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answers:

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see image here: http://www.x-reference.com/wp-content/uploads/2010/05/nested-table-data.gif

How should I write the code for the section entitled "Retiree and Employee On Demand Community" so that screen readers don't get confused on it?

A nested table doesn't seem to be the best solution, it doesn't seem semantic either. The data in the columns is part of the column headings these are just sub-sections of that particular table row.

What I have so far:

<table cellspacing="0" cellpadding="0" border="0" summary="2009 Employee Metrics" class="data-table alternating">
                                <thead>
                                    <tr>
                                        <th scope="col"></th>
                                        <th scope="col">2005</th>
                                        <th scope="col">2006</th>
                                        <th scope="col">2007</th>
                                        <th scope="col">2008</th>
                                        <th scope="col">2009</th>
                                    </tr>
                                </thead>
                                <tbody>
                                    <tr>
                                        <th scope="row" class="table-row">Learning Investments Worldwide <span>($ M)</span></th>
                                            <td>648</td>
                                            <td>682</td>
                                            <td>622</td>
                                            <td>648</td>
                                            <td>490</td>
                                    </tr>
                                    <tr>
                                        <th scope="row" class="table-row">Learning Hours Worldwide <span>($ M)</span></th>
                                            <td>648</td>
                                            <td>682</td>
                                            <td>622</td>
                                            <td>648</td>
                                            <td>490</td>
                                    </tr>
                                    <tr>
                                        <th scope="row" class="table-row">Learning Per Employee</th>
                                            <td>648</td>
                                            <td>682</td>
                                            <td>622</td>
                                            <td>648</td>
                                            <td>490</td>
                                    </tr>
                                    <tr>
                                        <th scope="row" class="table-row">Employee Satisfaction</th>
                                            <td>648</td>
                                            <td>682</td>
                                            <td>622</td>
                                            <td>648</td>
                                            <td>490</td>
                                    </tr>
                                    <tr>
                                        <th scope="row" class="table-row">Women global Executives <span>(%)</span></th>
                                            <td>648</td>
                                            <td>682</td>
                                            <td>622</td>
                                            <td>648</td>
                                            <td>490</td>
                                    </tr>
                                    <tr>
                                        <th scope="row" class="table-row">Women in Workforce <span>(%)</span></th>
                                            <td>648</td>
                                            <td>682</td>
                                            <td>622</td>
                                            <td>648</td>
                                            <td>490</td>
                                    </tr>                                       
                                    <tr>
                                        <th scope="row" class="table-row">Women Managers in Workforce <span>(%)</span></th>
                                            <td>648</td>
                                            <td>682</td>
                                            <td>622</td>
                                            <td>648</td>
                                            <td>490</td>
                                    </tr>
                                    <tr>
                                        <th scope="row" class="table-row">Global Illness/Injury Rate<br /> <span>Total Number (per 100 employees)</span></th>
                                            <td>648</td>
                                            <td>682</td>
                                            <td>622</td>
                                            <td>648</td>
                                            <td>490</td>
                                    </tr>
                                    <tr>
                                        <th scope="row" class="table-row" colspan="6">Retiree and Employee On Demand Community<br /> <span>(Hours in thousands)</span>
                                        <table cellspacing="0" cellpadding="0" border="0" summary="Retiree and Employee On Demand Community" class="data-table">
                                                <tbody>
                                                    <tr>
                                                        <th scope="row" class="table-row"><span>Asia Pacific</span></th>
                                                            <td>648</td>
                                                            <td>682</td>
                                                            <td>622</td>
                                                            <td>648</td>
                                                            <td>490</td>
                                                    </tr>
                                                    <tr>
                                                        <th scope="row" class="table-row"><span>Asia Pacific</span></th>
                                                            <td>648</td>
                                                            <td>682</td>
                                                            <td>622</td>
                                                            <td>648</td>
                                                            <td>490</td>
                                                    </tr>
                                                    <tr>
                                                        <th scope="row" class="table-row"><span>Asia Pacific</span></th>
                                                            <td>648</td>
                                                            <td>682</td>
                                                            <td>622</td>
                                                            <td>648</td>
                                                            <td>490</td>
                                                    </tr>
                                                </tbody>
                                        </table>
                                        </th>
                                    </tr>
                                </tbody>
                            </table> 

Thank you!