FMB-2021-0285 Supplementary material

Table S1. Pre-existing conditions before COVID-19 infection (multiple choices and free text allowed). Conditions found only in 1 Long-COVID child were grouped into Other<br>Table S2. Symptoms present since COVID-19 infection (multiple choices allowed), by confirmation status of COVID-19 infection.<br>Table S3. Changes reported since COVID infection, by confirmation status of COVID-19 infection, and by the pre-existence of comorbidity conditions<br>Table S4. Number of changes since COVID-19 infection, by confirmation status of infection, and by the pre-existence of comorbidity conditions<br>Table S5. Activity level before infection by Participation in Any level of activity in the first 6 weeks of COVID-19 infection<br>Table S6. Child’s current activity level by Activity level before infection<br>Table S7. Mental health / cognitive issues since COVID-19 infection (multiple issues per child are usual), by confirmation status of infection, and by the pre-existence of comorbidity conditions<br>Table S8. Number of mental health / cognitive issues since COVID-19 infection (from those in Table 5, excluding “None of the above” and “Other”), by confirmation status of infection, and by the pre-existence of comorbidity conditions<br>Supplemental Figure S1. Social media traffic of the Long Covid Kids UK platform.<br>

附表S1：新冠感染前的基础疾病情况（支持多选及自由文本填写）。仅在1名长新冠儿童中检出的疾病将归类为“其他”。<br>附表S2：新冠感染后持续存在的症状（支持多选），按新冠感染确诊情况分组。<br>附表S3：新冠感染后报告的身体状况变化，按新冠感染确诊情况及共病基础疾病的既往存在情况分组。<br>附表S4：新冠感染后报告的身体状况变化数量，按新冠感染确诊情况及共病基础疾病的既往存在情况分组。<br>附表S5：感染前活动水平按新冠感染最初6周内参与任意强度活动的情况进行分组。<br>附表S6：儿童当前活动水平按感染前活动水平分组。<br>附表S7：新冠感染后出现的心理健康/认知问题（每名儿童通常存在多种此类问题），按新冠感染确诊情况及共病基础疾病的既往存在情况分组。<br>附表S8：新冠感染后出现的心理健康/认知问题数量（数据取自附表5，排除“无上述情况”及“其他”选项），按新冠感染确诊情况及共病基础疾病的既往存在情况分组。<br>补充图S1：Long Covid Kids UK平台的社交媒体流量情况。