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Regression analysis results
| Predictor | Coefficient | T value | Probability |
| Constant | 52.0270 | 6.76 | 0.000 |
| Pulp density % | -66.3470 | -14.05 | 0.000 |
| Surface area | -32.5570 | -6.89 | 0.000 |
| Ferric chloride | -21.0730 | -4.46 | 0.000 |
| Carbon dioxide | -12.5350 | -2.65 | 0.009 |
| Air | 29.3000 | 6.20 | 0.000 |
| 9 K medium | 29.3010 | 6.20 | 0.000 |
| Strain | 3.0020 | 0.64 | 0.526 |
| Days | 3.9396 | 14.41 | 0.000 |
