“…57 Existing studies describe IRB structure, process, or outcomes and show that IRB judgments are inconsistent, as is their application of a standard set of regulations. 58,59 Practices and decisions vary between and within IRBs oft en without justifi cation, including determinations about risk level, inclusion criteria, and the appropriateness of methods of recruitment and consent. 55,60 Despite complaints about inconsistency, independence and local evaluation make some IRB variation inevitable.…”