Public Health

Question 1

State the definition and equation for Sensitivity.

Answer 1

% of people with disease who have a positive test.

Question 2

State the definition and equation for Specificity.

Answer 2

% of healthy people who have a negative test.

Question 3

State the definition and equation for Positive Predictive Value (PPV).

Answer 3

% of people with a positive test result who have disease (aka post-test probability of health).

Question 4

State the definition and equation for Negative Predictive Value (NPV).

Answer 4

% of people with a negative test result who do not have disease (aka post-test probability of health).

Question 5

State the definition and equation for Prevalence?

Answer 5

% of total people tested who have disease (aka pre-test probability of disease).

(number of reported cases in a population at a specific time).

Question 6

State the definition of Incidence?

Answer 6

’ the occurence rate, frequency of a disease’/ (how likely is a given medical condition to occur in a population).

it is an estimate of the probability of the risk of developing a disease during a specific period of time.