<td>
  Level 1
  <br>
    Attribute A: 24%
  <br>
    Attribute B: 14%
  <br>
    Attribute C: 15.5%
</td>

row.xpath('tr').each_with_index do |td, j|
  split_array << td.text.squish.split('%')
end

[["Level: 1 Attribute A: 24", "Attribute B: 14", "Attribute C, 15.5"],["Level: 2 Atribute A: 36", ..etc]..etc]

[{:statistic => "Attribute A", :level_1 => 24.0},{:statistic => "Attribute B", :level_1 => 14.0},{:statistic => "Attribute C", :level_1 => 15.5}]