The study featured a much larger group of subjects (150 rather than 40), and concluded that the only difference between groups that received healing prayer and those that did not was that the group receiving prayer were more likely to guess they were the experimental subjects rather than the control group.
A study with a bigger participant pool (150 individuals instead of 40) revealed that the sole distinction between groups receiving healing prayer and those who didn't was that the group receiving prayer believed they were the experimental participants, not the control group.