Sensitivity

The proportion of individuals with a condition who are correctly identified as such by a test. It is calculated thus: Sensitivity = TP/(TP+FN), where TP is the number of true positives and FN is the number of false negatives. The

Diagnosis Present Absent

OJ

a

b

PL,

(true positive)

(false positive)

OJ

c

d

3

(false negative)

(true negative)

314 Sensitivity Analysis terms 'positive' and 'negative' are used to refer to the presence or absence of the condition of interest. In the figure, sensitivity = a/(a + c). Cf. Negative Predictive Value, Positive Predictive Value, Specificity.

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