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Factors, symbols, and levels used in the Box–Behnken design for the nanoemulsions involving PC essential oil.
| Symbol | Independent Variable | Actual Levels at Coded Factor Levels | ||
|---|---|---|---|---|
| Low (−1) | Middle (0) | High (1) | ||
| S1 | TW80 (%) | 4.71 | 7.66 | 10.61 |
| S2 | PC-EO (%) | 0.456 | 0.547 | 0.638 |
| S3 | Water (%) | 88.41 | 91.34 | 94.26 |
