Minimal Clinically Important Difference on Parkinson’s Disease Sleep Scale 2nd Version

Table 2

Mean changes of PDSS-2 scores with respect to Patient-Rated Global Impression of Improvement scores.

	PDSS-2 total score					PDSS-2 motor symptoms domain					PDSS-2 PD symptoms domain					PDSS-2 disturbed sleep domain
	Mean	SD	Median	25th percentile	75th percentile	Mean	SD	Median	25th percentile	75th percentile	Mean	SD	Median	25th percentile	75th percentile	Mean	SD	Median	25th percentile	75th percentile
PGI-I (sleep problems)
A little better	−3.44	6.40	−3.00	−5.00	2.00	−.92	2.98	0.00	−2.00	1.00	−.92	2.48	0.00	−1.00	0.00	−1.60	2.87	−2.00	−3.00	1.00
The same	−0.54	3.24	−1.00	−3.00	3.00	−.15	4.02	0.00	−3.00	2.00	−.15	3.38	0.00	−2.00	1.00	−.21	3.35	0.00	−3.00	1.00
A little worse	2.07	7.72	2.00	0.00	7.00	0.53	4.01	1.00	−1.00	3.00	0.47	3.62	0.00	−1.00	3.00	1.07	3.12	1.00	1.00	4.00

SD: standard deviation; PDSS-2: Parkinson’s Disease Sleep Scale 2nd version; PGI-I: Patient-Rated Global Impression of Improvement.