Not related to the content of the article, but am I the only one bothered with the way the article spell ranges: "six to 15 minutes", "Twelve of 18 men", "six of 24 females" ...
Numbers beginning a sentence, title, or text heading"
https://owl.purdue.edu/owl/research_and_citation/apa6_style/...
If you’re unsure which modifier to write and which to express numerically, try it both ways. Be sure the way you express the numbers is in the clearest way possible.
For example, using the APA guide[1] for numbers (thanks @OJFord for pointing out my error): “Six to 15”, “12 of 18”, Six of 24”.
Edit: As @temp8964 correctly pointed out, there are situations where words are recommended[2].
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[1]: https://apastyle.apa.org/
[2]: https://apastyle.apa.org/style-grammar-guidelines/numbers/wo...
I find it so much more jarring than either “six to fifteen” or “6–15.”