Table 2.
Variation of metabolite ratios in repeated examinations of the controls
| Metabolite ratio | Change in repeated examinations (%) | Change estimated not to be method-related (%) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Right | Left | Control 1 | Control 2 | Control 3 | Control 4 | ||||||
| Mean ± SD, range | Mean ± SD, range | Right | Left | Right | Left | Right | Left | Right | Left | ||
| Cho/Cr | 0.31 ± 0.03, 0.28–0.33 | 0.33 ± 0.02, 0.32–0.35 | +17 | +13 | −7 | +13 | +9 | +11 | −4 | +4 | ± 25 |
| NAA/Cr | 1.18 ± 0.08, 1.11–1.29 | 1.30 ± 0.08 1.22–1.38 | +21 | −24 | −7 | −8 | +5 | +11 | +8 | +15 | ± 35 |
| Ins/Cr | 0.91 ± 0.06, 0.85–0.99 | 0.98 ± 0.07 0.93–1.06 | +4 | −9 | −22 | +12 | +0.3 | + 3 | +0.7 | +13 | ± 30 |
Ratios in the second examinations are compared with those in the first examination.
Cho, choline; Cr, creatine; NAA, N-acetyl aspartate; Ins, myoinositol; SD, standard deviation.