Table 1 Characteristics of included studies
Study | Year | Country | Design, center | Models | Endpoint | Sample size | NLR cutoff | Age (years) Mean ± SD/median (min–max) | Follow-up |
|---|---|---|---|---|---|---|---|---|---|
Bingol et al. [15] | 2020 | Turkey | Retrospective, single center | Preoperative NLR | 30-day mortality 1-year mortality | 241 | 6.55 | 81.09 ± 8.11 | 12 months |
Özbek et al. [16] | 2020 | Turkey | Retrospective, single center | Preoperative NLR | 1-year mortality | 55 | 5.25 | Nonsurvivors: 83.54 ± 7.3 Survivors: 79.90 ± 7.6 | Maximum follow-up period of 27 months |
Atlas et al. [19] | 2020 | Turkey | Retrospective, single center | Preoperative NLR Postoperative day 5 NLR | 7-day mortality | 132 | Preoperative: 9.635 Postoperative: 21.07 | 80 ± 8.4 | 7 days |
Temiz et al. [17] | 2019 | Turkey | Retrospective case control study, single center | Preoperative NLR | 1-year mortality | 50 | 4.7 | Nonsurvivors: 73.81 (65–80) Survivors: 72.71 (67–80) | > 1 year |
Niessen et al. [18] | 2018 | Belgium | Retrospective cohort study, single-center | Preoperative NLR | Hospital discharge and intra-hospital mortality | 535 | N/A | Survivors: 84 ± 7 Nonsurvivors: 85 ± 9 | N/A |
Altinsoy et al. [27] | 2018 | Turkey | Retrospective, single center | Preoperative NLR Postoperative day 1 NLR | Died in the ICU during the postoperative period | 199 | N/A | Survivors: 80.54 ± 6.942 Nonsurvivors: 85.47 ± 5.423 | N/A |
Sedlář et al. [26] | 2015 | Czech | Retrospective, single center | Preoperative NLR Postoperative NLR | 5-year mortality | 104 | N/A | Mean age: 80 ± 9 years | 48–84 (median: 60) |
Forget et al. [14] | 2015 | Belgium | Retrospective cohort study, single center | Preoperative NLR Postoperative day 5 NLR | Patient’s survival time | 242 | Postoperative day 5: 5 | Median age: 85 years (66–102) | 21 |