Characteristics of included studies
| Study and country | Sample size | Study type | Mean age | Age range | Severity of Covid-19 | Method of diagnosis |
| Ji et al and China16 | 2 (0 female) | Case series | 12 years | 9–15 years | Mild (n=2) | RT-PCR |
| Liu et al and China18 | 5 (1 female) | Case series | 5.9 years | 7 months to 13 years | Asymptomatic (n=1), mild (n=1), moderate (n=3) | RT-PCR |
| Lu et al and China20 | 171 (67 female) | Case series | 6.7 | 1 day to 15 years | Asymptomatic (n=27), mild (n=33), moderate (n=108), severe (n=3) | RT-PCR |
| Qiu et al and China22 | 36 (13 female) | Case series | 8.3 | 1–16 | Mild (n=17), moderate (n=19) | RT-PCR |
| Sun et al and China23 | 8 (2 female) | Case series | Not stated | 2 months to 15 years | Severe (n=8) | RT-PCR |
| Xia et al and China24 | 20 (7 female) | Case series | 2.1 years | 1 day to 14.7 years | Moderate (n=20) | Nucleic acid test |
| Zhang et al and China25 | 3 (0 female) | Case series | 7.7 years | 6–9 years | Mild (n=1), moderate (n=2) | RT-PCR |
| Zheng et al and China26 | 25 (11 female) | Case series | 3 years (median) | 3 months to 14 years | Mild (n=8), moderate (n=15), severe (n=2) | RT-PCR |
| Cui et al and China15 | 1 (1 female) | Case report | 55 days | N/A | Moderate (n=1) | RT-PCR |
| Kam et al and Singapore17 | 1 (0 female) | Case report | 6 months | N/A | Mild (n=1) | RT-PCR |
| Liu et al and China19 | 1 (0 female) | Case report | 10 years | N/A | Mild (n=1) | RT-PCR |
| Park et al and Korea21 | 1 (1 female) | Case report | 10 years | N/A | Moderate (n=1) | RT-PCR |
| Cai et al and China14 | 10 (6 female) | Case series | 6 years | 3–131 months | Mild (n=6), moderate (n=4) | RT-PCR |
RT, reverse transcription.