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Table 1 Selected characteristics of the study participants who underwent primary unilateral total knee arthroplasty (n = 138)

From: Determinants of pain, functional limitations and health-related quality of life six months after total knee arthroplasty: results from a prospective cohort study

Variables n (%) Mean (SD) Variables n (%) Mean (SD)
Demographics    Clinical characteristics   
 Age (years)   67 (9.3)  Diagnosis   
      Osteoarthritis 133 (96)  
 Gender      Rheumatoid arthritis 5 (4)  
  Female 91 (66)    BMI (kg/m2)   31.2 (6.2)
 Marital status     Comorbidities ( /56)   6.5 (2.2)
  Single, separated, divorced or widowed 51 (37)    Duration of knee symptoms before enrolment (years) § (years)   8.2 (8.3)
  Married or common law 87 (63)    Contralateral knee pain 100 (72)  
     Use of a walking aid before surgery 52 (38)  
 Living alone 33 (24)   Surgical characteristics   
     Implant type   
Socioeconomic characteristics      Postero-stabilized 108 (78)  
 Educational level (part or complete)      Cruciate retaining 30 (22)  
  High school or less 77 (56)    Implant fixation   
  College or university 61 (44)     Cementless 4 (3)  
 Employment status      Hybrid 2 (1)  
  Unemployed or retired 108 (78)     Cemented 132 (96)  
  Employed 30 (22)    Implant bearing type   
 Household income *      Mobile 4 (3)  
  < $30 000 / year 48 (35)     Fixed 134 (97)  
  $30 000 - $59 999/ year 42 (30)    Patella resurfacing 129 (93)  
  ≥ $60 000/ year 32 (23)    Number of in-hospital complications   
      0 103 (77)  
Psychosocial characteristics      1 34 (24)  
 Psychological distress (/42)   7.1 (6.3)   ≥2 9 (7)  
 Social support    Health services utilization   
  Low 66 (48)    Hospital length of stay (days)   7.1 (2.9)
  High 72 (52)    Discharged directly home 120 (87)  
     Post-surgery community physiotherapy(hours)   14.7 (18.3)
  1. *n = 125 – CND $.
  2. Social support was dichotomized around the median score: Low (≤ 80) and High (>80).
  3. Body mass index.
  4. § n = 132.
  5. WOMAC pain score at enrolment on pre-surgery wait list dichotomized into presence or absence of contralateral knee pain.
  6. In-hospital complications: wound infection (n = 5), implant infection (n = 4), fracture or dislocation (n = 3), knee ankylosis and manipulation (n = 4), cardiovascular/pulmonary/ circulatory complications (n = 12), peripheral/central nervous system involvement (n = 9), urinary infection (n = 3), acute confusion (n = 1), tendon and ligament rupture (n = 1) or blood transfusion (n = 14).