<p><code>"low"</code> or <code>"high"</code> or <code>"N/A"</code> (at ages other than
30 and 60 months). 
</p>
</dd>
<dt><code>Age</code></dt><dd>
<p>Age of the subject (months).
</p>
</dd>
<dt><code>Loud</code></dt><dd>
<p>Loudness of stimulus, in decibels.
</p>
</dd>
<dt><code>Noise</code></dt><dd>
<p>Whether the signal in the stimulus was <code>"coherent"</code> or
<code>"incoherent"</code>.
</p>
</dd>
<dt><code>Correct</code></dt><dd>
<p>Number of correct responses from <code>Trials</code> trials.
</p>