Table 1.
Baseline characteristics
| Characteristics | Korean population (n = 51 349 116) | Vaccinated population (n = 44 276 704) | VRM (n = 480) |
|---|---|---|---|
| Median age (years), median (IQR) | 45 (27–60) | 47 (32–61) | 30 (20–45) |
| Age group (years), n (%) | |||
| < 12 | 4 441 020 (9) | ||
| 12–17 | 2 768 836 (5) | 2 076 259 (5) | 78 (16) |
| 18–29 | 7 619 756 (15) | 7 415 068 (17) | 161 (34) |
| 30–39 | 6 686 639 (13) | 6 313 754 (14) | 86 (18) |
| 40–49 | 8 109 221 (16) | 7 706 804 (17) | 63 (13) |
| 50–59 | 8 570 076 (17) | 8 361 166 (19) | 55 (12) |
| 60–69 | 7 140 703 (14) | 6 913 088 (16) | 23 (5) |
| ≥ 70 | 6 012 865 (11) | 5 490 565 (12) | 14 (3) |
| Sex, n (%) | |||
| Female | 25 746 790 (50) | 22 118 827 (50) | 181 (38) |
| Male | 25 602 326 (50) | 22 157 877 (50) | 299 (62) |
| Symptoms or signs, n (%) | |||
| Chest pain or discomfort | 287 (60) | ||
| Dyspnea | 128 (27) | ||
| Fever | 76 (16) | ||
| Palpitation | 60 (13) | ||
| Vital signs, mean (SD) | |||
| Systolic BP (mmHg) | 121. 2 (25.3) | ||
| Diastolic BP (mmHg) | 74. 4 (17.1) | ||
| Heart rate (b.p.m.) | 86.4 (22.1) | ||
| Body temperature (°C) | 36. 9 (0.8) | ||
| Coexisting illness, n (%) | |||
| Diabetes mellitus | 6 (2) | ||
| Hypertension | 26 (8) | ||
| Dyslipidemia | 10 (3) | ||
| CAD | 2 (1) | ||
| CVA | 1 (0) | ||
| Type of vaccine, n (%) | |||
| BNT162b2 | 24 828 152 (56) | 306 (64) | |
| mRNA-1273 | 6 781 796 (15) | 156 (33) | |
| ChAdOx1 | 11 156 646 (25) | 15 (3) | |
| Ad26 | 1 510 110 (3) | 3 (1) |
The population of Korea is from Korean Statistical Information Service (http://kosis.kr/eng/).
VRM, vaccine-related myocarditis; BP, blood pressure; CAD, coronary artery disease; CVA, cerebrovascular accident; SD, standard deviation; IQR, interquartile range.