Validation of the Non-Motor Symptoms Scale for Parkinson’s Disease of Persian Version

Table 2

Score distribution, acceptability, precision, and reliability of the Non-Motor Symptoms Scale in PD patients.

Variables	Mean	SD	Median	Min	Max	Skewness	Floor effect%	Ceiling effect%	SEM	Item-domaincorrelation	Cronbach’s alpha	ICC
Cardiovascular	2.45	3.86	0	0	18	1.8	56.5	1.1	1.70	0.30	0.39	0.81
Sleep/fatigue	9.68	9.75	7.5	0	38	0.79	56	0.5	2.92	0.16–0.56	0.63	0.91
Mood/cognition	11.72	12.01	8	0	56	1.07	24.2	0.5	2.70	0.52–0.67	0.82	0.95
Perceptual problems/hallucinations	1.30	4.22	0	0	28	4.7	81.7	0.5	1.03	0.47–0.51	0.68	0.94
Attention/memory	5.09	6.26	4	0	29	1.44	42.5	0.5	1.25	0.48–0.74	0.8	0.96
Gastrointestinal	4.23	6.03	2	0	28	1.87	41.4	0.5	2.17	0.30–0.39	0.53	0.87
Urinary	6.54	8.28	3.5	0	33	1.35	42.5	0.5	2.48	0.48–0.58	0.71	0.91
Sexual function	4.60	6.26	0	0	24	1.17	55.4	1.6	1.53	0.41	0.56	0.94
Miscellaneous	6.36	6.85	4	0	32	0.95	37.1	0.5	2.29	0.1–0.6	0.35	0.89
NMSS total	52.01	38.54	45	0	234	1.21	2.7	0.5	10.21	—	0.84	0.93

PD: Parkinson’s disease; SD: standard deviation; SEM: standard error of measurement; ICC: intra-class correlation coefficient; NMSS: Non-Motor Symptoms Scale.