Table 1. Demographic Features Including Age, Sex and ASA.

Variable	Group C	Group M	Group A	P Value
N	58	59	58
Age, y	68.3 ± 1.6	63.59 ± 1.38	67.9 ± 1.3	0.035
Female/Male	29/29	33/26	31/27	0.222
ASA (I/II/III)	3/37/18	10/35/14	4/36/18	0.812

Abbreviations: A, acetaminophen; C, control; M, melatonin.