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Table 3 Example of binary classification values

From: Animal models and conserved processes

   Gold standard (human)
   GS+ GS-
Test T+ 22 26
  T- 22 30
Sensitivity = 22/(22 + 22) = 0.5    
Specificity = 30/(26 + 30) = 0.54    
Positive Predictive Value = 22/(22 + 26) = 0.46    
Negative Predictive Value = 30/(22 + 30) = 0.58    
  1. Binary classification values for cardiovascular toxicity test in monkeys from 25 compounds also tested in humans [48]. Note the values are approximately what would be expected from a coin toss.