Source below: includes use of scope="col". With this, audio browsers can remind the listener what column they are in. Admittedly the content would give them a good idea in this example.

      <table border="1"
             summary="Example of a...">

           <CAPTION class="large_bold">Accessible table</CAPTION>
           <tr>  
                <th scope="col">Name</th>
                <th scope="col">Best time</th>
                <th scope="col" abbr="Type">Type of Competition</th>
                <th scope="col">Distance</th>
           </tr>
           <tr>
                <td>A. Runner</td>
                <td>30 mins</td>
                <td>Cross country</td>
                <td>5 miles</td>
           </tr>
           <tr>
                <td>B. Runner</td>
                <td>5 mins</td>
                <td>Track</td>
                <td>1500m</td>
           </tr>
       </table>