Table 1 Characteristics of COVID-19 confirmed cases by period regarding vaccination and circulating variants of SARS-CoV-2
Class | Total | Pre-vaccination | After-vaccination | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Pre- delta dominant | Delta dominant | Omicron dominant | ||||||||
Total | 18,286,735 | (100.0) | 94,179 | (100.0) | 72,518 | (100.0) | 493,557 | (100.0) | 17,626,481 | (100.0) |
Sex | ||||||||||
 Male | 8,597,627 | (47.0) | 46,617 | (49.5) | 37,622 | (51.9) | 258,770 | (52.4) | 8,254,618 | (46.8) |
 Female | 9,689,108 | (53.0) | 47,562 | (50.5) | 34,896 | (48.1) | 234,787 | (47.6) | 9,371,863 | (53.2) |
Age (years) | ||||||||||
 Mean ± SD | 37.3 ± 21.7 | 45.7 ± 20.6 | 41.5 ± 19.2 | 40.2 ± 21.7 | 37.1 ± 21.7 | |||||
  0–9 | 2,184,409 | (11.9) | 3,894 | (4.1) | 3,712 | (5.1) | 45,512 | (9.2) | 2,131,291 | (12.1) |
  10–19 | 2,390,072 | (13.1) | 6,398 | (6.8) | 5,941 | (8.2) | 54,157 | (11.0) | 2,323,576 | (13.2) |
  20–29 | 2,667,693 | (14.6) | 14,191 | (15.1) | 12,362 | (17.0) | 71,844 | (14.6) | 2,569,296 | (14.6) |
  30–39 | 2,691,201 | (14.7) | 12,453 | (13.2) | 11,297 | (15.6) | 72,573 | (14.7) | 2,594,878 | (14.7) |
  40–49 | 2,823,960 | (15.4) | 13,572 | (14.4) | 12,467 | (17.2) | 70,814 | (14.3) | 2,727,107 | (15.5) |
  50–59 | 2,261,051 | (12.4) | 17,431 | (18.5) | 12,930 | (17.8) | 65,012 | (13.2) | 2,165,678 | (12.3) |
  60–69 | 1,855,102 | (10.1) | 14,642 | (15.5) | 8,979 | (12.4) | 69,436 | (14.1) | 1,762,045 | (10.0) |
  70–79 | 879,645 | (4.8) | 7,084 | (7.5) | 3,380 | (4.7) | 29,042 | (5.9) | 840,139 | (4.8) |
   ≥ 80 | 533,602 | (2.9) | 4,514 | (4.8) | 1,450 | (2.0) | 15,167 | (3.1) | 512,471 | (2.9) |
Vaccination | ||||||||||
 None | 4,124,629 | (22.6) | 94,178 | (100.0) | 70,160 | (96.7) | 246,166 | (49.9) | 3,714,125 | (21.1) |
 Partial | 209,788 | (1.1) | 1 | (0.0)* | 1,990 | (2.7) | 39,389 | (8.0) | 168,408 | (1.0) |
 Complete | 5,441,223 | (29.8) | 0 | (0.0) | 368 | (0.5) | 201,809 | (40.9) | 5,239,046 | (29.7) |
 Booster | 8,511,095 | (46.5) | 0 | (0.0) | 0 | (0.0) | 6,193 | (1.3) | 8,504,902 | (48.3) |
Outcome | ||||||||||
 Severe/criticala) | 23,258 | (0.1) | 2,774 | (2.9) | 1447 | (2.0) | 8525 | (1.7) | 10,512 | (0.1) |
  Average per day | 26.4 | 6.9 | 12.0 | 46.8 | 60.4 | |||||
  Mean age (years± SD) | 69.3 ± 15.5 | 71.1 ± 12.2 | 65.1 ± 14.1 | 65.4 ± 15.4 | 72.6 ± 15.7 | |||||
   ≥ 60 | 18,170 | (78.1) | 2,354 | (84.9) | 987 | (68.2) | 5,898 | (69.2) | 8,931 | (85.0) |
   ≥ 80 | 6,560 | (28.2) | 703 | (25.3) | 225 | (15.5) | 1,583 | (18.6) | 4,049 | (38.5) |
Death | 24,611 | (0.1) | 1,749 | (1.9) | 348 | (0.5) | 4,672 | (0.9) | 17,842 | (0.1) |
 Average per day | 27.9 | 4.3 | 2.9 | 25.7 | 102.5 | |||||
  Mean age (years± SD) | 79.6 ± 12.1 | 79.3 ± 10.6 | 76.7 ± 12.1 | 77.0 ± 12.3 | 80.3 ± 12.1 | |||||
   ≥ 60 | 23,063 | (93.7) | 1,665 | (95.2) | 318 | (91.4) | 4,303 | (92.1) | 16,777 | (94.0) |
   ≥ 80 | 14,492 | (58.9) | 964 | (55.1) | 159 | (45.7) | 2,226 | (47.6) | 11,143 | (62.5) |