Four hundred women are enrolled in a study to evaluate the a…
Four hundred women are enrolled in a study to evaluate the accuracy of a test for pregnancy. 200 of the women were actually pregnant. 170 of the pregnant women had a positive test as did 40 of the women who were not pregnant. What is the probability (i.e., PPV) that a woman is pregnant given that she tested positive on a screening test? Test Pregnant? Yes No Total + 170 40 210 – 30 160 190 Total 200 200 400