| _ESa | Coef. | Std. Err. | t | P > t | (95% Conf. | Interval) |
| difcal | .0459442 | .0578779 | 0.79 | 0.453 | −.0909154 | .1828038 |
| _Icatcal_1 | .8943999 | .5321506 | 1.68 | 0.137 | −.3639364 | 2.152736 |
| _Icatcal_2 | .4275402 | .5473569 | 0.78 | 0.460 | −.8667533 | 1.721834 |
| _cons | −.9390958 | .6599035 | −1.42 | 0.198 | −2.49952 | .621328 |
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