tive use at time of survey</p>
</dd>
<dt>livch</dt><dd><p>Number of living children at time of survey - an
ordered factor.  Levels are <code>0</code>, <code>1</code>, <code>2</code>, <code>3+</code></p>
</dd>
<dt>age</dt><dd><p>Age of woman at time of survey (in years), centred around
mean.</p>
</dd>
<dt>urban</dt><dd><p>Type of region of residence - a factor.  Levels are
<code>urban</code> and <code>rural</code></p>
</dd>
</dl>



<h3>Source</h3>

<p><a href="http://www.bristol.ac.uk/cmm/learning/mmsoftwar