Table 4.

The type and location of epileptiform activity found in patients with young onset Alzheimer’s disease and young onset frontotemporal dementia

	Alzheimer’s disease (n = 40)	Frontotemporal dementia (n = 8)
Type of epileptiform activity
Sharp wave	22 (55.0%)	5 (62.5%)
Spike and wave	17 (42.5%)	2 (25.0%)
Sharp and slow waves	23 (57.5%)	5 (62.5%)
Location of epileptiform activity
Left frontal	22 (55.0%)	2 (25.0%)
Right frontal	16 (40.0%)	3 (37.5%)
Left temporal	24 (60.0%)	3 (37.5%)
Right temporal	21 (52.5%)	4 (50.0%)
Left posterior	2 (5.0%)	1 (12.5%)
Right posterior	6 (15.0%)	1 (12.5%)
Central	11 (27.5%)	1 (12.5%)
Generalised	5 (12.5%)	0 (0.0%)