>
<span class="r-out co"><span class="r-pr">#&gt;</span> Fixed effects in the longitudinal model:</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>                      coef      Se    Wald p-value</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> intercept class1 20.70604 0.64004  32.351 0.00000</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> intercept class2 29.39251 0.54893  53.545 0.00000</span>
<span cl