Table 1.
General characteristics of included studies.
| Author | Year | Mortality time | Design | Age group | Country | Race | Survivor | Nonsurvivor | NOS | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| N | NLR | N | NLR | ||||||||
| Biyikli | 2017 | 30 days | R | Adults | Turkey | White | 72 | 207.60 ± 189.63 | 59 | 168.31 ± 209.83 | 8 |
| Djordjevic | 2018 | In-hospital | P | Adults | Serbia | White | 57 | 226.95 ± 145.00 | 26 | 260.57 ± 165.64 | 8 |
| Orak | 2018 | NA | R | Adults | Turkey | White | 111 | 240.97 ± 171.54 | 219 | 364.05 ± 452.56 | 7 |
| Kim | 2019 | One month | P | Adults | Korea | East Asian | 114 | 331.77 ± 268.07 | 44 | 202.70 ± 253.63 | 9 |
| Chen | 2020 | 28 days | P | Adults | China | East Asian | 26 | 115.00 ± 14.00 | 41 | 208.00 ± 20.00 | 9 |
| Liberski | 2020 | ICU | R | Adults | Poland | White | 21 | 354.96 ± 261.16 | 40 | 298.76 ± 300.03 | 8 |
| Zhao | 2020 | 28 days | P | Adults | China | East Asian | 30 | 152.84 ± 87.13 | 10 | 238.64 ± 135.25 | 9 |
| Cakir | 2021 | NA | R | Adults | Turkey | White | 182 | 178.74 ± 202.99 | 229 | 251.84 ± 331.59 | 7 |
| Fateminayyeri | 2021 | In-hospital | P | Adults | Iran | White | 130 | 349.00 ± 617.00 | 130 | 376.00 ± 617.00 | 8 |
| Kurniawan | 2021 | NA | P | Children | Indonesia | East Asian | 50 | 77.54 ± 50.08 | 37 | 157.13 ± 67.38 | 7 |
| Pasaribu | 2021 | 28 days | P | Adults | Indonesia | East Asian | 18 | 148.54 ± 50.08 | 22 | 296.09 ± 299.79 | 9 |
| Rampengan | 2021 | NA | R | Children | Indonesia | East Asian | 37 | 77.54 ± 50.08 | 50 | 157.13 ± 67.38 | 7 |
| Saleh | 2021 | 28 days | R | Adults | Saudi Arabia | White | 107 | 225.31 ± 154.33 | 98 | 230.81 ± 301.35 | 9 |
| Sinha | 2021 | 28 days | P | Adults | India | White | 58 | 22.54 ± 20.42 | 71 | 36.60 ± 49.58 | 9 |
| Tian | 2021 | In-hospital | R | Adults | China | East Asian | 162 | 185.76 ± 105.31 | 32 | 354.63 ± 355.52 | 8 |
| Zhou | 2021 | NA | P | Adults | China | East Asian | 74 | 83.72 ± 10.33 | 46 | 114.65 ± 15.26 | 7 |
NA: not applicable; R: retrospective; P: prospective; NLR: neutrophil to lymphocyte ratio; N: number; ICU: intensive care unit.