Obviously just a sample size of 1, but I -- a teenager -- am the only one out of all my friends that isn't depressed, and I'm fairly sure I spend more time on t

Obviously just a sample size of 1, but I -- a teenager -- am the only one out of all my friends that isn't depressed, and I'm fairly sure I spend more time on the computer/phone than all of them. Not to imply that the conclusion is wrong, I could just be an outlier, but it's likely just a rule of thumb when attempting to diagnose/identify potential causes of a problem.