Comment by Aurornis

Your link doesn't say "25%". It's also not an official, up-to-date statistics resource. It's website copy for the office of accessible education

The "1 in 4" number has been there as far back as Wayback Machine has that paged archived (2023): http://web.archive.org/web/20230628165315/https://oae.stanfo...

So it's definitely not a precise statistic, and it's likely out of date.