Table 3.

Diagnosis definitions used in the study, presented with the number of patients

Diagnosis	Definition	Patients
Probable AD	Patients with one or more codes on the list ‘probable AD’. Patients may also have codes on the lists ‘possible AD’, ‘donepezil’, ‘rivastigmine’, ‘galantamine’ and ‘memantine’.	10,651
Possible AD	Patients with one or more codes on the list ‘possible AD’. Patients may also have codes on the lists ‘donepezil’, ‘rivastigmine’, ‘galantamine’ and ‘memantine’.	12,167
Non-AD and mixed dementias	Patients with one or more codes on any of the following lists: ‘probable AD’, ‘possible AD’, ‘other dementia’, ‘vascular dementia’, ‘non-specific dementia’, ‘donepezil’, ‘rivastigmine’, ‘galantamine’ and ‘memantine’, who do not meet the above criteria.	17,384

AD Alzheimer’s disease

The data presented are restricted to patients who received a diagnosis prior to 1st January 2016 and are from an English practice with a last data collection date in 2016 to reflect the main analysis. The total number of patients with ‘any dementia’ is 40,202