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Table 3 Prediction of subsequent hospital mortality determined on day with the best discriminating power for P. aeruginosa BSI.

From: Comparison of severity of illness scoring systems for patients with nosocomial bloodstream infection due to Pseudomonas aeruginosa

Scoring system

Day with best discriminating power

Cut-off point*

Youden Index

Sensitivity (%)

Specificity (%)

Overall correctness

PPV (%)

NPV (%)

APACHE II

-1

22

0.579

70.0

87.9

26.0

84.0

76.3

SAPS II

-1

33

0.509

93.3

57.6

34.0

66.7

90.5

SOFA

+1

5

0.391

81.5

57.6

46.3

61.1

79.2

  1. PPV = positive predictive value, NPV = negative predictive value, * = value giving the best Youden index.