1) A cross-sectional study of injection drug use (IDU) and HIV infection identif
ID: 3330269 • Letter: 1
Question
1) A cross-sectional study of injection drug use (IDU) and HIV infection identified an increased association between IDU and HIV infection as compared to non-IDU. The table below presents their data on this topic:
Injection Drug User
HIV Infected
Yes
No
Yes
45
78
No
19
214
The probability a participant in this study had HIV infection is ______?
2
A cross-sectional study of injection drug use (IDU) and HIV infection identified an increased association between IDU and HIV infection as compared to non-IDU. The table below presents their data on this topic:
Injection Drug User
HIV Infected
Yes
No
Yes
45
78
No
19
214
The probability a participant in this study was not an IDU is ______?
Injection Drug User
HIV Infected
Yes
No
Yes
45
78
No
19
214
Explanation / Answer
1. P(HIV infection) is given as sum of first column divided by total which is (45+19)/(45+19+78+214)= 0.1798
2. P(Not IDU) is given by the second row sum divided by total which is (19+214)/(45+78+19+214)=0.6545
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