Table 4.

Demographic and clinical information for patients with amyotrophic lateral sclerosis with co-morbid frontotemporal dementia

	Patients without the C9orf72 repeat expansion (n=20)	Patients with the C9orf72 repeat expansion (n=10)	p value
Age at onset (years)
Mean	64·8 (9·5)	57·4 (8·1)	0·045
Median	65·6 (56·7–72·5)	58·2 (55·9–62·8)	0·100
Age at diagnosis (years)
Mean	65·9 (9·7)	58·7 (7·9)	0·053
Median	66·9 (57·5–74·2)	59·8 (56·9–63·9)	0·100
Site of onset
Bulbar	10 (50%)	1 (10%)	0·049
Spinal	10 (50%)	9 (90%)	..
Sex
Male	13 (65%)	7 (70%)	1·000
Female	7 (35%)	3 (30%)	..
Type of frontotemporal dementia
Behavioural	15 (75%)	10 (100%)	0·143
Language variant	5 (25%)	0 (0%)	..

Data are mean (SD), median (IQR), or number (%).