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Table 2 Cox proportional hazard ratios

From: Risk factors for joint replacement in knee osteoarthritis; a 15-year follow-up study

  Unadjusted Adjusteda
Variable Hazard ratio (95% CI) p value Hazard ratio (95% CI) p value
JSN grade 2.2 (1.7 – 2.9) <0.001 2.2 (1.7 – 3.0) <0.001
Total radiological score 1.3 (1.1 – 1.4) <0.001 1.3 (1.1 – 1.4) <0.001
BML grade, b 1.5 (1.2 – 1.7) <0.001 1.5 (1.2 – 1.8) <0.001
Synovitis grade, c 1.5 (1.2 – 1.9) 0.001 1.5 (1.2 – 1.9) 0.001
Effusion grade, d 1.3 (1.1 – 1.5) 0.002 1.3 (1.1 – 1.5) 0.001
  1. CI confidence interval, JSN joint space narrowing, BML bone marrow lesion
  2. aAdjusted for sex, age and BMI (body mass index); b Ordered into a ten point ordinal scale (Grade 1 = 0 - 10% BML, grade 2 = >10 - 20% BML etc.); c Ordered into a five point ordinal scale (Grade 1 = 0 - <5; grade 2 = 5 - <10 etc.); d Ordered into an eight point ordinal scale (Grade 1 = 0 - <5; grade 2 = 5 - <10 etc.) (maximum effusion score = 38)