Test results |
Staphylococcus aureus
| Other staphylococci | Total |
---|
Positive | a | b | a + b |
Negative | c | d | c + d |
Total | a + c | b + d | (a + b) + (c + d) = n |
- Where,
- a = True positives
- b = False positives
- c = False negatives
- d = True negatives
- Diagnostic sensitivity = d/(b + d)
- Diagnostic specificity = a/(a + c)
- Positive predictive value (PPV) = a/(a + b)
- Negative predictive value (NPV) = d/(d + c)
- n = 60