Owing to an error in our processes, a previous (and uncorrected) proof of the abridged version of this paper by Hallan and colleagues was published in the printed journal and posted on bmj.com (BMJ 2006;333:1047-50, 18 Nov, doi: 10.1136/bmj.39001.657755.BE). The authors had told us of an error in their analysis that meant the figures given for the UK chronic kidney disease guidelines in the abstract, results, and table were incorrect. Restriction of screening according to the UK guidelines detected 60.9% (59.1% to 62.8%) of cases [not 51.6% (49.6% to 53.4%) as stated]. The corrections were done for the full length version of the paper, and a faulty link to that version on bmj.com has been fixed.