Table 2. Proportion (mean ± SD) of variance attributable to each source of variation relative to the total variation in metabolite intensity across all metabolites.
| Within-Day Variability | Between-Day Variability | ||||||
| Source of variance | Meal effects | Time of day effects | Day-to-Day effects | ||||
| Day 1 | Day 1 | Day 2 | Day 3 | Day 1 | Days 1–3 | ||
| (+1 &+3) | (+9 &+11) | (+1 &+3) | (+1 &+3) | (hours +1 to +14) | (only +1 hour) | ||
| Meal | 0.076±0.14 | 0.036±0.08 | 0.087±0.15 | 0.062±0.13 | 0.084±0.13 | 0.023±0.039 | |
| Urine | Patient | 0.396±0.22 | 0.306±0.21 | 0.228±0.21 | 0.28±0.24 | 0.249±0.19 | 0.306±0.17 |
| Residuals | 0.528±0.24 | 0.658±0.22 | 0.685±0.23 | 0.658±0.25 | 0.667±0.22 | 0.670±0.18 | |
| Meal | 0.025±0.04 | 0.007±0.03 | 0.041±0.07 | 0.009±0.02 | 0.027±0.04 | 0.01±0.02 | |
| Blood | Patient | 0.35±0.28 | 0.37±0.29 | 0.36±0.24 | 0.362±0.29 | 0.322±0.26 | 0.287±0.24 |
| Residuals | 0.625±0.27 | 0.623±0.29 | 0.599±0.23 | 0.628±0.29 | 0.651±0.26 | 0.703±0.24 | |