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Table 4 Comparison of outcome measurements between RETTS-a combined Red/Orange level and NEWS medium/high and NEWS medium/high

From: Pre-hospital triage performance and emergency medical services nurse’s field assessment in an unselected patient population attended to by the emergency medical services: a prospective observational study

   RETTS-A NEWS NEWS 2a
Time-sensitive condition n = 473    
Se 0.732 0.370 0.345
[0.679,0.782]b [0.313,0.429] [0.290,0.402]
Sp 0.540 0.789 0.833
[0.519,0.560] [0.772,0.805] [0.818,0.848]
PPV 0.158 0.172 0.197
[0.139,0.179] [0.141,0.203] [0.161,0.232]
NPV 0.944 0.914 0.915
[0.932,0.956] [0.900,0.926] [0.902,0.927]
ACC 0.560 0.744 0.781
[0.541,0.579] [0.727,0.761] [0.765,0.797]
AUROCc 0.636 0.579 0.589
[0.607,0.662] [0.549,0.609] [0.560,0.619]
Deviating VS/complication within 48 h n = 455    
Se 0.908 0.774 0.636
[0.870,0.941] [0.723,0.822] [0.581,0.691]
Sp 0.558 0.834 0.873
[0.538,0.578] [0.818,0.849] [0.860,0.887]
PPV 0.189 0.345 0.389
[0.168,0.211] [0.307,0.384] [0.347,0.433]
NPV 0.982 0.970 0.964
[0.974,0.989] [0.962,0.977] [0.955,0.972]
ACC 0.594 0.828 0.857
[0.575,0.613] [0.813,0.841] [0.843,0.870]
AUROC 0.733 0.804 0.792
[0.713,0.753] [0.777,0.830] [0.762,0.820]
Admission n = 2287    
Se 0.590 0.339 0.301
[0.564,0.616] [0.314,0.365] [0.276,0.327]
Sp 0.617 0.888 0.935
[0.590,0.643] [0.871,0.906] [0.921,0.948]
PPV 0.618 0.762 0.829
[0.590,0.644] [0.727,0.795] [0.794,0.862]
NPV 0.589 0.562 0.560
[0.562,0.615] [0.540,0.583] [0.539,0.581]
ACC 0.603 0.607 0.610
[0.585,0.622] [0.588,0.626] [0.591,0.629]
AUROC 0.603 0.614 0.618
[0.585,0.622] [0.598,0.629] [0.604,0.632]
48 h mortality n = 44    
Se 0.909 0.727 0.727
[0.795,1.000] [0.545,0.886] [0.545,0.886]
Sp 0.515 0.777 0.819
[0.496,0.534] [0.760,0.793] [0.804,0.834]
PPV 0.018 0.031 0.039
[0.011,0.026] [0.019,0.046] [0.023,0.057]
NPV 0.998 0.997 0.997
[0.996,1.000] [0.994,0.999] [0.994,0.999]
ACC 0.519 0.776 0.818
[0.499,0.538] [0.760,0.792] [0.804,0.833]
AUROC 0.712 0.752 0.773
[0.646,0.759] [0.661,0.831] [0.681,0.855]
30-day mortality n = 209    
Se 0.732 0.612 0.536
[0.651,0.809] [0.526,0.699] [0.445,0.627]
Sp 0.523 0.791 0.831
[0.503,0.543] [0.774,0.807] [0.816,0.846]
PPV 0.070 0.126 0.135
[0.056,0.084] [0.099,0.152] [0.106,0.166]
NPV 0.975 0.976 0.973
[0.967,0.983] [0.970,0.983] [0.966,0.980]
ACC 0.533 0.782 0.817
[0.513,0.553] [0.766,0.798] [0.802,0.832]
AUROC 0.627 0.702 0.684
[0.586,0.667] [0.657,0.746] [0.639,0.728]
  1. Se sensitivity, Sp specificity, PPV positive predictive value, NPV negative predictive value, AUROC area under the recieving operator curve
  2. a RETTS-A, NEWS and NEWS2 have been compared with the predefined cut off levels, RETTS-a (Orange/Red), NEWS (Medium/High), NEWS2 (Medium/HIgh)
  3. b Bootstrapped 99% confidence intervals
  4. c AUROC calculations based on predefined cut-off values for each system