Figure 4From: The impact of attrition on the representativeness of cohort studies of older people Changes to prevalence of the hypothetical risk factor assuming an association between the risk factor and the risk of death, in the population and the cohort; an association between the risk factor and non-death attrition in the cohort. Figure 4A assumes no bias and Figure 4B assumes lower prevalence of the risk factor at the beginning of the study.Back to article page