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. 2012 Mar;21(1):27-9.
doi: 10.1017/s2045796011000643.

Heterogeneity: the issue of apples, oranges and fruit pie

M Purgato  1 , C E Adams
Affiliations

Heterogeneity: the issue of apples, oranges and fruit pie

M Purgato et al. Epidemiol Psychiatr Sci. 2012 Mar.

Abstract

Heterogeneity refers to any kind of variation among studies contributing to the same outcome in a systematic review. There are three broad types of heterogeneity: clinical heterogeneity, methodological heterogeneity and statistical heterogeneity. In this paper, we describe these three types of heterogeneity and the main statistical approaches to measure heterogeneity.

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