Table 2.
Subgroup analysis of pooled prevalence (PP) of at least one symptom among asymptomatic SARS-CoV-2 infection cases by age group, sample size, country, follow-up time, and epidemic period.
| Subgroups | Data Source | Patients n/N |
PP(%) | 95%CI(%) | p-Value | I2(%) | p-Heterogeneity | |
|---|---|---|---|---|---|---|---|---|
| Age group | Adults | 1, 2, 4, 5 | 20/99 | 21.38 | −11.12–53.87 | >0.05 | 94.30 | <0.05 |
| Children | 56/444 | 15.20 | 5.25–25.15 | <0.05 | 64.20 | >0.05 | ||
| Sample size | <100 | 1, 2, 4, 5 | 30/144 | 21.27 | 1.71–40.83 | <0.05 | 90.20 | <0.05 |
| ≥100 | 46/399 | 11.53 | 8.40–14.66 | <0.05 | - | - | ||
| Country | Italy | 1, 2, 4, 5 | 49/454 | 9.05 | 3.20–14.90 | <0.05 | 67.70 | >0.05 |
| Germany | 10/45 | 22.22 | 10.08–34.37 | <0.05 | - | - | ||
| Luxembourg | 17/44 | 38.64 | 24.25–53.02 | <0.05 | - | - | ||
| Follow-up time | <12 months | 1, 2, 4, 5 | 59/499 | 11.35 | 4.76–17.95 | <0.05 | 69.90 | <0.05 |
| ≥12 months | 17/44 | 38.64 | 24.25–53.02 | <0.05 | - | - | ||
| Epidemic period | non-VOCs period | 1, 2, 4, 5 | 56/444 | 15.20 | 5.25–25.15 | <0.05 | 64.20 | >0.05 |
| VOCs period | 20/99 | 21.38 | −11.12–53.87 | >0.05 | 94.30 | <0.05 | ||
| Overall | 1, 2, 4, 5 | 76/543 | 17.13 | 7.55–26.71 | <0.05 | 85.40 | <0.05 | |