The average effect size of the higher - income group is 34 % below that of the lower - income group. (investinginkids.net)
This means that showing a large effect size for some kind of family therapy at the end of treatment with the families that stay in treatment means little. (psychpage.com)
In general, of course, we want large effect sizes in our practice, and we want clinically meaningful effects. (psychotherapynetworker.org)