A new home pregnancy test is available in Broncoville, a town with 100,000 peopl
ID: 97711 • Letter: A
Question
A new home pregnancy test is available in Broncoville, a town with 100,000 people. The kit is 98% sensitive and 96% specific. The current home pregnancy test available at BroncoGreens costs $12 each and was 99.9% sensitive and 98% specific. The new home pregnancy test costs $6 each. The prevalence of couples attempting to have a baby in Broncoville is approximately 15.26% per 100,000 persons. Develop a 2 x 2 table and calculate the following: 1. Calculate the Positive Predictive Value (PPV) 2. Calculate the Negative Predictive Value (NPV)
Explanation / Answer
The data given here are:
From these data we can prepare a 2 x 2 table.
From sensitivity we can find the values of A and C.
A= 98/100*15.26=14.95
C=15.26-14.95= 0.31
From specificity, we can find the values of C and D.
C= 96/100*84.74= 81.35
D= 84.74-81.35= 3.39
Now we can calculate the PPV and NPV.
Positive Predictive value(PPV)= A/(A+B)*100
= 14.95/(14.95+81.35)*100
= 15.52%
Negative Predictive value(NPV)= D/(D+C)*100
=3.39/(3.39+0.31)*100
= 91.62
True positive (A) False positive (B) T-test positive False negative (C) True negative (D) T-test negative Attempt (15.26) Non attempt (84.74) TotalRelated Questions
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