OnlineMedEd: Epidemiology and Stats - "Diagnostic Tests" Flashcards

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1
Q

In a 2x2 table, ___________ is always on the top.

A

disease status

Test status is always on the side.

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2
Q

Positive disease status is always on the __________ column.

A

lefthand

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3
Q

Give the formula for sensitivity as well as a verbal description.

A

Sensitivity = TP / (TP + FN)

Sensitivity shows how many people with the disease will test positive. How many people with the disease will test positive? Sensitive tests have low false negative rate.

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4
Q

Give the formula for specificity as well as a verbal descriptor.

A

Specificity = TN / (TN + FP)

Specificity shows how many people without the disease will test negative. How many people with the disease will test negative? Specific tests have low false positive rate.

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5
Q

Give the formula for PPV as well as a verbal description.

A

PPV = TP / (TP + FP)

PPV is the likelihood that a positive result is true. It increases with increased prevalence.

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6
Q

Give the formula for NPV as well as a verbal description.

A

NPV = TN / (TN + FN)

NPV is the likelihood that a negative result is true. It decreases with increased prevalence.

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