. Author manuscript; available in PMC: 2013 Mar 1.

Published in final edited form as: Parkinsonism Relat Disord. 2011 Nov 30;18(3):279–284. doi: 10.1016/j.parkreldis.2011.11.004

Table 3.

ESS and PSQI scores of normal controls, ET cases, and PD cases.

	Normal controls	ET cases	PD cases	p-Value, comparing all 3 groups	p-Value, ET vs. controls
ESS	5.7 ± 3.7 (5.0)	6.8 ± 4.6 (6.0)	7.8 ± 4.9 (7.0)^d	0.03^a	0.08^b
ESS score >10	11 (9.2%)	27 (22.5%)	10 (25.0%)	0.008^c	0.005^c
ESS score ≤10	109 (90.8%)	93 (77.5%)	30 (75.0%)
PSQI	7.8 ± 2.8 (7.5)	8.0 ± 3.3 (8.0)	9.9 ± 3.9 (10.0)^d	0.01^a	0.8^b

Kruskal–Wallis test, when comparing all three groups.

Mann–Whitney test, when comparing ET cases and normal controls.

Chi-square test.

For ESS, the PD case vs. control difference was significant (p = 0.01). For PSQI, the PD case vs. control difference was significant (p < 0.01).