Wikipedia, which quotes it from a paper from 2017 [1], which in turn takes the number from a paper from 2007. Though taking a quick peek at some papers on speci

Wikipedia, which quotes it from a paper from 2017 [1], which in turn takes the number from a paper from 2007. Though taking a quick peek at some papers on specific forms of intersex, it seems like there are both large uncertainties in the actual numbers (about a factor of 2) and large regional differences (a specific form of intersex being an order of magnitude more common in one country than in another seems to be common). Though maybe that's just down to the available data. 1: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5866176/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5866176/