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Table 3 Performance of the PRESERVE score in the original and validation cohorts

From: Prediction of mortality in adult patients with severe acute lung failure receiving veno-venous extracorporeal membrane oxygenation: a prospective observational study

PRESERVE score class Original study population UKR ECMO registry
Number (%) Mortality rate up to six months post-ICU Number (%) In-hospital mortality rate
0 to 2 34 (25.0%) 3% 35 (12.1%) 11%
3 to 4 38 (27.9%) 21% 90 (31.1%) 28%
5 to 6 26 (19.1%) 46% 97 (33.6%) 40%
≥7 38 (27.9%) 84% 67 (23.2%) 64%
Total 136 (100.0%) 40% 289 (100.0%) 38%
PSEP   81%a   53% (95% CI 37–69)
  1. aThe 95% CI could not be calculated. CI, confidence interval; ECMO, extracorporeal membrane oxygenation; PSEP, prognostic separation index; UKR, University Medical Center Regensburg.