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epidemiology biostatistics calculations diagnosis equations mnemonic sensitivity formulas betadglucan calculation falsepositives fungal galactomannan laboratory matrix table testing usmle
Sensitivity is the proportion of truly diseased persons in the screened population who are identified as
#PositivePredictiveValue ... #NegativePredictiveValue ... Calculation #Table #PPV ... #NPV #Formulas ... #Statistics #Matrix
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 Important Biostatistics and Epidemiology Equations Sensitivity = TP / (TP + FN) = true positives / disease
disease present Specificity ... Sensitivity) / Specificity ... Sensitivity vs Specificity ... Biostatistics #statistics ... #PPV #NPV
Negative Predictive Value Calculation - Probability that someone with a negative test truly does not have
Negatives #NegativePredictiveValue ... #NPV #Biostatistics ... #statistics #Epidemiology
Positive Predictive Value Calculation - Probability that someone with a positive test actually has the disease Positive
Positives #PositivePredictiveValue ... #PPV #Biostatistics ... #statistics #Epidemiology
USMLE Epidemiology and Biostatistics Summary Meta-Analysis: pools data from several studies (greater power), limited by quality/bias of
PPV: proportion ... prevalence is low, then PPV ... NPV: proportion ... -> higher PPV ... sensitivity -> higher NPV
1,3-Beta-D-Glucan and Galactomannan Testing Sensitivity Specificity and False Positives 1,3-Beta-D-Glucan • Cell wall component of many fungi
Testing Sensitivity Specificity ... 96% • Higher specificity ... dx of IA PPV ... NPV >90% (In most
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