You certainly can calcúlate the positive predictive value, you have 85% of the deseased that tested positive, so they are true positives, you also have 15% that tested positive but have no symptoms so they are false positive, since PPV= TP/TP+FP x 100, then you have all the information you need in order to obra in the positive predictive value, so i think tour answer might be wrong..
USMLE Step 1 Community
189 followers
20 Dec 2024
I think answer is wrong
Question:
A physician is conducting a research on Group A Streptococcus (GAS) pharyngitis. He observes that the prevalence of GAS pharyngitis was 10% in the community studied. Out of this group, 85% were symptomatic and found to have the bacterium in their throat on culture. On the other hand, 15% were culture positive but had no symptoms. The doctor also tested a group of individuals who were all symptomatic but without the bacterium on culture. Which of the following tests cannot be evaluated in the described study design?
Options:
A)Sensitivity
B)Specificity
C)Positive Predictive Value
D)Negative Predictive Value
E)Prevalence
I think answer is wrong
Question:
A physician is conducting a research on Group A Streptococcus (GAS) pharyngitis. He observes that the prevalence of GAS pharyngitis was 10% in the community studied. Out of this group, 85% were symptomatic and found to have the bacterium in their throat on culture. On the other hand, 15% were culture positive but had no symptoms. The doctor also tested a group of individuals who were all symptomatic but without the bacterium on culture. Which of the following tests cannot be evaluated in the described study design?
Options:
A)Sensitivity
B)Specificity
C)Positive Predictive Value
D)Negative Predictive Value
E)Prevalence