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Inter-assay precision and accuracy in relation to storage condition. N = 12 for all replicates except for ∗ where n = 6 because only the D2 and D6 time points were considered to be stable under these storage conditions.
| Compound | Storage Condition | Inter-assay Bias | Inter-assay precision |
|---|---|---|---|
| NMN | RT | 7.6% | 5.3% |
| 4 °C | 4.0% | 4.0% | |
| −20 °C | 6.8% | 6.5% | |
| MN | RT | 7.7% | 12.9% |
| 4 °C | 5.3% | 12.9% | |
| −20 °C | 6.5% | 13.6% | |
| 3-MT | RT | 12.1% | 7.3% |
| 4 °C | 12.0% | 4.0%∗ | |
| −20 °C | 11.3% | 10.8%∗ | |
