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Variables and Their Corresponding Levels Implemented for the Construction of Box–Behnken Design
| Code | Independent variables (w/w) | Levels | ||
|---|---|---|---|---|
| Low (−1) | Medium (0) | High (+1) | ||
| X 1 | Carbopol content | 0.75 | 1.0 | 1.25 |
| X 2 | Capryol 90 concentration | 5.0 | 7.5 | 10 |
| X 3 | Drug concentration | 0.5 | 0.6 | 0.7 |
