| logrra | Coef. | Std. Err. | t | P > t | (95% Conf. | Interval) |
| difcal | .0237277 | .0333315 | 0.71 | 0.528 | −.0823481 | .1298035 |
| _Icatcal_2 | .2621164 | .2656104 | 0.99 | 0.396 | −.5831745 | 1.107407 |
| typepatient | −.3222415 | .8614032 | −0.37 | 0.733 | −3.063611 | 2.419128 |
| _cons | −.2805905 | .1894936 | −1.48 | 0.235 | −.8836437 | .3224628 |
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