<prompt> Back of 10 - 14 years old contributes how much percentage to total body surface area -13151619  <response>: According to Lund Browder classification for the 10-14yr back of the trunk is 16. Front of the trunk 16 Head and neck 13 Upper limb 19 Lower limb 34 REF: The Synopsis of Forensic Medicine and Toxicology 29th edition page no: 160. 