Validation of a Simple Score for Mortality Prediction in a Cohort of Unselected Emergency Patients

Table 5

Predictive characteristics of the SPS. Predictive characteristics for each possible point threshold of the simple prognostic score, with the chosen threshold of ≥2. Corresponding contingency tables can be found in the online supplement.

	≥1	CI 95%	≥2	CI 95%	≥3	CI 95%	≥4	CI 95%
True prevalence	0.06	0.05, 0.06	0.06	0.05, 0.06	0.06	0.05, 0.06	0.06	0.05, 0.06
Sensitivity	0.99	0.97, 1	0.94	0.91, 0.96	0.76	0.71, 0.80	0.4	0.35, 0.46
Specificity	0.25	0.25 0.26	0.61	0.6, 0.62	0.80	0.79, 0.81	0.93	0.92, 0.93
PPV	0.08	0.07 0.08	0.13	0.12, 0.15	0.19	0.17, 0.21	0.26	0.22, 0.30
NPV	1	0.99, 1	0.99	0.99, 1	0.98	0.98, 0.99	0.96	0.96, 0.97
PLR	1.32	1.29, 1.34	2.43	2.32, 2.53	3.84	3.54, 4.17	5.55	4.72, 6.54
NLR	0.04	0.01, 0.11	0.09	0.06, 0.15	0.30	0.25, 0.37	0.65	0.59, 0.71
Youden J	0.24	0.22, 0.26	0.55	0.51, 0.58	0.56	0.50, 0.61	0.33	0.27, 0.39

PPV, positive predictive value; NPV, negative predictive value; PLR, positive likelihood ratio; NLR, negative likelihood ratio; J Youden Index.