> the frequency of intersex is almost certainly less than 0.02%
is the quote in the paper.
( More broadly, the 'restricted' definition falls just under that percentage:
> "conditions in which chromosomal sex is inconsistent with phenotypic sex, or in which the phenotype is not classifiable as either male or female", the prevalence of intersex is about 0.018% )
However on a societal scale it is sufficient number of people to present issues that need addressing.
1 in 2,000 is 10 in 20,000 is 100 in 200,000 is 1,000 in 2 million (the ~ pop. of my state capital city) is 10,000 at least in Australia (now well past 20 million).
This is more than enough to justify the changes to the Australian passport system made decades ago, expanding what was previously a forced binary choice to better represent actual reality.
And yet, our author of the linked paper still moves to claim:
> This has not stopped the misconception that “sex is not binary” from spreading, ...
mere paragraphs after agreeing on the frequency of the clearly non binary people.