protected function generateStructuredSummaryTable()
{
$gender_data = $this->generateStructuredGenderHeader();
$year_header = $this->generateStructuredYearHeader();
$postcode_header = $this->generateStructuredPostcodeHeader();
$space_holder = array('');
return array(0 => array_merge($gender_data, $space_holder, $year_header, $space_holder, $space_holder, $postcode_header));
}