LR, Sensitivity And Specificity

Question 1

What do likelihood ratios greater than 1.0 indicate?

Answer 1

Increase probability

Values greater than 1.0 suggest that the test result increases the likelihood of the condition being present.

Question 2

What do likelihood ratios less than 1.0 indicate?

Answer 2

Decrease probability

Values less than 1.0 suggest that the test result decreases the likelihood of the condition being present.

Question 3

What do likelihood ratios near 1.0 indicate?

Answer 3

Change probability very little or not at all

Values around 1.0 imply that the test result does not significantly affect the likelihood of the condition.

Question 4

What is the effect of a likelihood ratio of infinity?

Answer 4

Maximum increase in probability

An infinite likelihood ratio suggests that the test result guarantees the presence of the condition.

Question 5

What likelihood ratio corresponds to a 30% decrease in probability?

Answer 5

0.5

A likelihood ratio of 0.5 indicates that the probability of the condition decreases by 30%.

Question 6

Fill in the blank: A likelihood ratio of 2 indicates a _______.

Answer 6

Increase probability

A likelihood ratio of 2 suggests that the probability of the condition is doubled.

Question 7

What approximate change in probability corresponds to a likelihood ratio of 0.2?

Answer 7

-45%

A likelihood ratio of 0.2 suggests a significant decrease in the probability of the condition by approximately 45%.

Question 8

What likelihood ratio would indicate no change in probability?

Answer 8

1.0

A likelihood ratio of 1.0 indicates that the test result does not change the probability of the condition.