Research Article
The Effect of Smoking on COVID-19 Symptom Severity: Systematic Review and Meta-Analysis
Table 3
The relationship between history of smoking and the severity of COVID-19.
| Studies | Severe COVID-19 with history of smoking | Nonsevere COVID-19 with history of smoking | Authors | Event | Total | % | Event | Total | % |
| CDC report [4] | 38 | 457 | 8.3 | 208 | 6180 | 3.3 | Chen et al. [10] | 3 | 43 | 7.0 | 12 | 102 | 11.0 | Feng et al. [11] | 17 | 121 | 14.0 | 27 | 333 | 8.1 | Goyal et al. [12] | 6 | 130 | 4.6 | 14 | 263 | 5.3 | Guan et al. [13] | 38 | 172 | 22.0 | 120 | 913 | 13.0 | Liu et al. [14] | 3 | 11 | 27.3 | 2 | 67 | 2.0 | Mo et al. [15] | 4 | 85 | 4.7 | 2 | 70 | 2.9 | Qi et al. [16] | 31 | 50 | 62.0 | 22 | 217 | 10.1 | Shi et al. [17] | 6 | 49 | 12.2 | 34 | 438 | 7.8 | Wang et al. [18] | 7 | 25 | 28.0 | 9 | 100 | 9.0 | Wan et al. [19] | 1 | 40 | 2.5 | 8 | 95 | 8.4 | Yang et al. [20] | 0 | 32 | 0 | 2 | 20 | 10.0 | Yu et al. [21] | 2 | 26 | 8.0 | 24 | 307 | 8.9 | Zhang et al. [22] | 6 | 58 | 10.3 | 3 | 82 | 3.6 | Zhang et al. [23] | 6 | 30 | 20.0 | 0 | 90 | 0 | Zhou et al. [24] | 5 | 54 | 9.0 | 6 | 137 | 4.0 | Total | 173 | 1383 | 12.5 | 493 | 9414 | 5.2 |
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