BCS70 Age 5 survey (1975)

The BCS70 Age 5 survey took place during 1975 and was conducted by the Institute of Child Health at the University of Bristol.


13,135 cohort members took part in total.


In this sweep, four separate survey instruments were employed:

  • Home Interview Questionnaire
  • Maternal Self-completion Questionnaire
  • Test Booklet
  • Developmental History Schedule

More information about the coverage of each element of the survey and the downloadable questionnaires are provided here.


The data are available from the UK Data Service.  Guidance on how to use the data is provided here.


Fieldwork was funded by the Medical Research Council.

Fast facts:

  • Survey age: Age 5
  • Survey year: 1975
  • Participants: 13,135
  • UK Data Service reference code: 2699
  • PI: Neville Butler, DCH
  • Funder: Medical Research Council