Stats

Question 1

What is sensitivity

Answer 1

TP / (TP + FN )
Proportion of patients with the condition who have a positive test result

Question 2

What is specificity

Answer 2

TN / (TN + FP)
Proportion of patients without the condition who have a negative test result

Question 3

What is positive predictive value?

Answer 3

TP / (TP + FP)
The chance that the patient has the condition if the diagnostic test is positive

Question 4

what is negative predictive value?

Answer 4

TN / (TN + FN)
The chance that the patient does not have the condition if the diagnostic test is negative

Question 5

what is the likelihood ratio for a positive test?

Answer 5

sensitivity / (1 - specificity)

How much the odds of the disease increase when a test is positive

Question 6

Likelihood ratio for a negative test result

Answer 6

(1 - sensitivity) / specificity

How much the odds of the disease decrease when a test is negative

Question 7

What is relative risk ratio?

Answer 7

relative risk ratio = EER / CER

Question 8

What is absolute risk?

Answer 8

AR = (EER - CER

Question 9

What is the RRI or Relative risk reduction

Answer 9

RRI = (EER - CER) / CER

Question 10

What is numbers needed to treat?

Answer 10

1/(Absolute risk reduction)

Question 11

What is odds ratio?

Answer 11

odds of one event with treatment divided by odds of another event with placebo

Question 12

What is standard error of the mean?

Answer 12

SEM = SD / square root (n)