Table 1. Baseline characteristics of participants in study comparing complications of COVID-19 and influenza, South Korea*.
| Characteristic | General population† | COVID-19 | Influenza | p value‡ |
|---|---|---|---|---|
| Total no. participants |
52,870,968 |
21,615 |
2,380,696 |
|
| Sex | 0.14 | |||
| M | 26,455,169 (50.0) | 9,700 (44.9) | 1,080,288 (45.4) | |
| F |
26,415,799 (50.0) |
11,915 (55.1) |
1,300,408 (54.6) |
|
| Age, y | <0.001 | |||
| 0–19 | 8,822,808 (16.7) | 1,467 (6.8) | 1,180,279 (49.6) | |
| 20–44 | 18,223,124 (34.5) | 7,665 (35.5) | 531,254 (22.3) | |
| 45–64 | 17,344,828 (32.8) | 7,841 (36.3) | 462,183 (19.4) | |
| 65–74 | 4,907,575 (9.3) | 2,755 (12.8) | 11,5673 (4.9) | |
| ≥75 |
3,572,633 (6.8) |
1,887 (8.7) |
9,1307 (3.8) |
|
| Type of insurance | <0.001 | |||
| Health insurance | 51,344,938 (97.1) | 20,218 (93.5) | 2,327,645 (97.8) | |
| Medical aid |
1,526,030 (2.9) |
1,397 (6.5) |
53,051 (2.2) |
|
| Region | <0.001 | |||
| Seoul metropolitan area | 26,724,640 (50.5) | 12,386 (57.3) | 1,070,695 (45.0) | |
| Daegu and Gyeongsangbuk province | 5,111,575 (9.7) | 4,963 (23.0) | 256,833 (10.8) | |
| Other areas |
21,034,753 (39.8) |
4,266 (19.7) |
1,053,168 (44.2) |
|
| Charlson Comorbidity Index score | <0.001 | |||
| 0 | NA | 13,467 (62.3) | 1,533,247 (64.4) | |
| 1–2 | NA | 6,484 (30.0) | 755,602 (31.7) | |
| >3 |
NA |
1,664 (7.7) |
91,847 (3.9) |
|
| Severity | NA | <0.001 | ||
| Ambulatory state | NA | 5,224 (24.2) | 2,151,801 (90.4) | |
| Hospitalized mild disease | NA | 15,447 (71.5) | 222,572 (9.4) | |
| Hospitalized severe disease | NA | 944 (4.4) | 6,323 (0.3) |
*Values are no. (%) patients except as indicated. COVID-19, coronavirus disease; NA, not applicable. †Data source: 2020 National health insurance statistics. ‡χ2 tests were performed to assess the difference in proportion between COVID-19 and influenza patients.