 <span class="op">=</span> <span class="st">"AVISIT"</span>,</span>
<span>    group <span class="op">=</span> <span class="st">"TRT"</span>,</span>
<span>    outcome <span class="op">=</span> <span class="st">"CHG"</span>,</span>
<span>    covariates <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"BASE"</span>, <span class="st">"STRATA"</span>, <span class="st">"REGION"</span><span class="op">)</s