Table 2:

Normative mean absolute metabolite concentrations and ratios per GA in weeks for the whole cohort^{^a}

	GA, wk
	18–20	20–22	22–24	24–26	26–28	28–30	30–32	32–34	34–36	36–38	38–40
tNAA, mM/kg	1.87 ± 0.62	3.01 ± 0.91	2.63 ± 0.96	3.76 ± 1.07	3.32 ± 0.78	4.09 ± 0.77	4.27 ± 1.05	4.96 ± 1.44	5.69 ± 1.24	6.52 ± 1.50	7.58 ± 1.27
tCho, mM/kg	2.55 ± 0.72	3.15 ± 0.65	3.12 ± 0.89	3.58 ± 0.85	3.13 ± 0.40	3.16 ± 0.46	3.15 ± 0.52	3.29 ± 0.64	3.43 ± 0.37	3.44 ± 0.75	3.70 ± 0.65
tCr, mM/kg	2.34 ± 0.83	2.59 ± 0.58	2.72 ± 0.71	3.30 ± 1.06	3.21 ± 0.50	3.68 ± 0.52	3.81 ± 0.69	4.28 ± 0.64	4.78 ± 0.96	5.01 ± 0.79	5.37 ± 0.63
tNAA:tCho	0.76 ± 0.21	0.95 ± 0.22	0.85 ± 0.21	1.07 ± 0.32	1.06 ± 0.20	1.31 ± 0.24	1.37 ± 0.30	1.50 ± 0.31	1.66 ± 0.29	1.93 ± 0.43	2.07 ± 0.26
tNAA:tCr	0.89 ± 0.36	1.17 ± 0.28	0.97 ± 0.24	1.25 ± 0.61	1.04 ± 0.22	1.12 ± 0.24	1.14 ± 0.29	1.17 ± 0.32	1.23 ± 0.32	1.32 ± 0.32	1.41 ± 0.15
tCho:tCr	1.14 ± 0.24	1.25 ± 0.26	1.14 ± 0.13	1.17 ± 0.44	0.99 ± 0.11	0.86 ± 0.11	0.84 ± 0.12	0.78 ± 0.16	0.74 ± 0.16	0.69 ± 0.10	0.69 ± 0.09
tCr:tCho	0.91 ± 0.20	0.83 ± 0.18	0.88 ± 0.10	0.95 ± 0.31	1.02 ± 0.10	1.17 ± 0.14	1.21 ± 0.16	1.33 ± 0.27	1.39 ± 0.17	1.49 ± 0.23	1.47 ± 0.19

↵a Values are rounded to 2 decimal places.