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Table 2 Correlations between the Epworth sleepiness scale (ESS) scores and clinical and sleep characteristics of multiple system atrophy (MSA) patients

From: Daytime sleepiness in Japanese patients with multiple system atrophy: prevalence and determinants

Variables

r value

P value

Disease duration (months)

−0.063

0.766

UMSARS

0.210

0.337

MMSE

−0.047

0.825

FAB

−0.098

0.657

Total sleep time (min)

0.262

0.215

Sleep efficiency (%)

0.297

0.149

Stage N1 (%)

0.138

0.512

Stage N2 (%)

0.179

0.391

Stage N3 (%)

−0.267

0.197

Stage REM (%)

−0.311

0.131

Arousal index (/h)

−0.070

0.738

AI (/h)

0.069

0.744

AHI (/h)

0.098

0.640

Mean SpO2 (%)

0.080

0.705

PLM index (/h)

−0.218

0.296

PLM arousal index (/h)

0.066

0.755

LED (mg)

0.662

0.027

  1. UMSARS, unified multiple system atrophy rating scale; MMSE, mini-mental state examination; FAB, frontal assessment battery; REM, rapid eye movement; AI, apnea index; AHI, apnea-hypopnea index; SpO2, oxygen saturation; PLM, periodic leg movement; LED, L-dopa-equivalent dose.