| Term | Estimate | Standard Error | t Ratio | P-value |
| Intercept | 9.2933 | 0.1132 | 82.06 | <0.0001* |
| X1 | 1.2625 | 0.0693 | 18.21 | <0.0001* |
| X2 | 0.6425 | 0.0693 | 9.26 | 0.0002* |
| X3 | 0.955 | 0.0693 | 13.77 | <0.0001* |
| X1X2 | −0.335 | 0.0981 | −3.42 | 0.0189* |
| X1X3 | 0.37 | 0.0981 | 3.77 | 0.0130* |
| X2X3 | −0.745 | 0.0981 | −7.6 | 0.0006* |
| X1X1 | 0.9783 | 0.1021 | 9.58 | 0.0002* |
| X2X2 | 0.4633 | 0.1021 | 4.54 | 0.0062* |
| X3X3 | −0.2317 | 0.1021 | −2.27 | 0.0725 |