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Table 3 Performance of OHCA score at different cut-off points

From: Comparison of different clinical risk scores to predict long-term survival and neurological outcome in adults after cardiac arrest: results from a prospective cohort study

OHCA category  > I  > II  > III
  Cut-off 20 points Cut-off 40 points Cut-off 60 points
A: mortality at 2 years
 Total number of patients n 231 93 8
 2-year survivors n (%) 48 (20.8) 2 (2.1) 0 (0)
 Death within 2 years n (%) 183 (79.2) 91 (97.9) 8 (100)
 Sensitivity 75.9 (70.0, 81.2) 37.8 (31.6, 44.2) 3.3 (1.4, 6.4)
 Specificity 72.4 (65.1, 78.9) 98.9 (95.9, 99.9) 100.0 (97.9, 100.0)
 PPV 79.2 (73.4, 84.3) 97.8 (92.4, 99.7) 100.0 (63.1, 100.0)
 NPV 68.5 (61.2, 75.1) 53.4 (47.8, 59.0) 42.8 (37.9, 47.7)
 LLR +  2.75 (2.14, 3.54) 32.85 (8.20, 131.55) n. a
 LLR− 0.33 (0.26, 0.42) 0.63 (0.57, 0.70) 0.97 (0.94, 0.99)
B: mortality at 6 years    
 Total number of patients n 202 93 8
 6-year survivors n (%) 19 (9.4) 2 (2.1) 0 (0)
 Death within 6 years n (%) 183 (90.6) 91 (97.9) 8 (100)
 Sensitivity 75.9 (70.0, 81.2) 37.8 (31.6, 44.2) 3.3 (1.4, 6.4)
 Specificity 62.7 (48.1, 75.9) 96.1 (86.5, 99.5) 100.0 (93.0, 100.0)
 PPV 90.6 (85.7, 94.2) 97.8 (92.4, 99.7) 100.0 (63.1, 100.0)
 NPV 35.6 (25.7, 46.3) 24.6 (18.8, 31.2) 18.0 (13.7, 22.9)
 LLR +  2.04 (1.42, 2.93) 9.63 (2.45, 37.82) n. a
 LLR− 0.38 (0.28, 0.52) 0.65 (0.58, 0.73) 0.97 (0.94, 0.99)
C: neurological outcome at 2 years
 Total number of patients n 212 93 8
 Good neurological outcome n (%) 27 (12.7) 2 (2.1) 0 (0)
 Poor neurological outcome n (%) 185 (87.3) 91 (97.9) 8 (100)
 Sensitivity 75.8 (69.9, 81.1) 37.3 (31.2, 43.7) 3.3 (1.4, 6.4)
 Specificity 69.7 (59.0, 79.0) 97.8 (92.1, 99.7) 100.0 (95.9, 100.0)
 PPV 87.3 (82.0, 91.4) 97.8 (92.4, 99.7) 100.0 (63.1, 100.0)
 NPV 51.2 (42.0, 60.4) 36.3 (30.2, 42.7) 27.4 (22.6, 32.6)
 LLR +  2.50 (1.81, 3.45) 16.60 (4.18, 65.96) n. a
 LLR− 0.35 (0.27, 0.45) 0.64 (0.58, 0.71) 0.97 (0.95, 0.99)
  1. Data presented as mean (95% CI) unless otherwise specified
  2. LLR + positive likelihood ratio, LLR− negative likelihood ratio, NPV negative predictive value, OHCA Out-of-Hospital Cardiac Arrest Score, PPV positive predictive value