Midterm: Focused Exam of Clinical Reasoning

Question 1

Formula for solving Positive LR?

Answer 1

Se/1-Sp or (a/n1)/(b/n2)

Question 2

Formula for solving Negative LR?

Answer 2

1-Se/Sp of (c/n1)/(d/n2)

Question 3

What does box a represent in the 2x2 diagram?

Answer 3

of people with the disease and findings

Question 4

what does box b represent in the 2x2 diagram?

Answer 4

of people without the disease, but with findings

Question 5

What does box c represent in 2x2 diagram?

Answer 5

of people with the disease, but without the findings

Question 6

What does box d represent in 2x2 diagram?

Answer 6

of people without the disease and no findings

Question 7

n1=?

Answer 7

a+c

Question 8

n2=?

Answer 8

b+d

Question 9

Positive LR of:
2=?
5=?
10=?

Answer 9

2=15%
5=30%
10=45%

Higher the more likely to rule in

Question 10

Negative LR of:

0. 5=?
1. 2=?
2. 1=?

Answer 10

0. 5=-15%
1. 2=-30%
2. 1=-45%

Lower the more likely to rule out.