Why did the study rely on MoD records? Surely this could have biased the results?
There was no alternative to using MoD records for establishing a substantially complete cohort and obtaining estimates of radiation dose. All other sources would have been far less complete and most would have been biased in terms of the health experience of those included. Nevertheless, attempts were made to collect as much data as possible from other sources, both to assess the completeness of coverage of the study population and to examine the possibility of bias.
