One of the first decisions that needs to be taken when planning a birth cohort concerns the size of the study. This in turn will depend on the research questions to be answered and thence whether environmental exposures and outcomes are measured on a continuum or as dichotomous variables. Here we describe ways in which different birth cohorts have addressed this issue and explore the advantages of smaller detailed studies over larger less-detailed studies.
|Translated title of the contribution||How many subjects are needed in a longitudinal birth cohort study?|
|Pages (from-to)||31 - 38|
|Number of pages||8|
|Journal||Paediatric and Perinatal Epidemiology|
|Publication status||Published - Jul 2009|