div class="section level2">
<h2 id="reusable-code">Reusable code<a class="anchor" aria-label="anchor" href="#reusable-code"></a>
</h2>
<p><em>Preparation.</em>   The data frame of baseline IDs is the intake
for this section.</p>
<div class="sourceCode" id="cb21"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="va">DT</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/pkg/data.table/man/copy.html" class="external-link">copy</a></span><span class="o