Demographic and clinical characteristics of patients and controls.

<p>ALS, amyotrophic lateral sclerosis; ALSFRS-R, revised ALS functional rating scale; ALSSS, ALS severity scale; HC, healthy controls; PMA, progressive muscular atrophy; the disease progression rate was calculated according to the formula of (48-ALSFRS-R score)/disease duration (month).</p><p>Data were means±SD.</p><p>Demographic and clinical characteristics of patients and controls.