Chat about Novel Coronavirus - 2019-nCoV - COVID-19

You are reading a single comment by @Greenbank and its replies. Click here to read the full conversation.

•

in reply to @Greenbank

So if 5% of the population have had it then using 98.5% and 99.5% figures we get:-

-ve result would be 99.973% accurate
+ve result would be 91.284% accurate

If 1% of the population have had it then:-
-ve would be 99.995% accurate
+ve would be 66.779% accurate

If 10% of the population have had it then:-
-ve would be 99.944% accurate
+ve would be 95.673% accurate

What are you doing to get a shift in sensitivity/specificity based on an outside factor?

•

Greenbank in reply to @

The sensitivity and specificity aren't changing. The derived accuracy of a result changes depending on how prevalent the condition is amongst the tested population as the relative

The less prevalent the condition is in the population the more false positives you'll get.

The more prevalent the condition is in the population the more false negatives you'll get.

Both of these factors affect the eventual accuracy. See: https://www.lfgss.com/comments/15296147/

About

Avatar for Greenbank @Greenbank started