Total absences from attending school in person Absences due to RTI Absences due to other causes OR (95% CI) P value
Characteristic N = 98 N = 71 N = 27
Age group
4-6 years 66 (67.3) 45 (63.4) 21 (77.8) 1 ref
7-9 years 12 (12.2) 11 (15.5) 1 (3.7) 5.13 (0.62,42.38) 0.129
10-11 years 20 (20.4) 15 (21.1) 5 (18.5) 1.4 (0.45,4.36) 0.562
Period
First year (spring) 36 (36.7) 22 (31) 14 (51.9) 1 ref
Second year (autumn) 62 (63.3) 49 (69) 13 (48.1) 2.4 (0.97,5.94) 0.059
Sex
Male 46 (46.9) 34 (47.9) 12 (44.4) 1.15 (0.47,2.8) 0.76
Female 52 (53.1) 37 (52.1) 15 (55.6) 1 ref
Sports
Yes 52 (53.1) 40 (56.3) 12 (44.4) 1.67 (0.68,4.08) 0.263
No 45 (45.9) 30 (42.3) 15 (55.6) 1 ref
Missing 1 (1) 1 (1.4) 0 (0)
Floor level
First floor or lower 54 (55.1) 41 (57.7) 13 (48.1) 1 ref
Upper floors 43 (43.9) 29 (40.8) 14 (51.9) 0.66 (0.27,1.6) 0.356
Missing 1 (1) 1 (1.4) 0 (0)
Number of cohabitants, median (IQR) 4 (4-4) 4 (4-4) 4 (3-4.5) 1.07 (0.8,1.44) 0.653
Number of cohabitants
<4 24 (24.5) 16 (22.5) 8 (29.6) 1 ref
>=4 73 (74.5) 54 (76.1) 19 (70.4) 1.42 (0.52,3.85) 0.49
Missing 1 (1) 1 (1.4) 0 (0)
Smokers at home
Yes 35 (35.7) 25 (35.2) 10 (37) 0.92 (0.37,2.32) 0.866
No 63 (64.3) 46 (64.8) 17 (63) 1 ref
Hospital admissions
Yes 0 (0) 0 (0) 0 (0)
No 98 (100) 71 (100) 27 (100)
Comorbidities
Yes 10 (10.2) 8 (11.3) 2 (7.4) 1.59 (0.31,8) 0.576
No 88 (89.8) 63 (88.7) 25 (92.6) 1 ref
Asthma
Yes 5 (50) 5 (62.5) 0 (0)
No 5 (50) 3 (37.5) 2 (100)
Complete COVID-19 vaccination
Yes 19 (19.4) 12 (16.9) 7 (25.9) 0.58 (0.2,1.68) 0.316
No 79 (80.6) 59 (83.1) 20 (74.1) 1 ref
Complete COVID-19 vaccination at home
Yes 84 (85.7) 63 (88.7) 21 (77.8) 2.5 (0.69,9.04) 0.162
No 11 (11.2) 6 (8.5) 5 (18.5) 1 ref
Missing 3 (3.1) 2 (2.8) 1 (3.7)
Anyone at home with respiratory symptoms
Yes 41 (41.8) 38 (53.5) 3 (11.1) 9.21 (2.54,33.39) 0.001
No 57 (58.2) 33 (46.5) 24 (88.9) 1 ref
Level of CO2, median (IQR) 567.76 (485-637.78) 606.51 (485-876) 485 (479-637.78) 1.2 (0.98,1.46) 0.077
Level of CO2
< 1000 79 (80.6) 54 (76.1) 25 (92.6) 1 ref
>= 1000 19 (19.4) 17 (23.9) 2 (7.4) 3.94 (0.84,18.35) 0.081
Symptoms
Fever (yes) 50 (51.0) 40 (56.3) 10 (37.0) 0.121
Cough (yes) 53 (54.0) 49 (69.0) 7 (25.9) <0.001
Odynophagia (yes) 31 (31.6) 30 (42.3) 1 (3.7) 0.001
Nasal congestion (yes) 60 (61.2) 54 (76.1) 6 (22.2) <0.001
Gastrointestinal symptoms (yes) 30 (30.6) 12 (16.9) 18 (66.7) <0.001