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Stepwise Regression Analysis of ZPR.
| Variable | Parameter Estimate | Standard Error | Probability | Partial R-Square | Model R-Square |
| Intercept | 1.068 | 0.929 | 0.2577 | 0.943 | |
| ZBR | 0.732 | 0.053 | < 0.0001 | 0.9256 | |
| TNT | –0.278 | 0.088 | 0.0033 | 0.0131 | |
| IPR | 0.510 | 0.299 | 0.0974 | 0.0046 |
