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xiao ying he fan ying
Pages: 1183
Year: Issue:  10
Journal: Occupation and Health

Abstract: <正>效应(effect)是指个体或群体接触外来化学物后所发生的生物学改变。这种改变往往能用计量资料以表达其强度,属量效应(graded effect)。此时对量效应在群体中的强度,多数用个体测定值的均值来表达。某些性质的效应难以量化其强度,如死亡、头痛等,此时只能从效应的有、无或表现异常与否予以计数,即为质效应(grantal effect)。质效应对群体影响大小是
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