Chapter 5: Assessing the validity and reliability of diagnostic and screening tests. Flashcards
We need tests and measures that can accurately identify cases of disease and absence of disease true or false.
True
What is validity ?
the ability to distinguish between who has a disease and who does not.
What are the two components of validity
Sensitivity and specificity
What is sensitivity?
The ability of a test to correctly identify who has the disease.
What is specificity?
The ability of a test to identify those who do not have the disease.
Tests with high sensitivity helps us avoid false negatives, true or false.
True
Tests with high specificity helps us avoid false positives, true or false.
True
The more sensitive we make a test, the less specific it becomes, true or false.
True
The more specific we make a test the less sensitive it becomes, true or false.
True
What is a sequential testing?
A two-stage testing
What is the formula for net sensitivity?
correctly identified true positives after sequential test/true positive in population
What is the formula for net specificity?
Total sum of the total negatives from both 1st and 2nd test/ true negatives in population
When a disease has a high prevalence, it also has a high predictive value, true or false.
True
Test and screening programs are most effective when we identify high risk populations, true or false.
True
What is reliability?
Refers to the repeatability of a test.
