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Table 3 Cox regression analysis. Risk of revision due to deep infection for all TKA patients in four different procedure duration groups

From: Patient and surgical factors affecting procedure duration and revision risk due to deep infection in primary total knee arthroplasty

  Cox regressionc
Unadjusted Adjusted
Procedure duration No of TKA No of revisionsa K-M 1y %b K-M 4y %b HR (95% CI) p-value HR (95% CI) p-value
       0.01d   0.03d
<75 5680 48 0.60 0.89 1   1  
75-89 6238 54 0.58 0.85 1.1 (0.7 - 1.5) 1.0 1.0 (0.7 - 1.4) 0.9
90-109 8659 91 0.63 1.01 1.2 (0.9 – 1.7) 0.3 1.1 (0.8 – 1.6) 0.5
≥110 7685 118 0.91 1.38 1.8 (1.3 – 2.5) 0.001 1.5 (1.0 – 2.1) 0.03
  1. aNumber of revisions due to deep infection (n = 311)
  2. bKaplan-Meier estimated proportion of revisions due to deep infection at 1 and 4 years follow-up
  3. cUnadjusted and adjusted Hazard ratios (HR) estimated with the Cox proportional hazards model (adjusted for sex, age, diagnosis, ASA classification and perioperative complications
  4. dOverall test for group differences