stats

Question 1

when are odds rations the usual reported measure

Answer 1

case-control studies
- approximates to relative risk if the outcome of interest is rare

Question 2

how to calculate odds ration

Answer 2

calculate the odds of the two different outcomes
then divide them by each other

Question 3

how to calculate sensitivity

Answer 3

true positive/ true postive + false negative (total number with the disease)

Question 4

how to calculate specificity

Answer 4

true negative/ true negative + false positive

Question 5

continuous variable

Answer 5

example BMI
something that can be a range of values

Question 6

hawthorne effect

Answer 6

group changing it’s behaviour due to the knowledge that they are being studied

Question 7

what does a NNT of 200 mean

Answer 7

200 people needing to be treated to prevent 1 outcome
in a group of 1000 that would mean 5 people would be prevented

Question 8

type of bias when volunteers withdraw from a study and are not interpreted with the result

Answer 8

attrition bias