Table 1.
Basic characteristics of the children participating in the study in Tehran from autumn 2020 to spring 2021 (n = 1517) *.
| Variables | Categories | n (%) |
|---|---|---|
| Age groups (years old) | 0–4 | 906 (59.72) |
| 5–9 | 417 (27.49) | |
| 10–14 | 194 (12.79) | |
| Gender | Female | 483 (31.84) |
| Male | 1034 (68.16) | |
| Season | Autumn 2020 | 356 (23.47) |
| Winter 2020 | 551 (36.32) | |
| Spring 2021 | 610 (40.21) | |
| Smoking (parents) | No | 1248 (82.27) |
| Yes | 269 (17.73) | |
| Socioeconomic status | Medium and high | 867 (57.15) |
| Low | 650 (42.85) | |
| Household size | 2–3 | 600 (39.55 |
| 4 | 658 (43.38) | |
| >4 | 259 (17.07) | |
| Symptomatic | Asymptomatic | 975 (64.27) |
| Common symptoms 1 | 269 (17.70) | |
| Cardinal Symptoms 2 | 273 (18) | |
| Contact with suspected or confirmed cases during 4 last weeks | Yes | 202 (13.3) |
| No | 1206 (79.5) | |
| Unknown | 109 (7.2) |
* The table was generated based on imputed data. 1 Common symptoms: at least one of the followings symptoms reported: sore throat, fatigue, rhinorrhea, stomachache, headache, nausea/vomiting, wheeze, dyspnea, myalgia, chest pain, and change in smell or taste. 2 Cardinal symptoms: fever (>38 °C) and/or cough and/or diarrhea.