Low Serum Tryptophan Levels as an Indicator of Global Cognitive Performance in Nondemented Women over 50 Years of Age

Table 3

Descriptive statistics of Trp levels and Kyn/Trp, KYNA/Trp, and 3-HK/Trp ratios for each group (normal and detected cognitive impairment (CI)).

	Trp		Kyn/Trp		KYNA/Trp		3-HK/Trp
	Normal	CI	Normal	CI	Normal	CI	Normal	CI
Descriptive statistics
Percentile 25	15.802	5.017	0.198	0.359	0.117	0.236	0.001	0.001
Median	23.370	11.472	0.579	0.856	0.191	0.459	0.002	0.003
Percentile 75	35.173	17.506	1.045	3.094	0.352	0.686	0.003	0.005
Mean	28.208	15.384	0.915	2.120	0.454	0.661	0.003	0.007
	48	21	47	18	46	19	47	21
values
Mann-Whitney test	0.0015		0.0700		0.0280		0.0262
-test	0.0017		0.0350		0.0306		0.0189