BMJ 1997; 315 doi: (Published 01 November 1997) Cite this as: BMJ 1997;315:1129

Risk of testicular cancer in cohort of boys with cryptorchidism

An author's error occurred in this paper by A J Swerdlow et al (24 May, pp 1507-11). The number of person years for cancer incidence during follow up of the cohort should have been 20 160 (not 26 389). The correct person years were used in calculation of risk in the study; there are no errors in the risks presented and no consequences for any of the results.

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