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Table 3 Unadjusted association of income with pain, activity limitation and improvement in knee function after primary total knee arthroplasty

From: Income and patient-reported outcomes (PROs) after primary total knee arthroplasty

  2 years 5 years
  Odds ratio (95% CI) Pvalue Odds ratio (95% CI) Pvalue Odds ratio (95% CI) Pvalue Odds ratio (95% CI) Pvalue
Pain/function: Moderate to severe pain Moderate to severe functional limitation Moderate to severe pain Moderate to severe functional limitation
≤ US$35, 000 0.68 (0.50 to 0.92) 0.01 0.82 (0.67 to 0.99) 0.04 0.86 (0.60 to 1.22) 0.39 0.92 (0.74 to 1.15) 0.47
> US$35, 000 to US$45, 000 0.80 (0.64 to 1.01) 0.06 0.99 (0.85 to 1.15) 0.90 0.90 (0.65 to 1.25) 0.55 1.00 (0.82 to 1.23) 0.99
> US$45, 000 (ref) 1.00   1.00   1.00   1.00  
Improvement: Better Much better Better Much better
≤ US$35, 000 1.5 (0.9 to 2.4) 0.13 1.1 (0.7, 1.7) 0.61 1.2 (0.7 to 2.0) 0.57 1.2 (0.8 to 1.9) 0.39
> US$35, 000 to US$45, 000 1.1 (0.7 to 1.6) 0.72 1.0 (0.7 to 1.5) 0.83 1.1 (0.7 to 1.7) 0.78 1.1 (0.8, 1.7) 0.56
> US$45, 000 (ref) 1.00   1.00   1.00   1.00