Epi

Question 1

sensitivity

Answer 1

proportion of dz correctly identified
test correctly id’s dz / all individuals with dz

Question 2

specificity

Answer 2

proportion of non-dz correctly identified
test correctly identifies non-dz / all individuals without dz

Question 3

incidence

Answer 3

risk of disease
#people with cases / number of people at risk
at a single point in time

Question 4

prevalence

Answer 4

burden of dz
#people affected / all persons in the population over a defined amt of time

Question 5

predictive value

Answer 5

pos (PPV) - how many who test positive actually test pos
true pos / all ps

neg (NPV) - how many who test neg do not have dz
true neg / all neg

Question 6

testing interpretation

Answer 6

how common is dz?
calculate PPV and NPV
timing of testing (window)
does the clinical scenario fit?

Question 7

relative risk

Answer 7

risk of dz in group of primary interest / risk of dz in comparison group