GENERAL CHARACTERISTICS
Negative AB test (N=2670) Positive AB test (N=162)
p
Study participation due to
… regular health check-up, % (N) 66.0 (1763) 32.1 (52)
… COVID-19 symptoms/contacts, % (N) 34.0 (907) 67.9 (110) <.001*
Sex (male), % (N) 51.7 (1380) 50.6 (82) .792
Age (years) (Md, IQR) 7 (4.0-10.0) 8 (4.7-11.0) .070
(range 0-17) (range 0-16)
Any chronic disease, % (N) 12.3 (329) 9.3 (15) .247
Does your child usually attend…
Nursery, % (N) 6.1 (163) 4.9 (8)
Kindergarten, % (N) 27.5 (733) 23.5 (38)
Elementary school, % (N) 30.3 (809) 29.0 (47)
Secondary school (Mittelschule), % (N) 4.9 (130) 9.9 (16)
Secondary school (Realschule), % (N) 8.5 (227) 11.1 (18)
Grammar school, % (N) 11.0 (295) 9.9 (16)
School for special needs, % (N) 0.6 (17) 1.2 (2)
None of them, % (N) 11.1 (296) 10.5 (17) .138
SARS-CoV-2 PCR testing, % (N) 8.8 (234) 17.9 (29) <.001*
Positive SARS-CoV-2 PCR test, % (N) 0.2 (6) 9.3 (15) <.001*
Hospitalization due to COVID-19, % (N) 0.2 (6) 1.2 (2) .019*
Household member COVID-19, % (N) 6.0 (161) 47.5 (77) <.001*
Any symptom, % (N) 70.1 (1871) 76.5 (124) .080