GORDIS EPIDEMIOLOGY 6TH EDITION
CELENTANO TEST BANK CERTIFICATION
REVIEW SET 2026 ANSWERS GUARANTEED
PASS
⫸ 2 components of validity Answer: Sensitivity and specificity
⫸ Sensitivity Answer: the ability of the test to identify correctly those
who have the disease
⫸ Specificity Answer: ability of the test to identify correctly those who
do not have the disease
⫸ Sensitivity and Specificity compared to what? Answer: There has to
be a gold standard(referent test)
⫸ 2x2 table for dichotomous test results Answer: Sensitivity =
TP/(TP+FN)
Specificity = TN/(TN+FP)
⫸ Continuous Variable Answer: -variable with no positive or negative
result like blood pressure
, -needs cutoff level above which a test results is considered positive and
below which is considered negative
⫸ Problems with False results Answer: False negative:
-delayed treatment
Probability = 100-sensitivty
False positives: Anxiety, discrimination
Probability = 100-specificity
⫸ Trade off between sensitivity and specificity Answer: Increase
Sensitivity by lowering cutoff level we decrease specificity
Increase specificity by raising cutoff level we decrease the sensitivity
⫸ Receiver operating Characteristic (ROC) Answer: Curve assess the
performance of a diagnostic test over a range of possible cut-point
values for the index test
⫸ Area under the curve Answer: Measure of the ability of a classifier to
distinguish between classes and is summary of ROC
(AUC=0.89 89% chance to correctly distinguish a normal from
abnormal reading on Xray)
CELENTANO TEST BANK CERTIFICATION
REVIEW SET 2026 ANSWERS GUARANTEED
PASS
⫸ 2 components of validity Answer: Sensitivity and specificity
⫸ Sensitivity Answer: the ability of the test to identify correctly those
who have the disease
⫸ Specificity Answer: ability of the test to identify correctly those who
do not have the disease
⫸ Sensitivity and Specificity compared to what? Answer: There has to
be a gold standard(referent test)
⫸ 2x2 table for dichotomous test results Answer: Sensitivity =
TP/(TP+FN)
Specificity = TN/(TN+FP)
⫸ Continuous Variable Answer: -variable with no positive or negative
result like blood pressure
, -needs cutoff level above which a test results is considered positive and
below which is considered negative
⫸ Problems with False results Answer: False negative:
-delayed treatment
Probability = 100-sensitivty
False positives: Anxiety, discrimination
Probability = 100-specificity
⫸ Trade off between sensitivity and specificity Answer: Increase
Sensitivity by lowering cutoff level we decrease specificity
Increase specificity by raising cutoff level we decrease the sensitivity
⫸ Receiver operating Characteristic (ROC) Answer: Curve assess the
performance of a diagnostic test over a range of possible cut-point
values for the index test
⫸ Area under the curve Answer: Measure of the ability of a classifier to
distinguish between classes and is summary of ROC
(AUC=0.89 89% chance to correctly distinguish a normal from
abnormal reading on Xray)
