an class="r-pr">#&gt;</span> Reference level:  = 0 </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Contrast:  difference </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Time:  1 </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   X    estimate       lower    upper</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1 0  0.00000000  0.00000000 0.000000</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 2 1 -0.01202936 -0.08167224 0.063079</span>