EBM Flashcards
1
Q
usefulness =
A
(relevance x validity) / (work)
2
Q
unacceptable loss to follow up
A
> 20%
3
Q
NNT =
A
100 / (% treatment - % control)
4
Q
summary review
A
- cover full breadth of topic
- overview of disease etiology, diagnosis, prognosis, management
- address a number of questions
- good for background questions
5
Q
synthesis review
A
- defines 1 or 2 specific questions
- carefully finds all available evidence, evaluates validity, and reports answer to Q
- useful for foreground questions
6
Q
meta-analysis
A
- statistical technique
- combines findings from independent studies
- treats data as if from 1 big study
- usually only done with RCTs
7
Q
degree of inconsistency
A
<40% : not important (good)
30-60%: moderate heterogeneity
50-75%: substantial
75-100%: considerable
8
Q
post-test probability =
A
pre-test probability, given the test result
THE SAME TEST WILL PERFORM DIFFERENTLY GIVEN BACKGROUND PROBABILITY
9
Q
post-test odds =
A
pretest odds x LR
10
Q
basic criteria
A
-test is sufficiently sensitive and specific
11
Q
minimally useful
A
- test changes diagnosis
- label patient
12
Q
more useful
A
-test changes treatment
13
Q
very useful
A
test changes outcome
14
Q
maximum benefit
A
test is worthwhile to patients/society
15
Q
authority based guidelines
A
BOGSATS
- consensus guidelines
- low quality
