Suicides usually only happen one at a time and would usually have some family members that would be halluded it was alluded to they this religion had something to do with it. If fear of hurting a family member prevents an honest evaluation on whether or not the WTBTS control over a person has anything to do with the suicide, you will never get to the chance to look into the matter.
If what a previous poster squid was true about the BOE letter stating that the WTBTS does not want any participation in surveys, then that alone should be reason to think that prey know the numbers are higher than the populace.
Don't let fear of hurting a few person thoughts or feeling prevent research that could save actual lives.
Here are a few links that I had seen in the past regarding Jws and their mental health.
NJY
http://marvinshilmer.blogspot.com/2013/02/jehovahs-witnesses-and-psychiatric.html