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Table 1 Characteristics of the study participants at enrolment on the waiting lists for total knee replacement (n = 197)

From: Waiting for total knee replacement surgery: factors associated with pain, stiffness, function and quality of life

Variables n (%) Mean (SD)
Demographics   
   Age (years)   67 (9.8)
   Gender   
Female 126 (64)  
Male 71 (36)  
   Marital status   
Single, separated, divorced or widowed 72 (37)  
Married or common law 125 (63)  
   Living situation   
Living alone 45 (23)  
Not living alone 152 (77)  
Clinical characteristics   
   BMI* (kg/m2)   31.0 (6.3)
   Comorbidities** (/56)   6.2 (2.3)
   Duration of symptoms (years)   8.5 (8.8)
   Contralateral knee pain   
Yes 53 (27)  
No 144 (73)  
   Use of a walking aid   
Yes 74 (38)  
No 123 (62)  
Socioeconomic characteristics   
   Educational level (part or complete)   
High school or less 112 (57)  
College or university 85 (43)  
   Employment status   
Retired 128 (65)  
Employed 39 (20)  
Not working or sickness benefit 30 (15)  
   Household income   
< $30 000/year 61 (36)  
≥ $30 000/year 107 (64)  
Psychosocial characteristics   
   Psychological distress (/42)   6.9 (6.5)
   Social support §   
Low 92 (47)  
High 105(53)  
  1. * Body mass index
  2. ** Cumulative illness rating scale (CIRS); n = 177
  3. Established from the WOMAC pain score for the contralateral knee
  4. n = 168
  5. § Social support was dichotomized around the median score: Low (≤ 80) and High (> 80)