About the Authors

Carol Brayne

To whom correspondence should be addressed. E-mail: carol.brayne@medschl.cam.ac.uk

Affiliation Department of Public Health and Primary Care, Institute of Public Health, Cambridge University, Cambridge, United Kingdom

Lu Gao

Affiliation Medical Research Council Biostatistics Unit, Institute of Public Health, Cambridge, United Kingdom

Michael Dewey

Affiliation Institute of Psychiatry, King's College London, London, United Kingdom

Fiona E Matthews

Affiliation Medical Research Council Biostatistics Unit, Institute of Public Health, Cambridge, United Kingdom

Medical Research Council Cognitive Function and Ageing Study Investigators

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

CB conceived this analysis and led the study. LG and FEM designed and conducted the analysis. MD contributed at all stages. All authors discussed the results and commented on the paper. All MRC CFAS (corporate author) principle investigators and team were involved in the study and had an opportunity to comment on the paper.