, default), bars represent
case counts</p></td>
    </tr>
    <tr>
      <th>na.rm</th>
      <td><p>If <code>TRUE</code>, this removes NA counts from the age groups. Defaults
to <code>TRUE</code>.</p></td>
    </tr>
    <tr>
      <th>show_midpoint</th>
      <td><p>When <code>TRUE</code> (default), a dashed vertical line will be
added to each of the age bars showing the halfway point for the
un-stratified age group. When <code>FALSE</code>, no halfway point is marked.</p></td>
    </tr>
    <tr>
      <th