| fev | Coef. | Std. Err. | t | P>|t| | [95% Conf. Interval] | |
| _Itreat_3 | .2261827 | .1028346 | 2.20 | 0.029 | .0228754 | .42949 |
| base | .6894261 | .0933944 | 7.38 | 0.000 | .5040403 | .8748119 |
| _cons | .4669997 | .2112431 | 2.21 | 0.030 | .0473954 | .8866041 |
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