Approximately five years after completion of the first questionnaire, a follow-up questionnaire was distributed. About 70% were returned completed. This questionnaire provides us with information on changes in diet, lifestyle and health.
A second follow-up questionnaire was sent in 2007, approximately 10 years after the participants joined the study.
Additionally, each participant is followed for cancer incidence and cause specific mortality through the NHS Central Registry.
Posted Mar 18, 03:55 PM · link to this article