Table 1 Characteristics of the three study cohorts: no influenza vaccination, influenza vaccination, and vaccination other than influenza.
Characteristics | No influenza vaccination | Percent | Influenza vaccination | Percent | Vaccination other than influenza | Percent |
|---|---|---|---|---|---|---|
N | 42,629,666 | 13,038,311 | 1,783,969 | |||
Age 75 and older | 17,909,748 | 42 | 5,568,818 | 43 | 671,574 | 38 |
Male | 19,042,518 | 45 | 5,636,245 | 43 | 739,562 | 41 |
Risk factors | ||||||
Asthma | 91,734 | 0.22 | 31,753 | 0.24 | 5052 | 0.28 |
Chronic kidney disease with dialysis | 43,809 | 0.10 | 1787 | 0.014 | 888 | 0.050 |
Chronic lung disease | 1,520,026 | 3.6 | 365,723 | 2.8 | 50,698 | 2.8 |
Diabetes mellitus | 4,620,287 | 11 | 1,165,787 | 8.9 | 175,659 | 9.8 |
Hemoglobin disorder | 17,624 | 0.041 | 4285 | 0.033 | 776 | 0.043 |
Immunocompromised | 214,861 | 0.50 | 59,518 | 0.46 | 9384 | 0.53 |
Liver disease | 158,425 | 0.37 | 32,516 | 0.25 | 5973 | 0.33 |
Serious heart condition | 3,528,349 | 8.3 | 891,346 | 6.8 | 122,178 | 6.8 |
Severe obesity | 1,511,601 | 3.5 | 423,755 | 3.3 | 67,534 | 3.8 |
Other vaccination1 | 34,669,841 | 81 | 8,004,874 | 61 | Not applicable | |
Vaccine with adjuvant | Not applicable | 3,740,784 | 29 | Not applicable | ||
Outcome | ||||||
COVID-19 infection | 532,550 | 1.2 | 117,467 | 0.90 | 17,472 | 0.98 |
Severe COVID-19 illness | 8540 | 0.020 | 1302 | 0.010 | 223 | 0.013 |
