Table 4

HRs and associated 95% CIs from the univariable and multivariable Cox regression models for all-cause revision

Univariable modelsMultivariable model
HR (95% CI)P valueHR (95% CI)P value
Tourniquet used
 No1.000.311.000.29
 Yes0.83 (0.57 to 1.20)0.82 (0.57 to 1.18)
Age at primary surgery (years)0.17 (0.11 to 0.27)
 <651.00<0.0011.00<0.001
 65–690.75 (0.60 to 0.94)0.74 (0.60 to 0.93)
 70–790.41 (0.33 to 0.50)0.40 (0.32 to 0.49)
 >800.18 (0.11 to 0.27)0.17 (0.11 to 0.27)
Patient gender
 Female1.000.031.00.21
 Male1.21 (1.01 to 1.43)1.12 (0.94 to 1.33)
Primary ASA score, n (%)
 P11.000.391.000.19
 P20.90 (0.74 to 1.10)1.08 (0.89 to 1.31)
 P31.13 (0.84 to 1.51)1.39 (1.04 to 1.87)
 P41.34 (0.19 to 9.54)1.61 (0.22 to 11.48)
  • ASA, American Society of Anaesthesiologists.