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Table 1 Comparison of cases † and controls* regarding matching criteria (univariate analysis with conditional logistic regression)

From: Risk factors for total joint arthroplasty infection in patients receiving tumor necrosis factor α-blockers: a case-control study

  Cases † (n= 20) Controls* (n= 40) P
Age (years) ** 57.3 ± 12.4 57.5 ± 10.9 0.89
RA/PsA/AS, n 18/1/1 38/0/2 0.99
Rheumatic disorder duration (years) ** 20.4 ± 9.4 20.3 ± 8.5 0.97
TJA infection localization for cases, and matched TJA localization for controls, n (%)    
- Hip 5 (25) 10 (25) 1
- Knee 12 (60) 24 (60) 1
- Ankle 1 (5) 2 (5) 1
- Shoulder 2 (10) 4 (10) 1
  1. † at the time of diagnosis of TJA infection; * time chosen for a best matching; ** mean ± standard deviation.
  2. AS, ankylosing spondylitis; PsA, psoriatic arthritis; RA, rheumatoid arthritis; TJA, total joint arthroplasty.