循证医学系统评价的一些翻译

Epidemiologicalpapersthataddressanassociationbetweenbenzeneexposureandnon-Hodgkinlymphoma(NHL)wereidentifiedandseparatedbystudydesign.Eighteenstudiescontained21studygroups—11population-basedcase–controlstudygroups,3nestedoccupation-basedcase–controlstudygroupsand7occupationalbenzenecohortstudygroups.Petroleumindustrystudieswerenotincluded.Onlytwoofthese21studygroupsshowedstatisticallysignificantassociations.However,thesewereamongworkerswithmultipleexposuresacrossindustries.Elevenofthe21studygroupspresentedratioslessthanone,twoequaledone,andeightweregreaterthanone.Overall,aboutasmanycaseswereobserved(404)asexpected(390.0)foranobservedtoexpectedratioof1.04(0.94–1.14).Afterremovalofthestudieswithmultiplechemicalexposuresproblems,theobservedwas359caseswith373.2casesexpected,yieldinganoddsratioof0.96(0.86–1.06).FurtherassessmentofanassociationwithNHLshoulddocumentthebenzeneexposureandseparateoutthecontributionofnon-benzeneexposures.©2005ElsevierIrelandLtd.Allrightsreserved.

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