Clinical trials

Question 1

what is a clinical trial

Answer 1

• test of whether a treatment or some other procedure works
• it needs to be a fair test

Question 2

the sensitivity of a diagnostic criterion (decision) is defined as…

Answer 2

…the fraction of sick patients who are diagnosed correctly

Question 3

what is sensitivity and specificity

Answer 3

sensitivity is the probability of a correct diagnosis when the person is sick

specificity is the probability of a correct diagnosis when the person is not sick

Question 4

what is positive predictive value (PPV)

Answer 4

probability that a diagnosis of a disease is correct

not the same as sensitivity

Question 5

Negative Predictive Value (NPV)

Answer 5

The NPV is the probability that a diagnosis of no disease is correct

Question 6

how to work out PPV

Answer 6

Count all people who fit in the criterion
only some of them will ACTUALLY have it
do actual over total of ppl who fit in the criterion