At the end of her page in the issue of 5 April (p 772), Minerva reported a follow up study of men taking part in atmospheric tests of nuclear weapons in Australia and the Pacific in the 1950s and 1960s (Occupational and Environmental Medicine 2003;60: 165-72). Unfortunately, she overstated the total number of UK test participants by a factor of 10: just over 21 000 men took part, not “some 200 000.” The authors estimate that the cohort they studied represented about 85% of all UK test participants.