I share some similar concerns that Corinna West noted. NH does not require Peer Support participants to have a 'diagnostic construct'--only to be "at risk" of getting one--like anyone surviving a hurricane, tornado, or a rape, might be. This may not necessarily qualify as being "currently in therapy"-for the purposes of this study.
Our culture of 'Individualism' rarely looks at more than 'dispositional' factors, such as those 'situational' and 'systemic' factors that social psychologist Philip Zimbardo identified in the preface of his book: "The Lucifer Effect: Understanding how good people do evil". His [Zimbardo's] mock 'Prison study' at Stanford Univ., was quite enlightening.
I also share the curiousity about this study's outcome though, and hope my comment avails the researchers feedback of questions that further clarification would give us answers about our eligibility for this study.
In college, one of my professors referred me to the college counseling service, though I didn't understand why-at the time. After meeting with the counselor-who was also a VietNam Veteran, he said to me: "You were in Attica, and I was in VietNam. We both 'cheated death'." Would this indicate "Cultural Humility"?