Table 2.
Descriptive characteristics of the study population split by vaccination status. Infections among unvaccinated individuals were compared with those among individuals who received at least 2 doses of BNT162b2 (Pfizer-BioNTech) and did not have any prior infections before vaccination.
| Characteristics | Unvaccinated individuals (n=1768) | Vaccinated individuals (2 doses of BNT162b2; n=3463) | ||||
| Age (y), mean (SD) | 38.9 (13.3) | 37.3 (15.0) | ||||
| Gender, n (%) | ||||||
|
|
Woman | 1231 (69.63) | 2531 (73.1) | |||
|
|
Man | 514 (29.07) | 921 (26.6) | |||
|
|
Nonbinary | 6 (0.34) | 10 (0.28) | |||
| Residency, n (%) | ||||||
|
|
Germany | 1520 (85.97) | 3252 (93.9) | |||
|
|
Abroad | 248 (14.03) | 212 (6.12) | |||
|
|
|
Austria | 162 (9.16) | 148 (4.27) | ||
|
|
|
Switzerland | 36 (2.03) | 23 (0.66) | ||
|
|
|
Other | 50 (2.83 | 41 (1.18) | ||
| Any chronic disease, n (%) | ||||||
|
|
Allergies | 418 (23.64) | 959 (27.69) | |||
|
|
Others | 348 (19.68) | 721 (20.82 | |||
| Immune deficiency, n (%) | 118 (6.67) | 206 (5.95) | ||||
| Active smoker, n (%) | 417 (23.59) | 519 (14.99) | ||||
| Health care worker, n (%) | 388 (21.95) | 1428 (41.24) | ||||
| BMI (kg/m2), mean (SD) | 25.4 (6.3) | 25 (5.5) | ||||
| Infectionsa, n (%) | 637 (36.03) | 992 (28.65)b | ||||
| Symptomatic infections, n (%) | 318 (17.99)c | 734 (21.2) | ||||
| Test reports per person, mean (SD) | 5.0 (13.0) | 5.3 (10.6)d | ||||
aInfections after vaccination for vaccinated individuals and infections over the study period for unvaccinated individuals.
bChi-square test, P<.001.
cChi-square test, P=.02.
dMann-Whitney U test, P<.001.