Table 2.

Descriptive Statistics

Subscale	Mean	S.D	Min	Max
PSQI
1. Subjective sleep quality	1.78	0.87	0	3.00
2. Sleep latency	2.39	0.71	1	3.00
3. Sleep duration	1.99	1.01	0	3.00
4. Habitual sleep efficiency	1.98	1.23	0	3.00
5. Sleep disturbances	1.39	0.51	0	2.00
6. Use of sleeping medication	0.82	1.21	0	3.00
7. Daytime dysfunction	1.64	0.82	0	3.00
Global Sleep Quality	12.00	4.55	2	19.00
SF-12
MCS	40.09	12.04	15	60.81
PCS	31.13	9.22	16	60.25
VAS Pain
	6.25	1.93	1	10.00