the drug for one year, their CD4 counts were again recorded.
The aim of the experiment was to show that patients taking the drug had
increased CD4 counts which is not generally seen in HIV-positive patients.
</p>


<h3>Usage</h3>

<pre><code class='language-R'>cd4
</code></pre>


<h3>Format</h3>

<p>This data frame contains the following columns:
</p>

<dl>
<dt><code>baseline</code></dt><dd>
<p>The CD4 counts (in 100's) on admission to the trial.
</p>
</dd>
<dt><code>oneyear </code></dt><dd>
<p>The CD4 coun