Table 7. Mean and standard deviation of sedation scores between control and intervention groups at each time point .

Sedation score at:	Group		P-value
	Control	Melatonin
	M ± SD	M ± SD
base	1.77 ± 0.728	2.50 ± 0.731	0.016
1 hour	1.90 ± 0.803	2.30 ± 0.651	0.031
2 hour	1.80 ± 0.80	2.07 ± 0.45	0.001
6 hour	1.53 ± 0.50	2.13 ± 0.50	0.014
12 hour	2.47 ± 0.50	2.30 ± 0.46	0.110
24 hour	2.03 ± 0.66	1.97 ± 0.41	0.980

Interpretation: a Two-sided tests with significance level of 0.05 (Independent Samples T-test)