NAA/Cho and NAA/PCr metabolite ratios and absolute molar concentrations of NAA, Cho, and PCr (mmol/L brain tissue, mM) for patient subgroups and healthy controls (group Ia)
| Group | NAA/Cho | NAA/PCr | NAA (mM) | Cho (mM) | PCr (mM) |
|---|---|---|---|---|---|
| IV* mean | 1.72 | 1.62 | 9.79 | 1.88 | 8.19 |
| SD | 0.20 | 0.11 | 0.70 | 0.21 | 0.70 |
| III mean | 2.08 | 1.83 | 10.36 | 1.64 | 7.61 |
| SD | 0.36 | 0.18 | 1.92 | 0.21 | 1.03 |
| II mean | 2.10 | 1.78 | 10.26 | 1.60 | 7.78 |
| SD | 0.25 | 0.09 | 1.77 | 0.23 | 1.16 |
| Ia mean | 2.11 | 1.82 | 12.64 | 2.00 | 9.15 |
| SD | 0.14 | 0.12 | 1.16 | 0.21 | 1.24 |
Note:—NAA indicates N-acetylaspartate; Cho, choline; PCr, phosphocreatine.
* Both metabolite ratios are lowest in group IV.