Flashcards in Epidemiology Deck (11):

1

## What are the parts of PICO?

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-patients (population)

-intervention (experimental group)

-comparison (control group)

-outcome

2

## What drags down sensitivity?

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False negatives

Sensitivity + FNR = 100%

3

## Formula and definition of sensitivity

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Sensitivity = a / (a+c)

-true positive rate

-what percent of ppl w/ the disease get a positive test result

4

## Formula and definition of specificity

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Specificity = d / (b+d)

-true negative rate

-what percent of ppl w/o the disease get a negative result

5

## What is the real value of interest of a test result

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Positive predictive value (which = posttest probability)

-value of ppl w/ a positive result who truly have teh disease

6

## Formula and definition of PPV

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+PV = a / (a+b)

-proportion of ppl w/ a positive test result who actually have the disease

7

## Formula and definition of NPV

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-PV = d / (c+d)

-proportion of ppl w/ a negative test result who truly don't have the disease

8

## What result from what kind of test would rule a diagnosis in ?

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SpPIN

-positive result on a specific test (low false positives) rules in a diagnosis

9

## What results from what kind of test would rule out a diagnosis?

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SnNOUT

-negative result on a sensitivity test (low false negative) rules out a diagnosis

10

## Describe what a likelihood ratio is

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LR is one test result for two populations

ex] LR of 11 means that the test results are 11 times more likely in a patient with the disease than in a patient without the disease

11