title: ABO blood groups and age groups in surgical venous thromboembolism.
abstract: In a series of cases of surgical thromboembolism there were significant age differences in the ratio of cases of blood group A to those of blood group O, the ratio being highest in the youngest age groups.
mesh_terms: D000017:ABO Blood-Group System; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000097:blood*; D013923:Thromboembolism / Q000097:blood*
chemical_list: D000017:ABO Blood-Group System