Is the MDS-UPDRS a Good Screening Tool for Detecting Sleep Problems and Daytime Sleepiness in Parkinson’s Disease?

Table 2

Prevalence, frequency, and correlation values for sleep-related problems.

	Prevalence	Frequency of score 0	Frequency of score 1	Frequency of score 2	Frequency of score 3	Frequency of score 4	Median	Percentile 25	Percentile 75	Correlation with MDS-UPDRS item 1.7
MDS-UPDRS item 1.7	68.5%	145	100	82	108	25	1	0	3	1.000
PDSS item number 01	68.0%	147	125	99	58	31	1	0	2	.573^**
PDSS item number 02	50.9%	226	79	91	44	20	1	0	2	.546^**
PDSS item number 03	67.4%	150	87	81	73	69	1	0	3	.682^**
PDSS item number 04	52.2%	220	74	86	53	27	1	0	2	.369^**
PDSS item number 05	51.1%	225	80	80	48	27	1	0	2	.390^**
PDSS item number 06	43.0%	262	91	79	18	10	0	0	1	.156^**
PDSS item number 07	15.0%	391	40	19	5	5	0	0	0	.169^**
PDSS item number 08	91.1%	41	97	102	109	111	2	1	3	.275^**
PDSS item number 09	48.7%	236	61	64	62	37	0	0	2	.238^**
PDSS item number 10	51.3%	224	74	86	50	26	1	0	2	.323^**
PDSS item number 11	57.2%	197	101	94	45	23	1	0	2	.283^**
PDSS item number 12	42.8%	263	68	62	45	22	0	0	2	.268^**
PDSS item number 13	45.7%	250	64	60	54	32	0	0	2	.127^**
PDSS item number 14	70.9%	134	135	102	56	33	1	0	2	.302^**
PDSS item number 15	31.7%	314	65	56	15	10	0	0	1	.189^**
PDSS motor domain	82.7%						4	2	7	.398^**
PDSS PD symptoms domain	82.3%						3	1	6	.358^**
PDSS disturbed sleep domain	97.0%						8	4	11	.707^**
PDSS total score	98.3%						15	9	23	.598^**

< 0.01.