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Summary of the models and estimated parameters of polyphenol degradation during the roasting of three coffee varieties.
| Variety | Model | R 2 | Sig.* |
| Bourbon | Linear | 0.388 | 0.000 |
| Quadratic | 0.639 | 0.000 | |
| Cubic | 0.670 | 0.000 | |
| Caturra | Linear | 0.169 | 0.013 |
| Quadratic | 0.523 | 0.000 | |
| Cubic | 0.635 | 0.000 | |
| Catimor | Linear | 0.582 | 0.000 |
| Quadratic | 0.793 | 0.000 | |
| Cubic | 0.865 | 0.000 |
*Statistical significance of the regression model.
