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USMLE Epidemiology and Biostatistics Summary Meta-Analysis: pools data from several studies (greater power), limited by quality/bias of
Epidemiology and Biostatistics ... PPV: proportion ... prevalence is low, then PPV ... median < mode) Reliability ... #Epidemiology #Biostatistics
Important Biostatistics and Epidemiology Equations Sensitivity = TP / (TP + FN) = true positives / disease
Important Biostatistics ... = Rule IN #Biostatistics ... #specificity #PPV ... #NPV
Venous Oxygen Saturation to qualify reliability of VBGs #Diagnosis #VBG #ABG #Saturation #Conversion #Reliability #Comparison
Saturation to qualify reliability ... Saturation #Conversion #Reliability
Fungal Biomarkers: Comparing Beta-D-Glucan and Aspergillus Galactomannan Beta-D-Glucan: • Polysaccharide cell wall component of many fungi •
Spec -80% for IA, PPV ... < 50%, NPV > 90%
An Overview on P-Values "The widespread use of "statistical significance" (generally interpreted as "p <= 0.05") as
#PValues #BioStatistics
Algorithm showing a stepwise approach to the assessment and investigation of a possible neuropathy. CIDP, chronic
neuropathy with liability
TYPE I & TYPE II ERRORS SENSITIVITY & SPECIFICITY = SNOUT & SPIN Sensitive Tests that
Type2 #Errors #Biostatistics
Arterial Lines & Waveforms Arterial lines permit continuous invasive blood pressure measurement, frequent arterial blood sampling, and
PRESSURE VARIATION (PPV ... Pressure Variation (PPV ... volume (increased PPV
Sensitivity is the proportion of truly diseased persons in the screened population who are identified as
Calculation #Table #PPV ... #NPV #Formulas
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 Sensitivity Specificity False-Positive False-Negative Contingency Table / confusion matrix Sensitivity refers to the test's ability to correctly
ConfusionMatrix #Biostatistics
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