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A comment on Parents in Ireland town to voluntarily ban smartphones for kids as old as 13. Parent comment
Here is evidence for screen time being dose dependent after more than 1 hour, but it is old so none of the kids in that study had grown up with smartphones https://www.researchgate.net/publication/283687526_Dose-resp...
This is a summary article: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7012622/ you will find the dose dependt point is the first paragraph under the heading "Key Points".
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Here is evidence for screen time being dose dependent after more than 1 hour, but it is old so none of the kids in that study had grown up with smartphones https://www.researchgate.net/publication/283687526_Dose-resp...
This is a summary article: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7012622/ you will find the dose dependt point is the first paragraph under the heading "Key Points".