18 results
Important Biostatistics and Epidemiology Equations

Sensitivity = TP / (TP + FN) = true positives / disease
and Epidemiology Equations ... disease present Specificity ... Biostatistics #statistics ... #Epidemiology #Equations ... #PPV #NPV
Sensitivity is the proportion of truly diseased persons in the screened population who are identified as
Specificity is the ... #Sensitivity #Specificity ... Calculation #Table #PPV ... #NPV #Formulas ... #Statistics #Matrix
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Positive Predictive Value Calculation - Probability that someone with a positive test actually has the disease

Positive
PositivePredictiveValue #PPV ... Biostatistics #statistics ... #Epidemiology #Equations
Negative Predictive Value Calculation - Probability that someone with a negative test truly does not have
NegativePredictiveValue #NPV ... Biostatistics #statistics ... #Epidemiology #Equations
Specificity Calculation - Probability that a test correctly identifies those without the disease (true negative rate)

Specificity
Specificity Calculation ... negative rate) Specificity ... TN / (FP + TN) Specificity ... Biostatistics #statistics ... #Epidemiology #Equations
Pap Smear Algorithm 
#Diagnosis #Pap #Smear #Test #Cervical #HPV #Screening #PrimaryCare #Management #Vaccination #Gynecology
Pap Smear Algorithm ... Test #Cervical #HPV
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
Genital Ulcer - Differential Algorithm
Painful
 - H. ducreyi (Chancroid)
 - HSV
Painless
 - T pallidum (Chancre)
 -
- Differential Algorithm ... Chlaymydia - HPV ... #Differential #Algorithm
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
Oral Cavity Lesions in a patient with HIV/AIDS
White plaque
 - Pseudo-membranous candidiasis
 - Oral hairy leukoplakia
Mass - Wart (HPV ... Differential #Diagnosis #Algorithm