Table 2.
Comparison of the severity level in each period according to age
| Severity | Control period (n = 5335) | Exposure period (n = 7423) | P-value |
|---|---|---|---|
| All | |||
| Severity level | < 0.001 | ||
| 1 (severe) | 12 (0.2) | 69 (0.9) | |
| 2 (moderate) | 1531 (28.7) | 4212 (56.7) | |
| 3 (mild) | 3792 (71.1) | 3142 (42.3) | |
| Age < 15 years | |||
| Severity level | < 0.001 | ||
| 1 (severe) | 5 (0.2) | 13 (0.3) | |
| 2 (moderate) | 855 (27.1) | 2297 (55.3) | |
| 3 (mild) | 2287 (72.7) | 1842 (44.4) | |
| Age 15–64 years | |||
| Severity level | < 0.001 | ||
| 1 (severe) | 5 (0.2) | 30 (1.0) | |
| 2 (moderate) | 652 (30.9) | 1821 (59.0) | |
| 3 (mild) | 1495 (68.9) | 1238 (40.1) | |
| Age ≥ 65 years | |||
| Severity level | < 0.001 | ||
| 1 (severe) | 2 (2.7) | 26 (14.3) | |
| 2 (moderate) | 24 (31.6) | 94 (51.7) | |
| 3 (mild) | 50 (65.8) | 62 (34.1) | |