28 results
Important Biostatistics and Epidemiology Equations

Sensitivity = TP / (TP + FN) = true positives / disease
Biostatistics #statistics ... #specificity #PPV ... #NPV
The graph illustrates the differences in the onset and duration of action for various types of
The graph illustrates ... glulisine), Regular, NPH ... Peaks #Timeline #Graph
Sensitivity is the proportion of truly diseased persons in the screened population who are identified as
correctly diagnose a case ... that any given case ... Calculation #Table #PPV ... #NPV #Formulas ... #Statistics #Matrix
USMLE Epidemiology and Biostatistics Summary
Meta-Analysis: pools data from several studies (greater power), limited by quality/bias of
Proves cause-effect ... PPV: proportion ... NPV: proportion ... sensitivity -> higher NPV ... but not on the causal
Reversible Neurocognitive Disorders (Reversible Causes of "Dementia")
 • Structural/Mass: Subdural Hematoma, NPH, Intracranial tumor
 • Infection:
Disorders (Reversible Causes ... Subdural Hematoma, NPH ... differential #diagnosis #causes
Menstrual Cycle Physiology: Ovarian Cycle – Ovulation Explained

Around Day 14, estrogen exerts sudden +++ positive feedback
and release LH causes ... as shown in the graph
Negative Predictive Value Calculation - Probability that someone with a negative test truly does not have
NegativePredictiveValue #NPV ... Biostatistics #statistics
Basophilia - Differential Diagnosis Framework

Basophils < 1% of the total white blood cell count
Basophils function similarly
Statistical ... Chickenpox Other Causes ... Differential #Diagnosis #causes
Causes of Encephalopathy - Differential Diagnosis Algorithm
Hyperacute:
 - Primary Neurologic: Vascular (IS, ICH), Seizure, Migraine, Trauma
Causes of Encephalopathy ... Degenerative, NPH ... Diagnosis #Algorithm #Causes
Arterial Lines & Waveforms
Arterial lines permit continuous invasive blood pressure measurement, frequent arterial blood sampling, and
PRESSURE VARIATION (PPV ... Pressure Variation (PPV ... intrathoracic pressure and causes ... volume (increased PPV