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

Table 2

Descriptive statistics of GSH, GSSG, and KP metabolites for each group (normal and detected cognitive impairment (CI)).

	Min	Percentile 25	Median	Mean	Percentile 75	Max
GSH (μmol/l)
Total	53.760	151.030	196.860	209.920	236.740	766.000	79
Normal	53.760	148.710	187.210	206.580	220.590	766.000	48
CI	129.700	165.100	218.800	213.900	253.300	340.400	18
GSSG (μmol/l)
Total	0.090	12.650	40.180	39.700	62.800	118.780	79
Normal	0.090	14.480	41.440	41.750	63.470	118.780	48
CI	7.410	19.430	40.720	43.260	67.950	85.270	18
Trp (pmoles/μl)
Total	2.380	11.450	22.740	26.360	37.290	87.600	82
Normal	3.401	15.802	23.370	28.208	35.173	87.599	48
CI	2.380	5.017	11.472	15.384	17.506	47.816	21
KYNA (fmoles/μl)
Total	0.832	2.708	4.525	10.534	6.662	209.894	79
Normal	0.832	2.514	4.465	13.325	7.191	209.894	47
CI	1.694	2.768	3.731	4.595	4.908	15.561	19
3-HK (pmoles/μl)
Total	0.000	0.025	0.036	0.046	0.053	0.376	82
Normal	0.000	0.025	0.041	0.050	0.057	0.376	48
CI	0.006	0.026	0.036	0.045	0.052	0.155	21
L-Kyn (pmoles/μl)
Total	0.000	3.478	12.513	20.305	22.417	283.361	80
Normal	0.015	5.636	14.697	20.158	22.820	224.934	47
CI	2.174	6.396	12.513	14.127	17.542	39.094	20