摘要：This paper discusses the phenomenon of spurious or secondary association between factors in heterogeneous study populations. The mathematical basis of this phenomenon is set out and some numerical examples are given. The relevance of the findings to the interpretation of epidemiological studies is examined. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (479K), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References . 83 84 85 86
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