PC: lecture 2 Flashcards
(29 cards)
the test that other tests are compared to
gold standard
most reliable and accurate
ability to detect change over time in the measured construct
responsiveness
what are common PT constructs
- ROM/flexibility
-muscle strength
-pain
-outcome measure
a
true +
b
false +
c
false -
d
true -
given that the ind has the condition, the probability that test will be +
sensitivity
what is formula for sensitivity
a/(a+c)
given that ind does NOT have the condition, probability that the test will be -
d/ (b+d)
a test with high sensitivity value that when - helps rule OUT a condition
sensitivity SnOUT
a test with high specificity value that when +helps rule IN a condition
specificity SpIN
if a test has high specificity is it a diagnositc or screening tool
screening
given a + test result, the probability that the ind has the condition
+ predictive value
given a - test result, the probability that the ind DOES NOT have the condition
(-) predictive value
what is formula for + predictive value
a/ (a+b)
what is formula for - predictive value
d/ (c+d)
what gives quantifiable values
likelihood ratio
what are limitations with using predictive values
-sample specific
-depend highly on prevalence of condition in study population
ex: condition with low prevalence will have:
-lower + predictive value
-higher - predictive value
likelihood ratio combine what values
specificity and sensitivity
given a + test result, increase in odds favoring the condition
LR+
given a - test result, decrease in odds favoring the condition
LR-
what is the formula for LR+
sensitivity/ (1-specificity)
what is the formula for LR-
(1-sensitivity)/specificity
