@zjp Top tip: Sometimes when you click on links, there's more information on the page you arrive at. /s
Here's the link to the report, which is 84 pages long.
https://www.researchgate.net/publication/390162187_Life_in_Media_Survey_A_Baseline_Study_of_Digital_Media_Use_and_Well-being_Among_11-to_13-year-olds
"Similar to the pattern observed with online bullying, kids who own a smartphone are slightly less likely to report
feeling depressed most days compared with those who don’t own a smartphone (21% vs. 26%), which may be due
to socioeconomic status affecting smartphone ownership and depression, or to reverse causation, where parents of children with depression may be less likely to give them a smartphone to protect them from the harmful effects of digital media use. By contrast, children who own a tablet are more likely to report feeling depressed compared to those who don’t (26% vs. 19%)."