The ONS Longitudinal Study (LS) is stored at the Office for National Statistics and contains census and life events data, linked between five successive censuses, beginning in 1971. The sample is of people living in England and Wales who were born on one of four selected dates of birth, i.e. 4 out of 365 days of the year, so it makes up about 1% of the total population. The sample was updated at the 1981, 1991, 2001 and 2011 Censuses and in registrations of life events such as deaths, births to sample mothers, emigrations and cancer registrations. Fresh LS members enter the study through birth and immigration and existing members leave through emigration or death, however their data is retained. The LS now includes records for over 1,100,000 individuals.
Census information is also included for all people living in the same household as the LS member. However, the LS does not follow up household members in the same way from census to census.
- Find out more about longitudinal studies
- Find out about using the ONS Longitudinal Study
- The census forms used to collect LS data
- Guides to using ONS LS data
Find out about the origin of the LS.
Discover which census and events data the LS contains.
Discover the types of analysis you can do.