Table 1 Demographic and clinical characteristics of the patients and controls.

Group/subgroups	n	Age (y) (mean (SD))	Sex (M/F)
Motor neuron disease
UMN	5	62.0 (7.1)	4/1
LMN	43	60.1 (10.5)	30/13
ALS	97	61.1 (11.5)	62/35
Total	145	60.8 (11.2)	97/48
Controls
NPH	45	66.4 (18.0)	25/20

ALS, amyotrophic lateral sclerosis; LMN, lower motor neuron; NPH, normal pressure hydrocephalus; UMN, upper motor neuron.