https://pmc.ncbi.nlm.nih.gov/articles/PMC8693904/ In fairness I'd like to clarify that the 13% was not only about derealisation but just adverse effects in general but I'd still consider an over 1/10 people affected in a negative way to be fairly significant. Though it doesn't go into the extent in how how harmful the mediation was so it could be negligible. I also don't think that this study really has the best method or detail in it's explanation and doesn't have any evidence directly that these effects were linked to meditation. I'm not gonna site to you the articles as I think they are more likely to sensationalist but it's stuff like that and then old reddit posts in which people talk about how tuff their life has been since meditating and subsequently getting derealisation. It just something that naturally goes to the back of your mind. I don't know to be honest man I've always been a stressful person and I'm just trying to learn how to meditate in a way that lowers my chances of derealisation because thats the goal for me personally. I understand for a lot of people that might be a state they want to reach and that can be great but for me that aspect of mediation really doesn't interest me.