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| Term | Coefficient | p-value |
| Intercept | 6.424±1.20 | |
| dpi | −0.356±0.094 | <0.01 |
| dpi2 | 0.006±0.002 | <0.01 |
| RMCPII | 1.140±0.355 | <0.01 |
| dpi:RMCPII | −0.045±0.015 | <0.01 |
AIC = 532.4, k 1.61±0.32, residual df = 54
