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A clustered 10% sample of the main NCDS cohort, i.e. all those living in England and Wales born in one particular week in 1958, who had participated in an earlier NCDS follow-up and were not known to have died, emigrated or refused.;National
Sampling
One-stage cluster sample.;A simple random sample of the NCDS cohort. Twenty-five sampling points were used, based on interval sampling of all postcode areas in England and Wales, with a random starting point.
Study Type
Longitudinal/panel/cohort conducted between the fifth and sixth full NCDS cohort surveys.