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Table 3 Owner's guess of treatment given versus actual treatment given and their prospective wishes regarding gold bead implantation for their dog in a clinical controlled therapy trial of 80 dogs with canine hip dysplasia. The two opinions of the owner were requested at the end of the 6 month trial and before the randomization code was broken. One dog owner per dog expressed their opinion.

From: Stratification, Blinding and Placebo Effect in a Randomized, Double Blind Placebo-controlled Clinical Trial of Gold Bead Implantation in Dogs with Hip Dysplasia

Owner's guess of treatment given Treatment actually given Wanted gold implantation if not given previously
  Placebo Gold Yes No
Placebo 8 3 11 0
Gold 22 30 35 17
Don't know 12 3 13 2