Coefficient

std. err.

z

P > |z|

[95% conf. interval]

_bs_1

0.021177

0.004514

4.69

0.001

[0.0123291, 0.0300249]

_bs_2

0.01994

0.005445

−23.66

0.001

[−0.030611, −0.009268]