Table 1. Clinical characteristics of all study participants.

	ALS (n = 44)	All Disease Controls (n = 25)	Mimic Disease Controls (n = 9)	Healthy controls (n = 35)
Sex (male/female)	31/13	13/12	7/2	13/22
Age at first draw ± SD (years)	54.8±13.5	47.9±15.4	57.2±11.8	46.8±15.6
Relevant subgroups	35 limb onset, 5 bulbar onset, 4 mixed/other onset	9 ALS mimics, 6 MS, 10 other	2 PLS, 2 CIDP, 2 PMA, 1 SA, 1 small fiber neuropathy, 1 idiopathic sensorimotor polyneuropathy	NA

MS  =  multiple sclerosis; PLS  =  primary lateral sclerosis; CIDP  =  chronic inflammatory demyelinating polyneuropathy; PMA  =  progressive muscular atrophy; SA  =  spinocerebellar ataxia; NA  =  not applicable.