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The wrong table 3 was published in the print version of this
paper by Rosalind Green and colleagues (30 March, pp 763-6). The
correct table shows the univariate analysis of potential risk factors
for admission to hospital in two groups of patients with asthma. It can
be accessed in the full version of the paper as table 5 on
bmj.com/cgi/content/full/324/7340/763. We apologise for this error.