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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.