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Table 4 Estimated odds ratios for lower joint effusion grade between time points and differences in radiography grade at baseline and associated 95% confidence intervals

From: An international multi-centre prospective study on the efficacy of an intraarticular polyacrylamide hydrogel in horses with osteoarthritis: a 24 months follow-up

Odds ratio Estimate 95% confidence limits
Month 1 vs Baseline 13.21 5.14 33.96
Month 3 vs Baseline 38.18 11.72 124.40
Month 6 vs Baseline 106.14 32.31 348.61
Month 12 vs Baseline 91.52 28.19 297.07
Month 24 vs Baseline 171.80 46.35 636.76
Radiography grade −1 3.12 1.90 5.13
  1. OR for lower joint effusion grade from month 1 to month 24 relative to baseline increased from 13 (95% CI = 5–34) to 172 (95% CI = 46–637). OR for lower joint effusion grade was 3.1 (95% CI = 1.9-5.1) when radiographic grade at baseline was low by one grade.