PPV, NPV, Specificity, Sensitivity, Vaccine effectiveness

Question 1

How do you calculate Positive Predictive Value?

Answer 1

true positives / total amount of positives (could be false positive)

Question 2

How do you calculate Negative Predictive Value?

Answer 2

true negatives / total amount of negatives (could be false negative)

Question 3

How do you calculate sensitivity?

Answer 3

True positives/ (True Positives+False Negatives) x 100 (percentage)​

Question 4

How do you calculate specificity?

Answer 4

True negatives/ (True negatives + False positives) x 100 (percentage)

Question 5

How do you calculate vaccine effectiveness?

Answer 5

(1 - (AR in vaccinated)/(AR in unvaccinated) ) x 100 (percentage)