E3N, a French cohort study on cancer risk factors. E3N Group. Etude Epidémiologique auprès de femmes de l'Education Nationale.

This paper describes the design of E3N, a prospective cohort study conducted in France on risk factors for female cancers. The cohort comprises 100,000 women, aged 40-65 years at baseline in 1990. Participants were asked to complete questionnaires every 18 months.