I think that's a pretty standard literacy criterion, and probably equivalent to "Level 1" in the US (which is in the low 90%s : https://nces.ed.gov/pubs2019/201

I think that's a pretty standard literacy criterion, and probably equivalent to "Level 1" in the US (which is in the low 90%s : https://nces.ed.gov/pubs2019/2019179/index.asp#:~:text=Adults%20classified%20as%20below%20level,simple%20forms%20(OECD%202013) https://nces.ed.gov/pubs2019/2019179/index.asp#:~:text=Adult....)