Hope Shared "EBM" - 6 Picmonics
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EBM
Cohort Study
- Observational
- Longitudinal
- Studies risk from exposure
- Retrospective
- (Asks) "Who developed disease?"
- Prospective
- (Asks) "Who will develop disease?"
1 min
Case Control Study
- Observational
- Retrospective
- Compares those with disease to those without
- (Asks) "What happened?"
- Measurement
- Odds Ratio
47 secs
Cross-Sectional Study
- Observational
- (Asks) "What's Happening?"
- Data at One Specific Point in Time
- (Finds) Frequency of Disease
- Measurement
- Prevalence
49 secs
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
Odds Ratio (OR)
- Use
- Case Control Studies
- 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
Common Statistical Tests
- Determine If Comparing Numerical Or Categorical Variables
- Numerical Variables
- T-Test For Comparing Means Of Two Groups
- ANOVA For Comparing Means In Greater Than Three Groups
- Comparing Mean Values On Normal/Bell Distribution
- Categorical Variables
- Chi-Squared Test For Comparing Categorical Outcomes In Large Sample Sizes
- Fisher's Exact Test For Comparing Categorical Outcomes In Small Sample Sizes
4 mins
