Table 1.
Demographics and main clinical characteristics of study participants
| Characteristics | Overall (N = 1009) | Symptomatic (n = 493) | Asymptomatic (n = 516) | p-value |
|---|---|---|---|---|
| Age (y), mean (SD) | 3.7 (4.4) | 2.3 (3.1) | 5.0 (5.0) | <0.001 |
| Age category (y), n (%) | <0.001 | |||
| <2 | 551 (54.6) | 328 (66.5) | 223 (43.2) | |
| 2–10 | 323 (32.0) | 142 (28.8) | 181 (35.1) | |
| 11–15 | 116 (11.5) | 22 (4.5) | 94 (18.2) | |
| >15 | 19 (1.9) | 1 (0.2) | 18 (3.5) | |
| Male sex, n (%) | 547 (54.3) | 269 (54.6) | 278 (53.9) | 0.88 |
| Gravity rank at admission, n (%) | 0.40 | |||
| 1 (the most serious health condition) | 19 (1.9) | 9 (1.8) | 10 (1.9) | |
| 2 | 72 (7.1) | 35 (7.1) | 37 (7.2) | |
| 3 | 492 (48.8) | 252 (51.1) | 240 (46.5) | |
| 4 | 392 (38.9) | 185 (37.5) | 207 (40.1) | |
| 5 (the least serious health condition) | 34 (3.4) | 12 (2.4) | 22 (4.3) | |
| Peripheral oxygen saturation at entrance, mean (SD) | 98.3 (3.2) | 97.9 (3.7) | 98.7 (2.4) | <0.001 |
| Temperature at entrance (°C), mean (SD) | 38.1 (15.2) | 37.7 (1.0) | 38.4 (21.3) | 0.41 |
| Hospitalization, n (%) | 764 (75.7) | 279 (56.6) | 485 (94.0) | <0.001 |
| Days since symptom onset, mean (SD) | 2.3 (3.1) | 2.9 (3.5) | 1.52 (2.2) | <0.001 |
|
Contact with confirmed case, n (%) Positive cases, n (% of cases) |
72 (7.1) 25 (34.7) |
58 (11.8) 22 (37.9) |
14 (2.7) 3 (21.4) |
<0.001 |
| Days since exposure, mean (SD) | 6.0 (4.1) | 6.0 (4.1) | 5.9 (4.4) | 0.92 |
| Symptoms, n (%) | ||||
| Fever | 502 (49.8) | 343 (69.7) | 159 (30.8) | <0.001 |
| Nasal discharge | 382 (37.9) | 320 (65.2) | 62 (12) | <0.001 |
| Cough | 355 (35.5) | 314 (64.0) | 41 (7.9) | <0.001 |
| Diarrhoea | 153 (15.2) | 60 (12.2) | 93 (18.0) | 0.01 |
| Comorbidities, n (%) | ||||
| Chronic respiratory disease | 72 (7.2) | 55 (11.2) | 17 (3.3) | <0.001 |
| Cardiopathy | 30 (3.0) | 19 (3.9) | 11 (2.1) | 0.15 |
| Immunodepression | 24 (2.4) | 7 (1.4) | 17 (3.3) | 0.08 |
Symptomatic means the presence of a clinical picture compatible with severe acute respiratory syndrome coronavirus 2 infection, as described in the text. SD, standard deviation.