Incidence of dementia in a representative British sample.
In a four-year follow-up study of 1042 elderly people (aged 65 years or older), randomly sampled from the community, levels of dementia were assessed using a two-phase case-finding procedure (screening followed by clinical interview) among survivors. Clinical information on those not reinterviewed was provided by death certificates, hospital case notes, or postal questionnaires. The weighted four-year cumulative incidence of dementia was 3.7% (95% confidence intervals: 2.4%-5.0%), with age-specific rates of 0.9%, 2.8%, 5.2%, 9.0%, and 8.7% for the age groups 65-69, 70-74, 75-79, 80-84, and 85-89 years respectively. While consistent with data from other British regions, it remains likely that these rates underestimate true incidence.
Morgan
K
K
Department of Health Care for the Elderly, University of Nottingham Medical School.
Lilley
J M
JM
Arie
T
T
Byrne
E J
EJ
Jones
R
R
Waite
J
J
D000368:Aged; D003072:Cognition Disorders / Q000150:complications / Q000175:diagnosis; D003704:Dementia / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D005500:Follow-Up Studies; D006753:Hospital Records; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D009026:Mortality; D015995:Prevalence; D011569:Psychiatric Status Rating Scales; D011581:Psychological Tests; D012737:Sex Factors; D011795:Surveys and Questionnaires; D015996:Survival Rate; D006113:United Kingdom / Q000453:epidemiology