One study, by Anastasi and Newberg, was extremely relevant to my research interests because it dealt with the rosary and anxiety. They hypothesized that recitation of the ritualized rosary would lower anxiety compared to simply being exposed to a religious video. Although, their sample size was very small the results were promising and the rosary group reported decreased anxiety. I thought that it was important that they were interested in the ritual of the rosary having the effect on the test subjects rather than other variables I had read about elsewhere.
Anastasi, M. W., & Newberg, A. B. (2008). A preliminary study of the acute effects of religious ritual on anxiety. The Journal of Alternative and Complementary Medicine, 14(2), 163-165.