Sensitivity and specificty

Question 1

Incidence

Answer 1

Proportion of individuals who develop a condition over a defined time period. Takes into account new cases only; a measure of risk of becoming a case over a certain time period.

Question 2

Prevalence

Answer 2

Proportion of sampled individuals possessing the condition at a given time. Prevalence is most appropriately used to measure relatively stable, chronic conditions.

Question 3

Specificty

Answer 3

Likelihood of a true-negative result in those who are healthy (disease-free).

SpPin = SPecific test, when Positive helps to rule IN disease.

Question 4

Sensitivity

Answer 4

Likelihood of true-positive results with the disease.

SnNout = SeNsitive test when Negative helps to rule OUT disease.

Question 5

True Negative

Answer 5

The number of well people correctly classified by the test. Applying a test to the appropriate population in the recommended manner enhances likelihood of accurate results.

Question 6

True Positive

Answer 6

The number of sick people correctly identified by the test. Applying a test to the appropriate population in the recommended manner enhances likelihood of accurate results.

Question 7

False Negative

Answer 7

Persons with the disease who were deemed by the test to be at low risk or deemed to be without the disease.

The cost of a false negative test result is missed opportunity to intervene and false assurance.

Question 8

False Postive

Answer 8

Persons without the disease who were deemed by the test to have or to be at risk for the disease.

The cost of a false positive test result is time, worry, resources to prove health.