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Likelihood Ratio Formula for Diagnostic Tests

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Questions and Answers

What does a negative likelihood ratio (LR-) describe?

The likelihood that a patient without a disease tests positive (correct)
The likelihood that a patient with a disease tests positive
The likelihood that a patient without a disease tests negative
The likelihood that a patient with a disease tests negative

If the negative likelihood ratio (LR-) for a test is 0.2, what can be inferred?

The test moderately decreases the probability of disease when negative
The test is not useful for ruling out the disease when negative
The test is not useful for ruling in the disease when positive
The test significantly decreases the probability of disease when negative (correct)

What does a positive likelihood ratio (LR+) describe?

The likelihood that a patient with a disease tests positive (correct)
The likelihood that a patient without a disease tests positive
The likelihood that a patient without a disease tests negative
The likelihood that a patient with a disease tests negative

If the positive likelihood ratio (LR+) for a test is 10, what can be inferred?

The test significantly increases the probability of disease when positive (B) Signup and view all the answers

Which of the following statements about likelihood ratios is correct?

A LR+ > 1 and LR- < 1 indicate a good diagnostic test (A) Signup and view all the answers

If the negative likelihood ratio (LR-) for a test is 0.5, what is the interpretation?

The test moderately decreases the probability of disease when negative (C) Signup and view all the answers

If the positive likelihood ratio (LR+) for a test is 20, what is the interpretation?

The test significantly increases the probability of disease when positive (A) Signup and view all the answers

Which of the following statements about likelihood ratios is true?

A LR+ > 10 and LR- < 0.1 indicate a highly accurate diagnostic test (B) Signup and view all the answers

If the negative likelihood ratio (LR-) for a test is 0.8, what is the interpretation?

The test does not change the probability of disease when negative (A) Signup and view all the answers

Which of the following statements about likelihood ratios is false?

A LR+ < 1 indicates that a positive test decreases the probability of disease (A) Signup and view all the answers

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