Public Health

Question 1

Criteria for screening
disease factor x3
test factors x5
treatment factors x2

Answer 1

disease factors: important health problem, fully understood, detection will lead to benefit.
Test factors: simple, safe, precise, valid, acceptable
Treatment factors: treatment available, early detection beneficial

Question 2

what is sensitivity

Answer 2

the proportion of people with the disease who test positive for the disease (a/(a+c))

Question 3

what is specificity

Answer 3

the proportion of people without the disease who test negative for the disease (d/(d+b))

Question 4

What is the positive predictive value?

Answer 4

proportion of people who test positive who actually have the disease (a/(a+b)

Question 5

What is the negative predictive value?

Answer 5

proportion of people who test negative who actually do not have the disease (d/d+c))