| Term | Estimate | Standard Error | t Ratio | P-value |
| Intercept | 10.79 | 0.2358 | 45.75 | <.0001* |
| X1 | 3.0875 | 0.1444 | 21.38 | <.0001* |
| X2 | 1.4288 | 0.1444 | 9.89 | 0.0002* |
| X3 | 0.0963 | 0.1444 | 0.67 | 0.5346 |
| X1X2 | −0.1825 | 0.2042 | −089 | 0.4125 |
| X1X3 | 0.0375 | 0.2042 | 0.18 | 0.8615 |
| X2X3 | −0.405 | 0.2042 | −1.98 | 0.1042 |
| X1X1 | 0.7975 | 0.2126 | 3.75 | 0.0133* |
| X2X2 | −0.315 | 0.2126 | −1.48 | 0.1985 |
| X3X3 | −1.325 | 0.2126 | −6.23 | 0.0016* |