October Virtual Journal Club – Summative Assessment

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Question 1 of 5

1. Question
Sensitivity..
- is the true negative rate.
- can be calculated by dividing the number of true positives by all positive tests.
- decreases with prevalence.
- can be calculated by dividing the number of true positives by the number of patients who actually have the disease.
- is useful for ruling in a diagnosis.
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Question 2 of 5

2. Question
Positive predictive value…
- decreases with prevalence.
- can be calculated by dividing the number of false positives by all positive tests.
- is the probability that if you have a positive result, you actually have the condition that is being tested for.
- is complicated to understand therefore has no use in explaining test results to patients.
- is the probability of having a positive test if you have the condition compared to having a positive test if you don’t have the condition.
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Question 3 of 5

3. Question
Positive likelihood ratio…
- is the probability of having a positive test if you have the condition compared to having a positive test if you don’t have the condition
- which is low suggests the test is useful.
- can be calculated using Sykes Normagram.
- of 1 suggests that the test is the perfect test.
- can be calculated by dividing the number of true positives by all positive tests.
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Question 4 of 5

4. Question
Prevalence…
- increases as negative predictive value increases.
- is the number of new cases in a population per year.
- is the post-test probability that a patient has a disease in a given population.
- is calculated by dividing the number of patients with a condition in a population by the number of patients that don’t have a condition.
- is the proportion of a population who have a specific characteristic in a given time period.
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Question 5 of 5

5. Question
Referral bias…
- this is a form of selection bias.
- could potentially result in a type 2 error.
- is a form of confirmation bias.
- Is a form of observer bias.
- is a form of reporting bias.
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October 2021 Virtual Journal Club – Diagnosis of Traumatic Pneumothorax: A Comparison between Lung Ultrasound and Supine Chest Radiographs

October Virtual Journal Club – Summative Assessment

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