What is heterogeneity and is it important?

BMJ 2007; 334 doi: (Published 08 February 2007) Cite this as: BMJ 2007;334:0-b

Some technical glitches at final proof stage led to the phrase “χ2 test” being mangled in this article by John Fletcher in the “Clinical epidemiology notes” series (BMJ 2007;334:94-96, 13 Jan, doi: 10.1136/bmj.39057.406644.68). In the caption to figure 1, the part in parentheses should start, “P for χ2 test . . .” In figure 2, the chi symbol is also missing at the bottom of the left hand columns (test for heterogeneity) in each of the two sections. These errors occurred in the printed BMJ and in the pdf on

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