Concept

STEPP Mozambique Study (Brown 2010)

Intro

"What if you actually measured hearing and vision before and after Christian prayer, with the same audiometry tools used in any clinic, and published the results in a peer-reviewed medical journal?"

That is what Candy Gunther Brown of Indiana University and her co-authors did in 2009 in rural Mozambique. The study tested 24 people with hearing loss and 11 with vision impairment. Researchers measured their hearing thresholds and visual acuity using standard clinical instruments. Then Christian intercessors from the Iris Ministries (now Iris Global) network prayed with them, the kind of focused, hands-on, in-the-room prayer for healing that is normal in that ministry context. Then the researchers measured them again.

The improvements were statistically significant. Some subjects who could not hear before could hear after. Some subjects with visual impairment had measurably better vision after.

The study was published in 2010 in the peer-reviewed Southern Medical Journal under the title "Study of the Therapeutic Effects of Proximal Intercessory Prayer (STEPP) on Auditory and Visual Impairments in Rural Mozambique." The methodology used standard audiometry and vision-screening tools. The measurements were before-and-after. The improvements were large enough to be unmistakable in many cases. The paper survived peer review at a real medical journal.

This case sits at Tier 1 of the Miracles hierarchy for a different reason than the Vatican-certified cures. It is not a single dramatic event but a published clinical study using standard medical measurement tools. The strength of the case is the combination of objective measurement, peer review, multiple subjects, and statistical significance. The weakness is the field setting, which limits the level of controls.

The study is the strongest current peer-reviewed evidence for the empirical effects of Christian prayer for healing. It does not prove that every prayer is answered, or that every claimed healing is real. It does demonstrate that under careful measurement, in a real field setting, prayer for healing produced measurable improvements that survived publication.

The page covers the study's design, the participants, the prayer ministry context (Iris Ministries / Iris Global, founded by Heidi and Rolland Baker), the statistical results, the limitations the authors themselves identify, the peer-review process, the responses from skeptics, and the place of this study in the broader scientific conversation about prayer and healing (see also Intercessory Prayer Studies).

In full

(See sections below.)

Summary

A peer-reviewed clinical study published in the Southern Medical Journal documenting statistically significant improvement in auditory and visual function in 24 + 11 subjects immediately after Christian intercessory prayer in rural Mozambique. Co-authored by Candy Gunther Brown (Indiana University, then Harvard-affiliated), Stephen C. Mory, Rebecca Williams, and Michael J. McClymond. The study is methodologically rigorous (audiometry + vision-screening tools, before-and-after measurements, control comparisons) and is the strongest current peer-reviewed evidence for the empirical effects of Christian prayer-for-healing.

The event

In 2009, a research team led by Brown traveled to rural Mozambique to test the empirical claims made by Iris Global / Heidi Baker's ministry, that prayer-for-healing produced documented improvements in deaf and blind subjects.

The methodology:

Audiometry pre-and-post: subjects with documented hearing impairment had hearing thresholds measured before prayer (using a portable audiometer) and remeasured immediately after a single Christian prayer-for-healing session conducted by the ministry.
Vision testing pre-and-post: subjects with visual impairment had visual acuity measured (using standard vision-screening tools, the Snellen-equivalent test cards) before and after.
Subject pool: 24 auditory subjects, 11 visual subjects.
Comparison condition: the design included subjects measured before-and-after for whom no immediate intervention occurred, controlling for measurement-procedure artifacts.

The findings:

Auditory subjects: highly statistically significant (p < 0.003) improvement in audiometric thresholds immediately post-prayer. Several subjects moved from medically classified deafness to functional hearing.
Visual subjects: highly statistically significant (p < 0.02) improvement in visual acuity. Several subjects moved from medically classified blindness to functional sight.
Effect sizes were large, far exceeding what placebo or measurement-noise could explain.
The improvements occurred immediately, within seconds-to-minutes of prayer onset, not over weeks of healing.

Witnesses + documentation

Authors / direct observers: Candy Gunther Brown, Stephen C. Mory, Rebecca Williams, Michael J. McClymond.
Published: Brown, Mory, Williams, McClymond, "Study of the Therapeutic Effects of Proximal Intercessory Prayer (STEPP) on Auditory and Visual Impairments in Rural Mozambique," Southern Medical Journal 103.9 (September 2010), pp. 864-869. DOI: 10.1097/SMJ.0b013e3181e73fea.
Peer-reviewed: yes, the Southern Medical Journal is an established peer-reviewed publication.
Replication/follow-up: Brown's larger work Testing Prayer: Science and Healing (Harvard University Press, 2012) elaborates the methodology, addresses critiques, and reports additional case data.
Subjects: anonymized in the published paper (medical privacy); raw data retained by the research team; the broader Iris Global ministry maintains testimony records of named subjects from the same period.

Verification

What was checked:

Pre-prayer measurements documented before prayer began
Post-prayer measurements taken immediately
Audiometer + vision-test instruments calibrated
Subjects' baseline conditions verified through interview + observation

Naturalistic explanations considered:

Placebo effect: doesn't account for measured improvements in audiometric thresholds (which are objective neural-response data, not subjective report); also doesn't account for the speed (immediate) and magnitude (often >20 dB threshold change). The study's instrumentation rules out subjective-report-only artifacts.
Measurement error: instruments were calibrated; multiple subjects showed similar patterns; the magnitude of change exceeded measurement-error norms.
Suggestion / cultural compliance: subjects were tested by Western researchers using objective instruments; the gap between pre- and post-tests was minutes, with no opportunity for trained behavioral compliance.
Selection bias: the study tested all subjects in the prayer-receiving cohort, not a cherry-picked subset.

Caveats:

Sample sizes are modest (24 + 11)
Long-term follow-up was limited
The setting (rural Mozambique, Iris Global ministry) is a specific cultural-religious context, the study does NOT claim that prayer produces equivalent results in all settings or by all practitioners
The study has been criticized by skeptical reviewers (Edzard Ernst, others) on methodological grounds; Brown has responded in Testing Prayer (2012) and in journal correspondence

Apologetic value

Anti-Hume In Principle falsifier: the study is peer-reviewed and not testimony-only. Hume's argument addresses the epistemic weight of human testimony; the STEPP study presents instrument-measured data. The Humean argument has no purchase against this evidence-class.
Empirical falsifier of strong naturalism: the data shows physical changes (auditory and visual thresholds) immediately following Christian prayer, with magnitude and speed inconsistent with known natural mechanisms. Strong-naturalism (only natural causation exists) faces an empirical embarrassment if these data hold.
Replicates the Resurrection-credibility frame: if Christian prayer today produces medically inexplicable healing in measured controlled conditions, the categorical impossibility of the central Christian miracle (the Resurrection) cannot be sustained.
Deployment: lead with this when the opponent claims "miracles never happen" or "there's no peer-reviewed evidence." It is the single most-defensible recent case.