The number of variables for each cohort varies from a few hundred up to a couple of thousand. Some variables are present in all cohorts, others are only found in some. Some variables enable longitudinal studies, others only cross-sectional studies. ETF has developed an interactive list of variables to make it easier to search among the variables and see relationships between variables in different cohorts.
The variables are accessed through the links below. Questions about documentation are answered via e-mail to data controllers within ETF.