Six articles report on investigation into the ACE program....... Four of these report data from randomized control trials (RCTs)......, and 2 report hospital surveys....... Sample sizes and methodology varied widely among studies. Three RCTs looked at the same sample of 651 patients......, and the remaining RCT looked at a separate sample of 1531 patients..... Methodology for all 4 RCTs is comparable; all studies used performance of ADLs as their primary indicator..... None of these 4 reports were blinded to participants or data collectors..., although this was not feasible given the design of the studies.