3.2 Chest CT features
The characteristics of chest CT were reported in Table 2. During the hospitalization period, ninety-seven (85%) pediatric patients were performed no more than two chest CTs, while 17 (15%) cases were performed 3 or more CT scans. During all the patients, normal chest CTs were found in 32 (28%) cases, and no more than 2 lobes involved in 63 (55%) cases. Unilateral lung involvement was found in 46 (40%) cases, and bilateral lung involvement was found in 36 (32%) cases. Bilateral inferior lobes were most susceptible to COVID-19, with 43 cases (38%) affected in both the left and right lower lobe, respectively. Ground-glass opacity (46, 40%) and consolidation (46, 40%) were the most common lesion patterns (E-figures 2 and 3 for details), while nodules were found in 7 (6%) cases (E-figure 4 for details). A comparison of chest CT features between cases with and without coinfection was shown in E-table 1.