Table 3

Frequency of behavioural changes specified in diagnostic criteria

	Percentage showing altered behaviour		χ²	P value
	bvFTD n=22	FTD-ALS n=17	χ²	P value
Disinhibition
Inappropriate behaviour	59	29	3.4	0.07
Loss of manners/decorum	91	59	Fisher’s	0.03^*
Impulsivity	86	41	8.8	0.003**
Apathy and inertia
Apathy	96	100	Fisher’s	1.00
Inertia	41	41	0.0	1.0
Loss of sympathy or empathy
Loss of sympathy	91	53	Fisher’s	0.01^*
Reduced social interest	77	65	Fisher’s	0.48
Perseverative, stereotyped, ritualistic behaviour
Simple repetitive	91	47	Fisher’s	0.004**
Complex repetitive	68	29	5.8	0.02^*
Verbal stereotypies	14	24	Fisher’s	0.68
Hyperorality and dietary change
Food fads/sweet food preference	86	65	Fisher’s	0.14
Binge eating	55	29	2.5	0.12
Oral exploration of inedible objects	0	0	–	–

*p<0.05; **p<0.01.
ALS, amyotrophic lateral sclerosis; bvFTD, behavioural variant FTD; FTD, frontotemporal dementia.