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Table 2 Number of dogs with achieved treatment effect recorded as change in pain signs of canine hip dysplasia (CHD) assessed by the owner, related to the two stratification factors bodyweight and degree of CHD. Distribution of dogs according to the non-design stratum gender is also shown.

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

   Pain signs of canine hip dysplasia  
Factor Design strata Complete recovery Large improvement Mild improvement No change in signs Mild aggravation Large aggravation Total number of dogs
Body-weight ≤20.0 kg 0 3 1 1 0 1 6
  20.1–34.9 kg 5 14 5 9 2 3 38
  ≥35.0 kg 6 11 7 9 1 0 34
Canine hip dysplasia Mild/moderate 6 14 7 11 2 0 40
  Severe 5 14 6 8 1 4 38
  Non-design stratum        
Gender Female 5 15 10 12 2 2 46
  Male 6 13 3 7 1 2 32