Core-restricted datasets	Features (with approximate volumes)
Active Adult Survey	Large scale survey of the adult population in Wales covering sport related activities, provided by Sport Wales. Data on 13,000 individuals between January 2012 and January 2013.
Bowel Screening Wales	Administrative and clinical information for bowel screening, collected by Public Health Wales. 140,000 screening test records per year, from 2008 onwards.
Breast Test Wales	Administrative and clinical information for breast screening, collected by Public Health Wales. 110,000 screening test records per year, from 1989 onwards.
Cervical Screening Wales	Administrative and clinical information for cervical screening, collected by Public Health Wales. 225,000 screening test records per year, from 1990 onwards.
Congenital Anomaly Register and Information Service (CARIS)	Information about foetuses or babies who has or is suspected of having a congenital anomaly, collected by CARIS. 1,500 babies per year, from 1998 to 2011.
Educational Attainment	Annual return submitted by all sectors including nursery, primary, middle, secondary and special schools, provided by Welsh Government. 470,000 records per year, from 2003 to 2015.
National Survey for Wales	The Welsh Government’s major survey of the general population in Wales covering a wide range of topics affecting people and their local area. 12,000 people per year, from 2012 to 2015.
Welsh Cancer Intelligence and Surveillance Unit (WCISU)	National Cancer Registry for Wales to record, store and report on all incidences of cancer, collected by WCISU. 686,000 records, from 1972 to present.
Welsh Health Survey	Information on the health and health-related lifestyles of people living in Wales, collected by the National Centre for Social Research. 4,400 records from April 2013 to December 2014.