Table 1.

Baseline characteristics of amyotrophic lateral sclerosis (ALS) patients in the study.

ALS patients	N = 18
Sex (male : female)	14 : 4
Age (years)	56.06 (±7.53)a
Age at onset	52.39 (±9.29)a
K-ALSFRS-R score (maximum: 48)	33.24 (±5.19)a
Respiration subscores in K-ALSFRS-R (total: 12)	9.71 (±3.24)a
Site of onset
Bulbar	3
Upper limb	5
Lower limb	10

a: mean ± standard deviation.

K-ALSFRS-R: Korean-ALS Functional Rating Scale-Revised.