Placebo Effect- Thiels research wasn't double-blind and so the patients knew they were being treated by a fully functional electromedicine device along with taking helpful supplements. Henry K. Beecher (1904-1976) concluded that, across the 26 studies he analyzed, an average of 32% of patients responded to placebo. (https://www.medicinenet.com/script/main/art.asp?articlekey=31481)
the facts: 48% of Thiels patients reported a substantial improvement (not complete) by taking nutritional supplements and using the Clark Zapper.
How much of that was due to the Zapper and how much to the supplements and how much to the placebo effect? we don't know.
I used to hang around New Agers and they are ga-ga for Rife and Clark Zappers. So there is definitely a fertile mental soil there for the placebo effect.
When people get tired of not completely getting well then they try the Beck blood purifier and get complete results. I know because Parazappers failed customers come to me for help. And I do help them, feeling sorry for them that they were so gullible to believe in the effectiveness of a Clark Zapper or Rife machine.