Table 4. The correlations between VAS and ESS, PQSI, BDI, WOMAC, and SF-36.

	Intervention group		Control group
			VAS
Variable	r	p	r	p
ESS	0.76	<0.001	0.88	<0.001
PSQI	0.47	0.035	0.82	<0.001
BDI	0.42	0.06	0.34	0.14
WOMAC	0.83	<0.001	0.88	<0.001
Physical function	-0.03	0.89	-0.34	0.14
Role physical	0.17	0.48	0.04	0.88
Pain	0.40	0.08	-0.31	0.19
General health	-0.04	0.85	0.10	0.68
Vitality	0.29	0.21	-0.04	0.86
Social function	0.09	0.72	-0.27	0.24
Role emotion	-0.18	0.46	-0.18	0.45
Mental health	0.19	0.43	0.32	0.16
VAS: Visual analog scale, ESS: Epworth Sleep Scale, PSQI: Pittsburgh Sleep Quality Index, BDI: Beck Depression Inventory; WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index; SF-36: Short Form 36; p value <0.05 significant.