MacLaddy
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http://en.wikipedia.org/wiki/Health_effects_of_radonIn the late 20th century and early 21st century, some "health mines" were established in Basin, Montana which attracted people seeking relief from health problems such as arthritis through limited exposure to radioactive mine water and radon.[66] The practice is controversial because of the "well-documented ill effects of high-dose radiation on the body."[67] Radon has nevertheless been found to induce beneficial long-term effects.[55]...
http://rheumatology.oxfordjournals.org/content/39/8/894.longResults. The two groups showed a similar baseline situation. After completion of treatment, relevant clinical improvements were observed in both groups, with no notable group differences. However, the follow‐up revealed sustained effects in the radon arm, and a return to baseline levels in the sham arm. After 6 months, marked between‐group differences were found for both end‐points (pain intensity: −16.9%, 95% confidence interval −27.6 to −6.2%; AIMS score: 0.57, 95% confidence interval 0.16 to 0.98). The between‐group differences were statistically significant for both overall means (pain intensity, P = 0.04; AIMS, P = 0.01).
Conclusion. Marked short‐term improvements in both groups at the end of treatment may have masked potential specific therapeutic effects of radon baths. However, after 6 months of follow‐up the effects were lasting only in patients of the radon arm. This suggests that this component of the rehabilitative intervention can induce beneficial long‐term effects...
http://www.springerlink.com/content/39vbmv9gqg73b7qe/Results
Five clinical trials with a total of 338 patients and comparing the effect on pain of radon baths (three trials) or radon speleotherapy (two trials) with control intervention in degenerative spinal disease (two trials), rheumatoid arthritis (one trial) and ankylosing spondylitis (two trials) met the inclusion criteria. In meta-analysis, the pooled data showed no difference immediately after treatment (P=0.13) but significantly better pain reduction in the radon group than the control group at 3 months (P=0.02) and 6 months (P=0.002) after treatment...
