| fev | Coef. | Std. Err. | t | P>|t| | [95% Conf. Interval] | |
| _Itreat_3 | .3230728 | .1042794 | 3.10 | 0.002 | .1163241 | .5298215 |
| base | .7240691 | .0861441 | 8.41 | 0.000 | .5531672 | .8949709 |
| _cons | .3959986 | .1971734 | 2.01 | 0.048 | .0043602 | .787637 |
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