“…The success of blinding in magnet and placebo groups was not assessed in 18 of the randomized controlled trials. 9,[13][14][15][16][17][18][20][21][22][23][24][25][26]28,[30][31][32] Nonspecific effects may have contributed to the observed effects and may even have been the main factor contributing to the findings in some trials. Six trials 8,10,11,19,27,29 established that equal proportions of participants in the magnet and placebo groups believed they had been given magnetic devices; the 2 groups could thus be assumed to have similar expectations of pain relief.…”