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Table 5 Estimated probability of improvement in pain signs of canine hip dysplasia related to four, three and two age strata. The results are expressed in percent with 95% confidence intervals. (n) = number of dogs.

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

Age strata Years Dogs (n) Probability of improvement 95% confidence intervals p-values
Four age ≤2.6 20 87.5 % 71.0% – 96.5% 0.057
strata 2.7 – 4.6 20 65.5 % 45.7% – 82.1%  
  4.7 – 5.9 20 57.7% 36.9% – 76.7%  
  ≥6.0 18 74.1% 53.7% – 88.9%  
Three ≤2.5 19 86.7% 69.3% – 96.2% 0.053
age strata 2.6 – 6.0 41 63.2% 49.3% – 75.6%  
  ≥6.1 18 74.1% 53.7% – 88.9%  
Two age ≤4.0 36 80.4% 67.6% – 89.8 % 0.047
strata > 4.1 42 63.8% 50.1% – 76.0%