Statistics

Question 1

Sensitivity

Answer 1

Ability of a test to detect the condition when it is present

= TP / (TP + FN)

Question 2

Specificity

Answer 2

Ability of a test to correctly exclude the condition when the condition is absent
= TN / (TN + FP)

Question 3

PPV

Answer 3

Proportion of positives that correspond to the presence of the condition
= TP/ (TP + FP)

Question 4

NPV

Answer 4

Proportion of negatives that correspond to the absence of the condition
= TN / (TN + FN)