For further reference, using the 2015 rate of breast cancer in women aged 25-49 in Australia, which is 20 in 10,000, you'd see 8 true positives for every 2,000 false positives, or a PPV of ~0.4%
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This is the paradox of screening - if the test isn't incredibly precise, and the condition is quite rare (as breast cancer is before age 50), then it can often do more harm than good!
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