Method precision for bupivacaine hydrochloride and fentanyl citrate
| Bupivacaine hydrochloride | |
| Average | 6.2635 |
| Variance: s2 | 1.89×10–3 |
| SD: s | 0.04354 |
| Relative SD: Sy | 0.00695 |
| Coefficient of variation: Wz | 0.70% |
| Fentanyl citrate | |
| Average | 0.1666 |
| Variance: s2 | 8.63×10–6 |
| SD: s | 0.00294 |
| Relative SD: Sy | 0.01763 |
| Coefficient of variation: Wz | 1.76% |