Outcomes of screening to prevent cancer: analysis of cumulative incidence of cervical abnormality and modelling of cases and deaths prevented

Three errors appeared in this paper by A E Raffle and colleagues (26 April, 901-4). After proof stage, we inadvertently changed the word “thousand” to the number “100” in the title of table 1. The title should read: “Numbers and rates of women with abnormal cytology and abnormal histology per 1000 women tested since 1976 for those screened in 1991-6.” We also incorrectly transferred to the abridged version a change made by the authors at proof stage: in the section “Combined consequences, benefits, and harms” the number of tests involved in screening 1000 women for 35 years should have been reported as 7700 [not 7777]. An error in the section “Progression rates” persisted through all stages to publication: “56 of the estimated 80 cancers per thousand” should have read “56 of the estimated 80 cancers per 10 000.”