That response doesn't address the questions I posted. For instance, you referred to 20% of respondents being "severely depressed". That's a clinical term, and I find it difficult to believe that can be diagnosed by a survey, much less the cause being discovered that way.The research is Legitimate and was carried out via feedback forms that where completed in a number of secondary schools and Girl Guides groups we have worked and are not over reaching.
Claims like that, when read by someone who understands the topics and terms, seem over-reaching. They may not be, but you should expect challenges like that and be ready to defend them with an explanation of how that was determined. Telling people it's legitimate is not sufficient.