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Table 1 Demographic and clinical characteristics of study patients

From: 26Postoperative diagnosis and outcome in patients with revision arthroplasty for aseptic loosening

Characteristic Aseptic loosening (n = 174) PJI (n = 24) P a
Age (year)-mean (SD) 69.5 (12.0) 68.2 (14.1) 0.61
Gender- no. (%)    
  Male 72 (41.4) 14 (58.3) 0.13
Body mass index-mean (SD) 30.8 (4.8) 30.6 (6.1) 0.84
Location    
  Hip 118(67.8) 23(95.8) 0.003
  Knee 56 (32.2) 1(4.2)  
Surgical procedure-no. (%)a    
  Partial Revision 99 (56.9) 19 (79.1) 0.045
  Total Revision (One-stage exchange) 73 (42.0) 4 (16.7)  
  Two-stage revision 1 (0.6) 0  
  Girdlestone 1 (0.6) 1(4.2)  
Underlying joint disorder-no (%)    
  Osteoarthritis 6 (3.4) 0 1.00
  Osteoarthrosis 14 (8.0) 4 (16.7) 0.24
  Osteoporosis 19 (10.9) 4 (16.7) 0.49
  Rheumatoid arthritis 7 (4.0) 0 1.00
  Acute fracture/trauma 9 (5.2) 1(4.2) 1.00
  Malignancy 3 (1.7) 0 1.00
Associated conditions- no. (%)    
  Diabetes mellitus 25 (14.4) 5 (20.8) 0.38
  Immunosuppressive therapy 6 (3.4) 0 1.00
  Systemic steroid therapy 6 (3.4) 0 1.00
  Prior revision arthroplasty 34 (19.5) 8 (33.3) 0.18
Time between last implantation and removal of implant-no. (%)    
  ≤30 days 1 (0.6) 1 (4.2) 0.12
  31– 365 days 15 (8.6) 5 (20.8)  
  366 days-5 years 51 (29.3) 6 (25.0)  
  6-10 years 32 (18.4) 5 (20.8)  
  11-15 years 31 (17.8) 5 (20.8)  
  >15 years 44 (25.3) 2 (8.3)  
Blood units after surgery-no. (%) 32 (18.4) 8 (33.3) 0.11
Length of surgery (minutes)- 152.6 (70.7) 173.8 (93.9) 0.20392
Mean (SD)    393
  1. PJI Prosthetic joint infection; SD Standard Deviation
  2. aTwo-tailed Chi-squared or Fisher exact test for categorical variables or t-test for continuous variables