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First, though the analyses are done well they demonstrate a very small correlation between digital media use and non-clinical measure of the ADHD symptoms. This means the study is a proof of concept that tells us we need very large samples when we design future studies because the possible effects are extremely small, second, the study doesn't measure either digital media use or ADHD directly. For both the study relies on survey responses provided by the student in question. It is not clear if teachers or parents would rate the children similarly or if the self-reported measure of digital screen use is correlated with either actual behaviour or higher quality survey items.