| Term | β | SE | T-value | p-value | VIF |
| Constant | 25.795 | 0.667 | 38.70 | 0.000 | |
| SP | −1.1785 | 0.0787 | −14.97 | 0.000 | 1.04 |
| A | −0.02492 | 0.00857 | −2.91 | 0.010 | 1.04 |
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