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Objectives To estimate survival after a diagnosis of dementia in primary care, compared with people without dementia, and to determine incidence of dementia.

Design Cohort study using data from The Health Improvement Network (THIN), a primary care database.

Setting 353 general practices in the United Kingdom providing data to THIN.

Participants All adults aged 60 years or over with a first ever code for dementia from 1990 to 2007 (n=22 529); random sample of five participants without dementia for every participant with dementia matched on practice and time period (n=112 645).

Main outcome measures Median survival by age and sex; mortality rates; incidence of dementia by age, sex, and deprivation.

Results The median survival of people with dementia diagnosed at age 60-69 was 6.7 (interquartile range 3.1-10.8) years, falling to 1.9 (0.7-3.6) years for those diagnosed at age 90 or over. Adjusted mortality …