Risk variables | Unvaccinated | Vaccinated | P value | |||
---|---|---|---|---|---|---|
Category | n | % | n | % | ||
Number of patients, n (%) | Controls | 6307 | 70.7 | 938 | 77.1 | < 0.0001 |
Cases | 2616 | 29.3 | 279 | 22.9 | ||
Age (y) | Median (range) | 11.4 (0–105.3) | 76.5 (0.6–102.8) | < 0.0001 | ||
Age group, n (%) (2) | 0–5 months | 1254 | 14.3% | 0 | 0.0% | < 0.0001 |
6–11 months | 643 | 7.3% | 13 | 1.1% | ||
1–4 yrs | 1948 | 22.2% | 51 | 4.3% | ||
5–17 yrs | 760 | 8.7% | 67 | 5.6% | ||
18–49 yrs | 1988 | 22.7% | 112 | 9.4% | ||
50–64 yrs | 628 | 7.2% | 106 | 8.9% | ||
65–74 yrs | 583 | 6.6% | 210 | 17.6% | ||
75–84 yrs | 566 | 6.5% | 337 | 28.2% | ||
≥85 y | 403 | 4.6% | 299 | 25.0% | ||
Sex, n (%) | Male | 4462 | 50.0% | 643 | 52.8% | 0.0641 |
Female | 4461 | 50.0% | 574 | 47.2% | ||
Comorbidities, n (%) | None | 6123 | 68.6% | 303 | 24.9% | < 0.0001 |
1 | 1457 | 16.3% | 355 | 29.2% | ||
> 1 | 1343 | 15.1% | 559 | 45.9% | ||
Pregnant, n (%) | – | 921 | 69.5% | 19 | 40.4% | < 0.0001 |
Obesity, n (%) | – | 1148 | 13.8% | 309 | 26.7% | < 0.0001 |
Previous hospitalisation within 12 months, n (%) | – | 1914 | 24.1% | 406 | 37.7% | < 0.0001 |
GP visit within 3 months, n (%) | None | 3074 | 38.8% | 209 | 19.4% | < 0.0001 |
1 | 1740 | 21.9% | 188 | 17.4% | ||
> 1 | 3116 | 39.3% | 681 | 63.2% | ||
Smoking, n (%) | Current | 2112 | 24.1% | 158 | 13.0% | < 0.0001 |
Past | 1618 | 18.5% | 388 | 32.0% | ||
Never | 5037 | 57.5% | 667 | 55.0% | ||
Functional impairment in ≥65 y, n (%) | None or minimal | 72 | 5.4% | 58 | 7.0% | 0.4086 |
Mild | 32 | 2.4% | 18 | 2.2% | ||
Moderate | 52 | 3.9% | 41 | 4.9% | ||
Severe | 309 | 23.1% | 191 | 23.0% | ||
Total | 871 | 65.2% | 523 | 62.9% | ||
Sampling interval (days) | Median (range) | 3 (0–9) | 4 (0–9) | < 0.0001 | ||
Sampling interval, n (%) | ≤4 days | 6377 | 72.1% | 781 | 64.2% | < 0.0001 |
5–7 days | 2148 | 24.3% | 357 | 29.3% | ||
8–9 days | 315 | 3.6% | 79 | 6.5% | ||
Site, n (%) | St. Pet | 1851 | 20.7% | 86 | 7.1% | < 0.0001 |
Moscow | 1555 | 17.4% | 65 | 5.3% | ||
Kazakhstan | 159 | 1.8% | 0 | 0.0% | ||
Czech Republic | 105 | 1.2% | 6 | 0.5% | ||
Canada | 993 | 11.1% | 139 | 11.4% | ||
Romania | 380 | 4.3% | 7 | 0.6% | ||
Turkey | 392 | 4.4% | 21 | 1.7% | ||
Valencia | 1300 | 14.6% | 825 | 67.8% | ||
Tunisia | 37 | 0.4% | 2 | 0.2% | ||
Suzhou/Shanghai | 469 | 5.3% | 1 | 0.1% | ||
India | 482 | 5.4% | 11 | 0.9% | ||
Mexico | 301 | 3.4% | 49 | 4.0% | ||
South Africa | 899 | 10.1% | 5 | 0.4% | ||
Vaccinated, n (%) | In 2015–2016 | 718 | 8.0% | 949 | 78.0% | < 0.0001 |
In 2014–2015 | 589 | 6.6% | 818 | 67.2% | < 0.0001 |