Table 2.

Means and Standard Deviations of the Sample Psychometric Tests and Serum Melatonin Levels

	BDI	ESS	MEQ	ISI	Preoperative MEL	Daytime Postoperative MEL	Nighttime Postoperative MEL
Mean	13.5	7.5	18.25	16.7	12.59	60	79.1
SD	11.2	4.4	4.5	7.3	10.2	49.2	56.4
Min	8	0	5	1	1.46	106	8.11
Max	49	16	24	30	35	169	189
Range	41	16	19	29	33	158	180