| Term | β | SE | T-value | p-value | VIF |
| Constant | 29.604 | 0.512 | 57.85 | 0.000 | |
| SP | −2.313 | 0.132 | −17.48 | 0.000 | 17.09 |
| A | −0.02063 | 0.00358 | −5.76 | 0.000 | 1.06 |
| SP2 | 0.05492 | 0.00621 | 8.84 | 0.000 | 17.28 |
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