Table 4.

Differences of the Health Survey (SF-36) and Sleep-Satisfaction in the SR-Sleep-Device/Placebo-Device Groups

(M ± SD)	SR-Sleep-Device Group (N = 20)				Placebo-Device Group (N=20)				p2
	Pre (1)	After 2 Weeks (2)	After 4 Weeks (3)	p1	Pre (1)	After 2 Weeks (2)	After 4 Weeks (3)	p1
The 36-Item Short-Form Health Survey (SF-36)
Physical function	87.00 ± 12.81	82.25 ± 14.00	85.00 ± 14.96	0.156	81.50 ± 17.18	80.50 ± 21.02	81.00 ± 20.94	0.982	0.398
Role limitations due to physical health	70.00 ± 40.23	65.00 ± 40.88	65.00 ± 41.68	0.773	56.25 ± 45.07	71.25 ± 43.89	76.25 ± 36.70	0.358	0.192
Role limitations due to emotional problems	45.00 ± 47.48	56.67 ± 49.68	61.67 ± 42.27	0.301	61.67 ± 39.40	71.67 ± 39.40	65.00 ± 41.15	0.598	0.314
Energy/fatigue	46.50 ± 22.07	55.00 ± 21.52	53.00 ± 23.25	0.008* (2, 3 > 1)	46.00 ± 16.59	51.00 ± 19.84	51.50 ± 21.40	0.054	0.738
Mental health	56.60 ± 18.27	61.20 ± 18.59	63.60 ± 18.67	0.005** (2, 3 > 1)	48.80 ± 17.63	55.40 ± 19.13	58.40 ± 19.18	0.023* (2, 3 > 1)	0.640
Social functioning	71.88 ± 17.62	73.75 ± 19.83	73.13 ± 19.57	0.442	71.88 ± 21.41	75.00 ± 24.33	76.25 ± 23.61	0.487	0.779
Bodily pain	77.13 ± 15.52	82.25 ± 15.75	84.38 ± 13.03	0.031* (3 > 1)	74.38 ± 16.16	80.00 ± 15.35	81.13 ± 13.94	0.098	0.968
General health	60.00 ± 22.77	61.50 ± 22.66	60.75 ± 22.84	0.867	50.25 ± 23.14	58.25 ± 20.28	59.75 ± 25.31	0.072	0.174
Sleep satisfaction	2.95 ± 1.21	-	4.75 ± 1.20	0.000***	2.20 ± 1.24	-	3.18 ± 1.85	0.004**	0.046*

Notes: *p < 0.05, **p < 0.01, ***p < 0.001. (1): pre, (2): after 2 weeks, (3): after 4 weeks.

Abbreviations: p1, Friedman test; p2, Mann–Whitney U-test (comparison of the difference between the two groups before and after).