Table 1.
Distribution of the demographic characteristics of the 3099 children who included in the study in the four different study periods: 1st: 05/2020–08/2020, 2nd: 09/2020–12/2020, 3rd: 01/2021–04/2021, 4th: 05/2021–08/2021
| Study period | |||||||
|---|---|---|---|---|---|---|---|
| Total | 1st | 2nd | 3rd | 4th | |||
| Variable | Categories | n (%) | n (%) | n (%) | n (%) | n (%) | p value |
| Children tested | 3099 | 793 (25.6) | 775 (25) | 775 (25) | 756 (24.4) | 0.75 | |
| Seropositive | 344 (11.1) | 11 (1.4) | 67 (8.6) | 133 (17.2) | 133 (17.6) | <0.001 | |
| Gender | Female | 139/1387 (10.0) | 5/364 (1.4) | 31/351 (8.8) | 57/357 (16) | 46/315 (14.6) | <0.001 |
| Male | 205/1712 (12.0) | 6/429 (1.4) | 36/424 (8.5) | 76/418 (18.2) | 87/441 (19.7) | <0.001 | |
| p value | 0.09 | >0.999 | 0.898 | 0.445 | 0.08 | ||
| Age group (years) | 0–1 | 112/837 (13.4) | 5/213 (2.4) | 23/211 (10.9) | 52/253 (20.6) | 32/160 (20.0) | <0.001 |
| 1–4 | 73/642 (11.4) | 1/145 (0.7) | 11/151 (7.3) | 25/156 (16.0) | 36/190 (19.0) | <0.001 | |
| 4–6 | 37/237 (15.6) | 5/66 (7.6) | 7/51 (13.7) | 14/67 (20.9) | 11/53 (20.8) | 0.119 | |
| 6–12 | 70/882 (8.0) | 0/240 (0.0) | 13/234 (5.6) | 24/179 (13.4) | 33/229 (14.4) | <0.001 | |
| 12–16 | 52/501 (10.4) | 0/129 (0.0) | 13/128 (10.2) | 18/120 (15.0) | 21/124 (16.9) | 0.001 | |
| p value | 0.001 | <0.001 | 0.115 | 0.285 | 0.577 | ||
| Department | Hospitalized | 274/2221 (12.3) | 7/541 (1.3) | 59/540 (10.9) | 120/622 (19.3) | 88/533 (17.0) | <0.001 |
| Non‐hospitalized | 70/878 (8.0) | 4/252 (1.6) | 8/235 (3.4) | 13/153 (8.5) | 45/238 (19.0) | <0.001 | |
| p value | <0.001 | 0.75 | <0.001 | 0.001 | 0.411 | ||
| Origin | Greek | 209/2260 (9.3) | 6/580 (1.0) | 32/553 (5.8) | 95/594 (16.0) | 76/533 (14.3) | <0.001 |
| Non‐Greek | 135/839 (16.1) | 5/213 (2.4) | 35/222 (15. 8) | 38/181 (21.0) | 57/223 (25.6) | <0.001 | |
| p value | <0.001 | 0.176 | <0.001 | 0.143 | <0.001 | ||
Note: Among them, 344 (11.1%) were detected seropositive for SARS‐CoV‐2.