Are there demonstrable effects of distant intercessory prayer? A meta-analytic review.
BACKGROUND
The use of alternative treatments for illness is common in the United States. Practitioners of these interventions find them compatible with personal philosophies. Consequently, distant intercessory prayer (IP) for healing is one of the most commonly practiced alternative interventions and has recently become the topic of scientific scrutiny.


OBJECTIVE
This study was designed to provide a current meta-analytic review of the effects of IP and to assess the impact of potential moderator variables.


METHODS
A random effects model was adopted. Outcomes across dependent measures within each study were pooled to arrive at one omnibus effect size. These were combined to generate the overall effect size. A test of homogeneity and examination of several potential moderator variables was conducted.


RESULTS
Fourteen studies were included in the meta-analysis yielding an overall effect size of g = .100 that did not differ from zero. When one controversial study was removed, the effect size reduced to g = .012. No moderator variables significantly influenced results.


CONCLUSIONS
There is no scientifically discernable effect for IP as assessed in controlled studies. Given that the IP literature lacks a theoretical or theological base and has failed to produce significant findings in controlled trials, we recommend that further resources not be allocated to this line of research.
Masters
Kevin S
KS
Department of Psychology, Syracuse University, NY 13244-2340, USA. kemaster@syr.edu
Spielmans
Glen I
GI
Goodson
Jason T
JT
D001524:Behavioral Medicine / Q000706:statistics & numerical data; D006297:Health Services Accessibility; D006379:Helping Behavior; D006801:Humans; D012067:Religion