Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
PLEASE ANSWER THE QUESTION BASED ON THE IMAGE PROVIDED
Transcribed Image Text:For items 40-41, refer to data below:
The rapid antigen detection test for streptococcal pharyngitis has
a positive and negative likelihood ratio of 20 and 0.05, respectively.
The pediatrician evaluates his 5-year-old patient who had sudden
onset of sore throat, exudative pharyngitis, and a fever of 39°C. He
estimates the pretest probability of streptococcal pharyngitis in this
child to be 50%. Use the likelihood ratio nomogram provided to
estimate post-test probability.
0.1T
99
0.2+
-98
0.5+
+95
2000
1+
1000
500
200
100
50
20
10
5-
+90
2+
-80
70
-60
+50
-40
10+
40. If the rapid antigen test is positive, what is the probability that
this child has actual streptococcal pharyngitis?
A. Approximately 75%
B. Approximately 85%
C. Approximately 95%
D. Approximately 98%
+30
+20
20
1-
30
0.5
0.2
0.1
0.05
0.02
0.01
-0.005
0.002
0.001
0.0005
40
50
10
60
5
70
80+
+2
90
41. If the rapid antigen test is negative, what is the probability that
this child truly does not have actual streptococcal pharyngitis?
A. Approximately 1%
B. Approximately 10%
C. Approximately 2%
D. Approximately 5%
95
-0.5
98
+0.2
99
-0.1
Pre-test
probability (%)
Likelihood
ratio
Post-test
probability (%)
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