Table.

Incidence and hazard ratio for dementia subtypes between matched cohorts of patients diagnosed with COVID-19 versus influenza

	Incidence within 6 months after COVID-19	Incidence within 6 months after influenza	Hazard ratio	p value
Alzheimer's disease (G30)	0·071% (0·050–0·10)	0·036% (0·025–0·054)	2·19 (1·29–3·70)	0·0029
Vascular dementia (F01)	0·063% (0·042–0·094)	0·041% (0·029–0·060)	1·59 (0·94–2·70)	0·082
Dementia in other diseases classified elsewhere (F02)	0·11% (0·081–0·15)	0·055% (0·040–0·076)	2·11 (1·37–3·23)	0·0005
Unspecified dementia (F03)	0·25% (0·20–0·31)	0·12% (0·094–0·15)	2·04 (1·52–2·75)	<0·0001

Data in parentheses are 95% CIs. Dementia subtypes are presented with their ICD-10 codes. The sum of incidences exceeds the total incidence of dementia because the same patient might be diagnosed with one subtype (eg, unspecified dementia) and then another (eg, Alzheimer's disease) within the follow-up period. No data can be shown for frontotemporal dementia and Lewy body dementia because they occurred in fewer than ten patients in each cohort (which is the minimum number to be returned by TriNetX to safeguard patients' anonymity).