| _ESa | Coef. | Std. Err. | t | P > t | (95% Conf. | Interval) |
| difcal | .0227448 | .0664972 | 0.34 | 0.750 | −.1618811 | .2073708 |
| _Icatcal_1 | .5450151 | .5673605 | 0.96 | 0.391 | −1.03023 | 2.12026 |
| _Icatcal_2 | −.1219102 | .7756573 | −0.16 | 0.883 | −2.27548 | 2.03166 |
| typepat | −.2502513 | .5116285 | −0.49 | 0.650 | −1.67076 | 1.170257 |
| _cons | −.3512504 | .7353122 | −0.48 | 0.658 | −2.392804 | 1.690304 |
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