3: Bowel screening (Public Health buzzwords) Flashcards Preview

Gastrointestinal Week 6 2016/17 > 3: Bowel screening (Public Health buzzwords) > Flashcards

Flashcards in 3: Bowel screening (Public Health buzzwords) Deck (7)
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1

What is incidence of a disease?

The number of new cases of disease in a population over a certain period of time

2

What is the prevalence of a disease?

The number of cases of the disease present in the population at a certain point in time

3

What is the sensitivity of a test?

Proportion of those WITH the disease who are correctly identified by a POSITIVE RESULT

i.e the ability of a test to correctly identify people who have a disease

4

What is the specificity of a test?

Proportion of those WITHOUT the disease who are correctly identified with a NEGATIVE RESULT

i.e the ability of the test to correctly identify people who don't have a disease

5

What is the positive predictive value of a test?

Testing true positives / True positives

6

What is the negative predictive value of a test?

Testing true negatives / True negatives

7

What is the yield of a test?

Number of previously undiagnosed people diagnosed with a disease by a screening programme