A common blood test performed on pregnant women to screen for chromosome abnormalities in the fetus measures the human chorionic gonadotropin (hCG) hormone. Suppose that in a given population, 6% of fetuses have a chromosome abnormality. The test correctly produces a positive result for a fetus with a chromosome abnormality 88% of the time and correctly produces a negative result for a normal fetus 81% of the time. What proportion of women who get a positive test result are actually carrying a fetus with a chromosome abnormality