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Table 1 Baseline characteristics of Golestan Cohort Study participants by blood group phenotypes

From: Mortality and cancer in relation to ABO blood group phenotypes in the Golestan Cohort Study

Variable   O (number = 14,971) A (number = 16,705) B (number = 13,555) AB (number = 4,810) Rh + (number = 46,805) Rh-(number = 3,238)
Sex female 8738 (58.4) 9555 (57.2) 7760 (57.2) 2757 (57.3) 26974 (57.6) 1837 (56.7)
  male 6233 (41.6) 7150 (42.8) 5795 (42.8) 2053 (42.7) 19831 (42.4) 1401 (43.3)
Age a   52.1 (9) 52.1 (9) 52.2 (9.1) 52.1 (9) 52.1 (9.0) 52.2 (8.9)
Ethnicity Turkmen 10836 (72.4) 12677 (75.9) 10033 (74) 3705 (77) 35060 (74.9) 2192 (67.7)
  non-Turkmen 4135 (27.6) 4028 (24.1) 3522 (26) 1105 (23) 11745 (25.1) 1046 (32.3)
Residence urban 3022 (20.2) 3257 (19.5) 2794 (20.6) 955 (19.9) 9247 (19.8) 783 (24.2)
  rural 11949 (79.8) 13448 (80.5) 10761 (79.4) 3855 (80.1) 37558 (80.2) 2455 (75.8)
Education none 10388 (69.4) 11785 (70.5) 9514 (70.2) 3431 (71.3) 32919 (70.3) 2199 (67.9)
  Up to 8 years 3246 (21.7) 3547 (21.2) 2910 (21.5) 1004 (20.9) 9985 (21.3) 723 (22.3)
  High school 993 (6.6) 1019 (6.1) 855 (6.3) 288 (6) 2929 (6.3) 226 (7)
  University 344 (2.3) 354 (2.1) 276 (2) 87 (1.8) 972 (2.1) 90 (2.8)
Smoking pack-year Non-smoker 11751 (78.5) 13149 (78.7) 10581 (78.1) 3753 (78) 36685 (78.4) 2551 (78.8)
Q1 (≤3) 858 (5.7) 934 (5.6) 783 (5.8) 272 (5.7) 2682 (5.7) 165 (5.1)
Q2 (3 to 10) 772 (5.2) 880 (5.3) 695 (5.1) 233 (4.8) 2406 (5.1) 174 (5.4)
Q3( 10 to 24) 820 (5.5) 900 (5.4) 757 (5.6) 289 (6) 2581 (5.5) 185 (5.7)
Q4 (>24) 770 (5.1) 842 (5) 739 (5.5) 263 (5.5) 2451 (5.2) 163 (5)
Opium use   2535 (16.9) 2854 (17.1) 2306 (17) 804 (16.7) 7977 (17) 523 (16.2)
Socioeconomic status Low 4065 (27.2) 4703 (28.2) 3803 (28.1) 1366 (28.4) 13054 (27.9) 884 (27.3)
Low-middle 3268 (21.8) 3699 (22.1) 3092 (22.8) 1085 (22.6) 10464 (22.4) 680 (21)
High-middle 3740 (25) 4286 (25.7) 3392 (25) 1167 (24.3) 11792 (25.2) 793 (24.5)
High 3898 (26) 4017 (24) 3268 (24.1) 1192 (24.8) 11495 (24.6) 881 (27.2)
Medical history at baseline CVD 959 (6.4) 1007 (6) 803 (5.9) 282 (5.9) 2834 (6.1) 217 (6.7)
Hypertension 2968 (19.8) 3284 (19.7) 2726 (20.1) 896 (18.6) 9264 (19.8) 611 (18.9)
DM 999 (6.7) 1178 (7.1) 952 (7) 325 (6.8) 3224 (6.9) 230 (7.1)
Cancer 52 (0.4) 56 (0.3) 34 (0.3) 17 (0.4) 149 (0.3) 10 (0.3)
  1. aNumbers show frequencies (percentage) except for age which is mean (SD). CVD, cardiovascular disease; DM, diabetes mellitus.