The values obtained in the central composite model for removing PR.
| Regression coefficients | PR conversion, % | p-Value of αi and αii |
|---|---|---|
| α 0 | 97 | |
| α 3 | 7 | 0.021 |
| α 4 | 9 | 0.006 |
| α 33 | −23 | <0.001 |
| α 44 | −25 | <0.001 |
| R 2 | 0.957 |
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