Table 1.

Baseline characteristics of the participants.

		Group		p value#
		Melatonin (n = 19)	Placebo (n = 19)
Gender∗	Female	16 (84%)	14 (74%)	0.364
	Male	3 (16%)	5 (26%)
Smoking	Smoker	1 (5%)	1 (5%)	0.757
	Nonsmoker	18 (95%)	18 (95%)
Education level	Diploma and bellow	8 (42%)	12 (63%)	0.194
	Associate and higher	11 (58%)	7 (37%)
Marital status	Married	14 (74%)	13 (68%)	0.721
	Single	5 (26%)	6 (32%)

^∗Data are shown as n (%). ^# Chi-square statistical analysis was used. p value <0.05 considered as significant.