See W3C documentation for the XHTML table model.
One cell in the table header, as opposed to an ordinary cell in a table
(#PCDATA | ext-link | hr | related-article | inline-supplementary-material | disp-formula | break | mixed-citation | bold | italic | monospace | overline | roman | sans-serif | sc | strike | underline | chem-struct | inline-formula | def-list | list | mml:math | abbrev | milestone-end | milestone-start | named-content | styled-content | alternatives | graphic | preformat | inline-graphic | target | xref | sub | sup)*
Any combination of:
... <floats-group> <table-wrap id="tbl1" position="float"> <label>1</label> <caption><title>Age Group Differences in Central Study Variables</title></caption> <graphic copyright="inherit" id="tbl1a" xlink:href="pag_28_1_148_tbl1a.tif"/> <table> <colgroup> <col align="left"/> <col align="char" char="."/> <col align="char" char="."/> <col align="left"/> <col align="char" char="."/> </colgroup> <thead valign="bottom" align="center"> <tr> <th></th> <th>Younger adults <italic>M</italic> (<italic>SD</italic>)</th> <th>Older adults <italic>M</italic> (<italic>SD</italic>)</th> <th>Age group difference</th> <th>Cohen's <italic>d</italic></th></tr> </thead> <tfoot valign="top"> <tr> <td align="left" colspan="5"><sup>a</sup> <italic>n</italic> = 197. <sup>b</sup> Fixed effect and random variation around fixed effect (<italic>SD</italic>) generated with multilevel modeling.</td></tr> <tr> <td align="left" colspan="5">∗ <italic>p</italic> = .05.</td></tr> </tfoot> <tbody valign="top"> <tr> <td>Number of days with stressors</td> <td>37 (27)</td> <td>25 (25)</td> <td><italic>F</italic>(1, 202) = 10.36*</td> <td>0.46</td></tr> ...</tbody> </table> </table-wrap> </floats-group> ...
xhtml-table-1.mod