There was no control group to check how significant that number (13 out of 30) was[1]. This article is very misleading (but at least mentions that the study was

There was no control group to check how significant that number (13 out of 30) was[1]. This article is very misleading (but at least mentions that the study was not peer reviewed). [1] http://pielot.org/pubs/PielotRello2017-MHCI-DoNotDisturb.pdf http://pielot.org/pubs/PielotRello2017-MHCI-DoNotDisturb.pdf