Any code indicating that a person has dementia, including Alzheimer's disease.
Code set from https://www.opencodelists.org/codelist/opensafely/dementia-complete/48c76cf8/ supplemented with codes from the NHS PCD refsets.
By examining the prevalence of codes (number of patients with the code in their record) broken down by clinical system, we can attempt to validate the clinical code sets and the reporting of the conditions. Here is a log for this code set. The prevalence range 0.67% - 0.81% suggests that this code set is likely well defined.
Update 2024-03-15: Prevalence now 0.83% - 0.99%.
| Date | Practice system | Population | Patients from ID | Patient from code |
|---|---|---|---|---|
| 2022-12-20 | EMIS | 2438146 | 19770 (0.811%) | 21772 (0.893%) |
| 2022-12-20 | TPP | 198637 | 1427 (0.718%) | 7445 (3.75%) |
| 2022-12-20 | Vision | 327196 | 2244 (0.686%) | 2265 (0.692%) |
| 2024-02-26 | EMIS | 2522441 | 27712 (1.1%) | 27745 (1.1%) |
| 2024-02-26 | TPP | 201679 | 2216 (1.1%) | 1872 (0.928%) |
| 2024-02-26 | Vision | 334812 | 3169 (0.947%) | 3170 (0.947%) |
| 2024-03-15 | EMIS | 2526522 | 24910 (0.986%) | 24994 (0.989%) |
| 2024-03-15 | TPP | 201758 | 1928 (0.956%) | 1948 (0.966%) |
| 2024-03-15 | Vision | 335186 | 2772 (0.827%) | 2780 (0.829%) |
- Find_missing_codes last run 2024-03-15