Sure.
Zimbabwe was 55%, Sudan was less than 64%.
I question the reluctance of the IRB to use this statistical information, at least to further investigate.
I'll close with an analogy. If there was a hospital where doctors were performing surgeries and the overall survival rate was 50%, and you had doctors for whom only 2% or 3% of their patients were living, surely that would be a cause for concern and for that hospital to at least look into the conduct and what's happening.