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Table 1 Characteristics of patients with 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

  Two-year follow-up(n= 7,139) Five-year follow-up(n= 4,234)
Mean age, yrs (± SD) 68 ± 10 68 ± 10
Men/women (%) 44/56 45/55
Bilateral (%) 20 23
Age groups (%)   
   ≤ 60 yrs 18 18
   > 60 to 70 yrs 35 37
   > 70 to 80 yrs 38 38
   > 80 yrs 8 7
Body mass index, kg/m2 (%)   
   < 25.0 13 13
   25.0 to 29.9 35 36
   30.0 to 34.9 29 43
   35.0 to 39.9 14 7
   ≥ 40.0 9 7
ASA score (%)   
   Class I to II 58 58
   Class III to IV 42 41
Cemented (%)   
   Yes 98.0 99.5
   Hybrid 2.0 0.5
Underlying diagnoses (%)   
   Rheumatoid arthritis/ othera Inflammatory arthritis conditions 4 4
   Osteoarthritis 94 93
   Other 2 3
  1. ASA, American Society of Anesthesiologists. aOther includes avascular necrosis, fracture, neoplasms, Paget's disease, septic arthritis, etcetera.