| variable | regression coefficient | t test value | p value |
| c | 1.552 | 32.794 | 0.000* |
| lntii | 0.610 | 15.056 | 0.000* |
| lnfai | 0.019 | 3.356 | 0.001* |
| lnfdi | 0.017 | 3.799 | 0.000* |
| lniet | 0.103 | 10.179 | 0.000* |
| lnfbe | −0.080 | −4.341 | 0.000* |
| lnrd | 0.046 | 3.221 | 0.001* |
| lnocs | −0.019 | −1.869 | 0.062*** |
| lnrde | 0.220 | 5.950 | 0.000* |