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Several errors occurred in this article by McManus (24 October, pp 1111-1117). It was not made clear that the whole of the first paragraph was a quotation from the 1986 paper by Horton (cited as
reference 1). In table 2 the results for the University of Birmingham
were wrong: the symbol
should have appeared in three additional
rows
"has made an insurance choice," "is female," and "is
from an ethnic minority." In figure 3 the odds ratio for Birmingham
for 1997 should have been 1.526 (95% CI 1.1616 to 2.007), placing it
between Glasgow and Leicester; the values for 1996 are correct but in
the wrong position (further details of the corrected analysis are
available at www.cvcp.ac.uk/chms/).