Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
1961 Danish electoral age referendum
Table title:
Results
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Choice </th><th colspan=1 rowspan=1 > Votes </th><th colspan=1 rowspan=1 > % </th></tr>
<tr> <td colspan=1 rowspan=1 > For </td><td colspan=1 rowspan=1 > 586,113 </td><td class="highlighted"  colspan=1 rowspan=1 > 55.0 </td></tr>
<tr> <td colspan=1 rowspan=1 > Against </td><td colspan=1 rowspan=1 > 479,146 </td><td colspan=1 rowspan=1 > 45.0 </td></tr>
<tr> <td colspan=1 rowspan=1 > Invalid/blank votes </td><td colspan=1 rowspan=1 > 9,299 </td><td colspan=1 rowspan=1 > – </td></tr>
<tr> <td colspan=1 rowspan=1 > Total </td><td colspan=1 rowspan=1 > 1,074,558 </td><td colspan=1 rowspan=1 > 100 </td></tr>
<tr> <td colspan=1 rowspan=1 > Registered voters/turnout </td><td colspan=1 rowspan=1 > 2,880,337 </td><td class="highlighted"  colspan=1 rowspan=1 > 37.3 </td></tr>
<tr> <td colspan=3 rowspan=1 > Source: Nohlen & Stöver </td></tr>
</table>
Question:
What was the approval rate for the referendum and what was the voter turnout?
Answer:
The Danish electoral age referendum was approved by 55% of voters, with a 37.3% turnout.