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Table 1 Demographics of the study population

From: Association between the ABO blood group and the human intestinal microbiota composition

  Blood group
  A B AB O
Female 17 (85%) 11 (92%) 12 (92%) 17 (89%)
Male 3 (15%) 1 (8%) 1 (8%) 2 (11%)
Total* 20 12 13 19
Rh+ 19 (95%) 10 (83%) 12 (92%) 19 (100%)
Rh- 1 (5%) 2 (17%) 1 (8%) 0
Average age** 44 (33–58) 43 (31–57) 48 (39–58) 46 (31–61)
  1. 79 persons were recruited to the study. Exclusion criteria in the recruitment were: diagnosed gastrointestinal disorders, antibiotic treatment in past two months, pregnancy, problems in blood coagulation, vegetarian diet and age below 18 or over 61. In addition, non-secretor persons (15) were excluded, thus the final study pool was 64 persons. Average age is presented together with the age range of each ABO blood group. Rh +/− states the presence/absence of the Rhesus-factor in blood.
  2. *No statistical difference (P > 0.95) was detected in participant numbers between blood groups.
  3. ** No statistical difference (P > 0.45) was detected in participant age distribution between blood groups.