Table 1.
Baseline characteristics of the cohort by ABO blood group.
| Variable | levels | O | A | AB | B | p value |
|---|---|---|---|---|---|---|
| N (%) | 41905 (48.1) | 37209 (42.7) | 2234 (2.6) | 5742 (6.6) | ||
| Age, mean (SD) | 58.9 (18.8) | 59.4 (18.7) | 58.5 (18.4) | 58.1 (18.5) | <0.001 | |
| Age group | 0−19 years | 207 (0.5) | 172 (0.5) | 12 (0.5) | 32 (0.6) | <0.001 |
| 20−39 years | 6778 (16.2) | 5696 (15.3) | 361 (16.2) | 953 (16.6) | ||
| 40−59 years | 14390 (34.3) | 12739 (34.2) | 800 (35.8) | 2060 (35.9) | ||
| 60−79 years | 13702 (32.7) | 12426 (33.4) | 718 (32.1) | 1869 (32.5) | ||
| ≥80 years | 6828 (16.3) | 6176 (16.6) | 343 (15.4) | 828 (14.4) | ||
| Gender, n (%) | Male | 21415 (51.1) | 19218 (51.6) | 1102 (49.3) | 2844 (49.5) | 0.005 |
| Female | 20490 (48.9) | 17991 (48.4) | 1132 (50.7) | 2898 (50.5) | ||
| Nursing home, n (%) | No | 40808 (97.4) | 36282 (97.5) | 2188 (97.9) | 5598 (97.5) | 0.322 |
| Yes | 1097 (2.6) | 927 (2.5) | 46 (2.1) | 144 (2.5) | ||
| Immigrant, n (%) | No | 38802 (92.6) | 35411 (95.2) | 2017 (90.3) | 5029 (87.6) | <0.001 |
| Yes | 3103 (7.4) | 1798 (4.8) | 217 (9.7) | 713 (12.4) | ||
| Dependency, n (%) | No | 39401 (94.0) | 34916 (93.8) | 2097 (93.9) | 5433 (94.6) | 0.129 |
| Yes | 2504 (6.0) | 2293 (6.2) | 137 (6.1) | 309 (5.4) | ||
| Convivial unit | Mean(SD) | 3.0 (1.7) | 3.0 (1.6) | 3.0 (1.6) | 3.1 (1.7) | <0.001 |
| Dementia, n (%) | No | 40775 (97.3) | 36170 (97.2) | 2167 (97.0) | 5595 (97.4) | 0.586 |
| Yes | 1130 (2.7) | 1039 (2.8) | 67 (3.0) | 147 (2.6) | ||
| Diabetes, n (%) | No | 36523 (87.2) | 32037 (86.1) | 1920 (85.9) | 4931 (85.9) | <0.001 |
| Yes | 5382 (12.8) | 5172 (13.9) | 314 (14.1) | 811 (14.1) | ||
| Autoimmune Disease, n (%) |
No | 39318 (93.8) | 34844 (93.6) | 2094 (93.7) | 5388 (93.8) | 0.753 |
| Yes | 2587 (6.2) | 2365 (6.4) | 140 (6.3) | 354 (6.2) | ||
| CHD, n (%) | No | 34862 (83.2) | 30520 (82.0) | 1874 (83.9) | 4809 (83.8) | <0.001 |
| Yes | 7043 (16.8) | 6689 (18.0) | 360 (16.1) | 933 (16.2) | ||
| CKD, n (%) | No | 37996 (90.7) | 33582 (90.3) | 2033 (91.0) | 5200 (90.6) | 0.190 |
| Yes | 3909 (9.3) | 3627 (9.7) | 201 (9.0) | 542 (9.4) | ||
| COPD, n (%) | No | 40150 (95.8) | 35476 (95.3) | 2124 (95.1) | 5486 (95.5) | 0.009 |
| Yes | 1755 (4.2) | 1733 (4.7) | 110 (4.9) | 256 (4.5) | ||
| Hyperlipemia, n (%) | No | 25375 (60.6) | 21211 (57.0) | 1336 (59.8) | 3426 (59.7) | <0.001 |
| Yes | 16530 (39.4) | 15998 (43.0) | 898 (40.2) | 2316 (40.3) | ||
| HTA, n (%) | No | 28118 (67.1) | 24875 (66.9) | 1511 (67.6) | 3887 (67.7) | 0.546 |
| Yes | 13787 (32.9) | 12334 (33.1) | 723 (32.4) | 1855 (32.3) | ||
| Stroke, n (%) | No | 39698 (94.7) | 35146 (94.5) | 2116 (94.7) | 5461 (95.1) | 0.127 |
| Yes | 2207 (5.3) | 2063 (5.5) | 118 (5.3) | 281 (4.9) | ||
| Obesity, n (%) | No | 33081 (78.9) | 29233 (78.6) | 1734 (77.6) | 4442 (77.4) | 0.024 |
| Yes | 8824 (21.1) | 7976 (21.4) | 500 (22.4) | 1300 (22.6) | ||
| Flu vaccination in 2019, n (%) | No | 26197 (62.5) | 22913 (61.6) | 1402 (62.8) | 3653 (63.6) | 0.004 |
| Yes | 15708 (37.5) | 14296 (38.4) | 832 (37.2) | 2089 (36.4) |
CHD: Coronary heart disease. CKD: Chronic kidney disease; COPD: Chronic obstrucive pulmonary disease; HTA: Hypertension.