| 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 |