biostatic good que - sunitadoc

[ArchivalUser]

55yr man visits his primary care physcian with complaint of urinary frequency . exam finds 1 cm nodule on his prostate gld.
Psa is ordered and > 4 psa is considered abnormal.using this std sensitivity of 80% and specif 90:%. a recently published epidemological article found that crossectional study, 10% of men of this age has prostate ca. result of psa is 7. what is ur best estimate of likelihood that this man has prostate ca,
A 13%
B 25%
C 36%
D 47%
E 58%
F 69%

[ArchivalUser]

DDD

PPV is 47 %

[ArchivalUser]

pls explain

[ArchivalUser]

1000 people - 100 with prostate cancer 900 without disease

disease + disease +


PSA + 80 90



PSA - 20 810

100 900


PPV - 80 / 80+90 = 80/170 X 100 = 47 %

[ArchivalUser]

thanks

[ArchivalUser]

thanks vermis