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eip ii chapter 11 Flashcards | StudBud
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eip ii chapter 11
eip ii chapter 11
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1
which of the following is an example of treatment threshold?
pt (+) for lachman & ant drawer so PT decides to NOT perform pivot shift
pt (+) for lachman & ant drawer so PT decides to perform pivot shift
pt presents with severe edema and redness in R knee so PT refers out to PCP
pt progress plateaus so PT introduces more challenging tx interventions
2
what does it mean when a test has a likelihood ratio equal to 1?
pt does not have condition
test cannot be performed for safety reasons
pt has condition
coin flip as to if pt is likely to have or not have a condition
3
indicates likelihood that (-) test result was observed in a pt with condition compared to pt without condition
positive likelihood ratio
negative likelihood ratio
negative predictive value
positive predictive value
4
the probability below which a PT determines that a suspected condition is unlikely and forgoes dx testing
test threshold
standardized response mean (srm)
standard error of measurement (sem)
treatment threshold
5
masked comparison to a superior dx test or clinical measure is necessary to
maximizing tester bias to enhance validity
design similar research studies with different demographics
verify if test correctly identifies true (+)'s and true (-)'s
verifies if test can be reproduced with varying results
6
calculate specificity according to the chart
108/238 = .45
238/346 = 0.69
238/108 = 2.20
108/346 = 0.31
7
what is the interpretation of these results? (60% for + and 10% for -)
a LR- of 0.39 decreases probability of condition by 60%
a LR+ of 3.45 increases probability of condition by 60%
a LR- of 0.39 decreases probability of condition by 10%
a LR+ of 3.45 increases probability of condition by 10%
8
which of the following is the correct equation for sensitivity?
all pts with condition / pts with condition who test (-)
pts with condition who test (+) / all pts with condition
pts with condition who test (-) / all pts with condition
all pts with condition / pts with condition who test (+)
9
calculate positive predictive value based off the chart
138/246 = .56
108/138 = .78
138/35 = 3.94
138/108 = 1.28
10
calculate negative predictive value based off the chart
238/35 = 6.80
35/238 = .15
273/238 = 1.15
238/273 = .87
11
a test that produces stable results over time is demonstrating
study criterion
measurement validity
study credibility
measurement reliability
12
if the PT decides to not perform an empty can test because they suspect a labrum tear, which threshold are they using?
treatment threshold
test threshold
13
calculate LR+ based off the chart
1-sensitivity / specificity = .39
specificity / 1-sensitivity = 2.58
sensitivity / 1-specificity = 3.45
1-specificity / sensitivity = .30
14
calculate sensitivity based off the chart
138/173 = .80
108/346 = .31
108/238 = .45
138/35 = 3.94
15
what does this equation represent?
negative likelihood ratio
positive likelihood ratio
sensitivity
specificity
16
LR- has confidence interval of 95% with range of (0.20, 0.74). what does this mean if LR- is 0.39?
falls within narrow range; LR- is meaningful and test is valid
falls within wide range; LR- is not meaningful and test is invalid
falls within wide range; LR- is meaningful, but test may not be valid
falls within narrow range; LR- is meaningful but test may not be valid
17
the odds that pt has a condition based on the result of a diagnostic test
pretest probability
positive likelihood ratio
positive preductive value
posttest probability
18
a test that demonstrates measurement validity is said to
accurately reflect the background of research subjects
rule in or out the presence of a suspected condition
capture correctly what it is supposed to be testing
be reproducible with little to not bias
19
which of the following is the definition of treatment threshold?
PT should forgo futher testing to initiate tx
PT should continue testing and forgo tx
probability above which PT determines dx is unlikely
probability above which PT determines dx is likely
20
LR+ have values that are ____ and LR- have values that are ____
>-1 ; <1
>1 ; <1
>1; <-1
<1; >1
21
calculate LR- based off the chart
sensitivity / 1-specificity = 3.45
1-specificity / sensitivity = .30
1-sensitivity / specificity = .39
specificity / 1-sensitivity = 2.58
22
why are (+) and (-) predictive values limited in their usefulness?
unchanging and rigid regardless of prevalence of condition
based on overall prevalance of condition (may change over time)
require context for interpretation
no mathematical relationship between value and conditions
23
when a dx test has high specificity and low sensitivity, a positive result means you should
rule in condition
rule out condition
perform another dx test for different condition
further testing is needed
24
based off the case from previous chart, pt has pretest prob of 30%. what are the posttest prob for (+) and (-) LRs?
(+) = 60%; (-) = 10%
(+) = 30%; (-) = 30%
(-) = .39; (+) = 3.45
(-) = 60%; (+) = 10%
25
pretest probability is the odds than a pt has a condition based on
clinical presentation after dx test is conducted
clinical presentation before dx test is conducted
special tests conducted during prior PT
objective information provided by referring physician
26
LR+ has a confidence interval of 95% with an interval of (0.87, 6.8). what does this mean if LR+ 3.45?
falls within narrow range; LR+ is not meaningful and test may not be valid
falls within wide range; LR+ is meaningful but test may not be valid
falls within narrow range; LR+ is meaningful and test is valid
falls within wide range; LR+ is meaningful and test is valid
