=============| 100%</div><div class='input'><span class='co'># summary results:</span>
<span class='fu'><a href='https://rdrr.io/r/base/summary.html'>summary</a></span>(<span class='no'>tree</span>)</div><div class='output co'>#&gt;                  mean CI_low CI_high
#&gt; intercept      -0.751 -0.768  -0.733
#&gt; se.intercept    0.269  0.267   0.272
#&gt; pval.intercept  0.006  0.004   0.009
#&gt; estimate        0.512  0.505   0.519
#&gt; se.estimate     0.098  0.098   0.099
#&gt; pval.estimate   0.000