Estimate Std. Error z value P__________
(Intercept) 0.3844 0.2496 1.540 0.1236
region 0.09650 0.06727 1.434 0.1515
age 0.03562 0.001873 19.016 <0.001 ***
length 0.002054 0.0006735 3.050 0.00229 **