاملHave sperm densities declined? A reanalysis of global trend data.
In 1992 a worldwide decline in sperm density was reported; this was quickly followed by numerous critiques and editorials. Because of the public health importance of this finding, a detailed reanalysis of data from 61 studies was warranted to resolve these issues. Multiple linear regression models (controlling for abstinence time, age, percent proven fertility, specimen collection method, study...
متن کاملResponse: Sperm Density Declines
Last year Swan et al. (1) published a reanalysis of data from 61 studies originally compiled and analyzed by Carlsen et al. (2). Just prior to the appearance of the Swan et al. artide, we published a reanalysis in another journal (3). Regional differences were considered in both reanalyses, but we examined only the effect ofyear in the final models (fertility status was also considered in the i...
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ژورنال
عنوان ژورنال: Environmental Health Perspectives
سال: 1999
ISSN: 0091-6765,1552-9924
DOI: 10.1289/ehp.107-1566707