Table 1.
Characteristics of included studies.
| Study | Sample size | Design | Severe patients |
Non-severe patients |
||
|---|---|---|---|---|---|---|
| n (%) | Age (years) | n (%) | Age (years) | |||
| Zhang J et al. [2] 2020 | 140 | Retrospective cohort | 58 (41.4%) | 64 (25–87) | 82 (58.6%) | 51.5 (26–78) |
| To W et al. [3] 2020 | 23 | Prospective cohort | 10 (43.4%) | 66 (39–75) | 13 (56.6%) | 56 (37–75) |
| Petrilli C et al. [4] 2020 | 5279 | Prospective cohort | 990 (36.2%) | 69.5 (19–75) | 1739 (63.8%) | 59.5 (19–75) |
| Chang M et al. [5] 2020 | 211 | Retrospective cohort | 13 (6.1%) | 54 (42–66) | 198 (93.9%) | 36 (22–50) |
| Zhang C et al. [6] 2020 | 1000 | Prospective cohort | 24 (30%) | 64 (50–79) | 56 (70%) | 45 (30–60) |
| Simonnet A et al. [7] 2020 | 124 | Retrospective cohort | 85 (68.5%) | 60 (51–69) | 39 (31.5%) | 60 (50–72) |
| Chen Q et al. [8] 2020 | 145 | Retrospective cohort | 43 (29.6%) | 52 (37–68) | 102 (70.4%) | 45 (31–58) |