QuestionSBA
QuestionChoice
This is the positive predictive value for this test. This is the proportion of patients with a positive test who truly have the condition. It is calculated as patients with DVT AND a positive test (67) / total number of patients with a positive test (95).
10006949
d
0.71 (71%)
QuestionChoice
This would be the correct answer for specificity. This is a measure of the proportion of patients without the disease who are correctly excluded by the test. It is calculated as patients without DVT with a negative test (94) / total number of patients without DVT (122).
10006947
b
0.77 (77%)
QuestionChoice
This is the negative predictive value (NPV) for this test. This is the proportion of patients with a negative test who truly do not have the condition. It is calculated as patients without DVT AND a negative test (94) / the total number of patients with a negative result (101).
10006948
c
0.93 (93%)
QuestionChoice
10% would be correct as the false negative rate, or the proportion of those with the condition who will test negative. This is calculated using the formula 1 - sensitivity (1-0.90).
10006950
e
0.10 (10%)
QuestionChoice
Sensitivity is the proportion of people with the condition who have a positive test result. In this question, the correct methodology would be patients correctly identified as having DVT (67) / all patients with DVT (74). This means that for every 100 people with DVT, 90 will have a positive test result.
10006946
a
0.90 (90%)
Concept
Chapter
2693
4325
Evaluation of a diagnostic test
Topic
178
Medical Statistics
13936
A clinical trial for a new test to detect deep vein thrombosis (DVT) is carried out on 196 participants. The results of the trial are shown below:
67 Patients with confirmed DVT received a positive test result, while 7 patients with confirmed DVT had a negative test result.
28 of the patients without DVT received a positive result, while 94 patients without a DVT received a negative result.

Which of the following values represents the sensitivity of this test?
a