This website collates sample sizes for a range of population subgroups in the four CLS cohort studies, including special category data and other key characteristics, such as socio-economic class. The sample sizes can be viewed using the two tools below:

Variable and Category Selection: Tabulates the number of cases in each study by survey sweep for population subgroups.

Age Range Selection: Calculates sample sizes within each domain, combining data from multiple cohorts and from sweep within a specified age range.