Table II.

Identified metabolites in the serum of the different groups.

RT (min)	Mass (Da)	Metabolite	ANOVA analysis		VIP	Model and control		VIP	MT and model
			F-value	P-value		Fold change	P-value of Tukey's test		Fold change	P-value of Tukey's test
13.11	174	5-Aminopentanoate	24.711	<0.001	1.52	0.78	0.002	1.71	1.50	<0.001
7.41	174	5-Methoxytryptamine	29.066	<0.001	1.51	0.79	<0.001	1.21	1.10	0.029
28.57	202	Tryptophan	24.329	<0.001	1.44	1.75	<0.001	1.62	0.65	<0.001
12.60	218	Threonine	31.933	<0.001	1.43	1.72	<0.001	1.72	0.64	<0.001
5.87	107	Glutathione	14.065	<0.001	1.40	0.79	<0.001	1.45	1.20	0.002
15.42	176	Methionine	12.485	<0.001	1.32	1.44	<0.001	1.35	0.78	0.005
17.04	202	Indolelactate	11.250	<0.001	1.10	0.55	0.130	1.46	2.92	<0.001

RT, retention time; MT, melatonin; VIP, variable influence on projection.