The Health Survey for England (HSE) is an important annual survey looking at changes in the health and lifestyles of people all over the country.
Around 8,000 adults and 2,000 children take part in the survey each year. Information is collected through an interview and, if participants agree, a visit from a specially trained nurse.
The surveys, which have been carried out since 1991, provide regular information that cannot be obtained from other sources.
Find out more on the NatCen website.