Table 1.

Demographic and clinical characteristics of PD patients. Values are shown as mean ± standard deviation

	PD patients
	n = 62
Age (yr)	71.40 ± 7.84
Education (yr)	11.26 ± 3.78
Gender (M:F)	36:26
MMSE score	28.46 ± 1.98
MCI (Y:N)	29:33
MDS-UPDRS-III score	20.76 ± 8.31
GDS-15 score	3.61 ± 3.10
PDSS-2 scores
Total score	13.91 ± 9.47
Abnormal total score (≥ 18)	n = 16 (25.8%)
Fragmented sleep	4.5 ± 2.45
Insomnia symptoms	1.5 ± 1.79
Motor symptoms	4.24 ± 4.62
Dream distressing	1.06 ± 1.78
Sleep quality	2.61 ± 2.11
Polysomnographic data
SE (%)	79.42 ± 10.4
Any-REM (%)	22.22 ± 44.09
PSG-confirmed RBD	n = 34 (54.83%)
WASO (min)	96.88 ± 72.27
SL (min)	40.28 ± 88.77
Awakenings (n/TST)	0.06 ± 0.04
Stage Shift (n/TST)	0.46 ± 0.19
AHI	12.33 ± 26.33
Mild: 5 < AHI > 15	n = 10 (16.12%)
Moderate: 15 < AHI > 30	n = 8 (12.9%)
Severe: AHI > 30	n = 11 (17.74%)
PLMI	5.38 ± 11.8
PLMI > 5	n = 5 (8.06%)
PLMI > 15	n = 24 (38.7%)

Legend: AHI, Apnoea-Hypopnea Index; F, female; GDS, 15-item Geriatric Depression Scale; M, male; MDS-UPDRS-III, Movement Disorders Society-sponsored revision of the Unified Parkinson’s Disease Rating Scale, motor section; MMSE, Mini Mental State Examination; PD, Parkinson’s Disease; PDSS-2, Parkinson’s Disease Sleep Scale; PLMI, Periodic Leg Movement Index; RBD, REM sleep behaviour disorder; REM, Rapid eyes movements; SE, Sleep Efficiency; SL, Sleep Latency; TST, Total sleep time; WASO, Wake After Sleep Onset