Biased risk factor assessment in prospective studies of peripheral arterial disease due to change in exposure and selective mortality of high-risk individuals.
BACKGROUND: Our aim was to assess whether risk factor assessment in prospective studies of peripheral disease (PAD) might be biased by change in exposure and selective mortality of individuals at high risk. METHODS: The cohort 'Men born in 1914' has been followed since the baseline examination 1969. PAD, (i.e. ankle-brachial pressure index