Table 2.
Demographics of the included studies.
| Study | Year | Research type | Country | Number of patients n |
Age median, y |
Male n (%) |
Current Smoking n (%) |
||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Critical/Mortal | Non-critical | Critical/Mortal | Non-critical | Critical/Mortal | Non-critical | Critical/Mortal | Non-critical | ||||
| Guan WJ et al. 5 | 2020 | Retrospective study | China | 67 | 1032 | 63 | 46 | 45(67.2%) | 592(57.5%) | 17(25.4%) | 120(11.7%) |
| Huang C et al.6 | 2020 | Retrospective study | China | 13 | 28 | 49 | 49 | 11(84.6%) | 19(67.9%) | 0 | 3(10.7%) |
| Mo P et al.7 | 2020 | Retrospective study | China | 85 | 70 | 61 | 46 | 55(64.7%) | 31(44.3%) | 4(4.7%) | 2(2.9%) |
| Peng YD et al.8 | 2020 | Retrospective study | China | 16 | 96 | 57.5 | 62 | 9(56.3%) | 44(45.8%) | — | — |
| Shi Y et al.9 | 2020 | Retrospective study | China | 49 | 438 | 56 | 45 | 36(73.5%) | 223(50.9%) | 6(12.2%) | 34(7.8%) |
| Tang N et al.10 | 2020 | Retrospective study | China | 21 | 162 | 64 | 52.4 | 16(76.2%) | 82(50.6%) | — | — |
| Tian S et al.11 | 2020 | Retrospective study | China | 46 | 216 | 61.4 | 44.5 | 26(56.5%) | 101(46.8%) | — | — |
| Wang D et al.12 | 2020 | Retrospective study | China | 36 | 102 | 66 | 51 | 22(61.1%) | 53(52.0%) | — | — |
| Wang Z et al.13 | 2020 | Retrospective study | China | 14 | 55 | 70.5 | 37.0 | 7(50.0%) | 25(45.5%) | — | — |
| Wu C et al.14 | 2020 | Retrospective study | China | 84 | 117 | 58.5 | 48 | 60(71.4%) | 68(58.1%) | — | — |
| Yang X et al.15 | 2020 | Retrospective study | China | 32 | 20 | 64.6 | 51.9 | 21(65.6%) | 14(70.0%) | — | — |
| Yuan ML et al.16 | 2020 | Retrospective study | China | 10 | 17 | 68 | 55 | 4(40.0%) | 8(47.1%) | — | — |
| Zhou F et al.17 | 2020 | Retrospective study | China | 54 | 147 | 69 | 52 | 38(70.4%) | 81(55.1%) | 5(9.3%) | 6(4.1%) |