15 results
Important Biostatistics and Epidemiology Equations

Sensitivity = TP / (TP + FN) = true positives / disease
disease present Specificity ... Sensitivity) / Specificity ... Sensitivity vs Specificity ... Biostatistics #statistics ... #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
It's eye-opening to realize how many tests with reasonable-appearing sensitivity or specificity will end up being
sensitivity or specificity ... despite having a specificity ... #Diagnosis #Statistics ... #Sensitivity #Specificity ... #Graph
Pap Smear Algorithm 
#Diagnosis #Pap #Smear #Test #Cervical #HPV #Screening #PrimaryCare #Management #Vaccination #Gynecology
Pap Smear Algorithm ... Diagnosis #Pap #Smear #Test ... #Cervical #HPV
USMLE Epidemiology and Biostatistics Summary
Meta-Analysis: pools data from several studies (greater power), limited by quality/bias of
Specificity (rule ... of positive tests ... NPV: proportion ... FN) Higher specificity ... sensitivity -> higher NPV
Specificity Calculation - Probability that a test correctly identifies those without the disease (true negative rate)

Specificity
Specificity Calculation ... Probability that a test ... negative rate) Specificity ... TN / (FP + TN) Specificity ... Biostatistics #statistics
This requires defining some general cutoff values for likelihood ratios.  These are admittedly arbitrary, but
between sensitivity/specificity ... #Diagnosis #Statistics ... #Sensitivity #Specificity ... #Relationship #Graph
Negative Predictive Value Calculation - Probability that someone with a negative test truly does not have
with a negative test ... NegativePredictiveValue #NPV ... Biostatistics #statistics
Diagnosis Adrenal Insufficiency - Algorithm

Step 1) Screening Test: 6-8AM Cortisol Level
 - Early morning cortisol levels
Insufficiency - Algorithm ... Step 1) Screening Test ... have almost 100% specificity ... ) Confirmation Test ... Insufficiency #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 ... the use of this test