Table 1. Demographics of Patients With ALS Included or Not Included in the Study.

Characteristic	Patients, No. (%)		P Value
	Not Included in Study (n = 75)	Included in Study (n = 127)
Age, mean (SD), y
At onset	67.2 (10.1)	62.8 (10.2)	.004
At diagnosis	68.1 (10.1)	64.2 (10.7)	.03
Female sex	30 (40.0)	58 (45.7)	.47
Site of onset
Bulbar	30 (40.0)	35 (27.6)	.15
Limb	38 (50.7)	81 (63.8)
Other	7 (9.3)	11 (8.7)
C9orf72 repeat status
Positive	6 (8.0)	21 (16.5)	.64
Negative	35 (46.7)	90 (70.9)
Not available	34 (45.3)	16 (12.6)

Abbreviation: ALS, amyotrophic lateral sclerosis.