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Welsh Health Survey

The Welsh Health Survey informs local government, NHS, and nationwide health strategy. The Welsh Health Survey (WHS) collects information on the health and health-related lifestyles of people living in Wales. It is a major source of information about the health of people in Wales, the way the NHS is used, and behaviours that can affect health, such as smoking and alcohol consumption.

Data for the WHS is collected via face-to-face-interviews and self-completion questionnaires. The sampling unit for the WHS are households, however all adults within households were asked to take part. Families with children under the age of 16 are eligible, however where the household has 3 or more children, up to two children between the ages of 0 and 15 are randomly selected for inclusion in the study. Interviews are used to collect data at the household level, with questionnaires distributed to household members. Information on the household type and employment status of the household reference person are collected, and the interviewer is asked to comment on the condition of the property. Separate self-completion questionnaires are used to collect data for adults and young people (aged 13-15), whilst adults/guardians are required to complete questionnaires on behalf of children younger than 13 years old.


In 2014 the WHS sample was composed of roughly 16,970 cases, 14,170 adults and 2,800 children. Though running since 2003 consent only sought April 2013 onwards. SAIL holds 4,362 records(consent given) for 2013, 7,332 for 2014

Data Level

Individual person
Individual residence

Data Years

From 01/04/2013 to 31/ 12/2014. Though running since 2003 consent only sought April 2013 -December 2014.