Ace Your First Aid for the USMLE Step 1 (2022) Classes and Exams with Picmonic: #1 Visual Mnemonic Study Tool for General Allied Health Students
With Picmonic, facts become pictures. We've taken what the science shows - image mnemonics work - but we've boosted the effectiveness by building and associating memorable characters, interesting audio stories, and built-in quizzing. Whether you're studying for your classes or getting ready for a big exam, we're here to help.
Measures Association Between an Exposure and an Outcome
Formula
Odds of Exposure in Diseased (Sick) Group
a / c
Divided /
Odds of Exposure in Healthy Group
b / d
Interpretation
=1 Exposure does not affect odds
> 1 Exposure increases disease
< 1 Exposure decreases disease
2 mins
Relative Risk (RR)
Use
Used in Cohort Studies
Formula
Risk of Developing Disease
Equals =
Exposed Group
a / (a + b)
Divided by /
Unexposed Group
c / (c + d)
When Low Prevalence Odds Ratio Approximates Relative Risk
2 mins
Attributable Risk (AR)
Use
Proportion Exposure Increases Disease
Formula
Incidence of Diseased (Sick)
Equals =
Exposed Group
a / (a + b)
Minus -
Unexposed Group
c / (c + d)
1 min
Quantifying Risk: Contingency 2x2 Table Setup
Disease
Along Top (x axis)
Exposure
Along Side (y axis)
A: Exposed and Diseased (Sick)
B: Exposed and Healthy
C: Not Exposed and Diseased (Sick)
D: Not Exposed and Healthy
2 mins
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