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Table 4 Univariate predictors of use of opioid pain medication after primary total knee arthroplasty

From: Predictors of use of pain medications for persistent knee pain after primary Total Knee Arthroplasty: a cohort study using an institutional joint registry

  Univariate analysis, 2-year follow-up Univariate analysis, 5-year follow-up
  Odds ratio (95% CI) P-value Odds ratio (95% CI) P-value
Male gender (reference female) 0.51 (0.42, 0.63) < 0.001a 0.66 (0.52, 0.85) 0.001a
Age (reference ≤ 60 yrs)       
   > 60 to 70 yrs 0.78 (0.35, 0.77) 0.001a 0.59 (0.43, 0.80) 0.001a
   > 70 to 80 yrs 0.60 (0.47, 0.76) < 0.001a 0.54 (0.39, 0.73) < 0.001a
> 80 yrs 0.52 (0.33, 0.82) 0.04a 0.95 (0.61, 1.49) 0.84
Body mass index (reference < 25 kg/m2)       
   2.0 to 29.9 1.15 (0.84, 1.59) 0.37 1.13 (0.77, 1.63) 0.54
   30.0 to 34.9 1.17 (0.84, 1.62) 0.35 1.02 (0.69, 1.51) 0.92
   35.0 to 39.9 1.67 (1.17, 2.38) 0.005a 0.85 (0.54, 1.36) 0.50
   ≥ 40.0 2.32 (1.61, 3.35) < 0.001a 1.50 (0.91, 2.48) 0.11
Deyo-Charlson index (5-point change) 1.06 (0.83, 1.36) 0.62 0.88 (0.65, 1.19) 0.40
Depression (reference no depression) 1.93 (1.51, 2.47) <0.001a 1.85 (1.32, 2.60) <0.001a
Anxiety (reference no anxiety) 1.58 (1.14, 2.19) 0.006a 1.13 (0.69, 1.85) 0.62
  1. aSignificant odds ratios and P-values; CI, confidence interval.