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Table 3 (a) Hazard ratios of the risk factors associated with death from cause-specific hazard model based on multivariate Cox’s model, (b) subdistribution hazard ratio of the risk factors associated with the first reoperation, and (c) readmission based on multivariate Fine and Gray’s (subdistribution hazard ratio, sub-HR) model from competing risk analysis

From: Mortality, readmission, and reoperation after hip fracture in nonagenarians

   (a) Death (b) Reoperation (c) Readmission
HR (95%C.I.) p-value sub-HR (95%C.I.) p-value sub-HR (95%C.I.) p-value
Age Year 1.015 (1.012–1.019) <0.001 0.98 (0.95–0.99) 0.041 1.02 (1.01–1.03) 0.003
Gender Female (REF)    (REF)    (REF)   
Male 1.31 (1.26–1.37) <0.001 0.92 (0.82–1.04) 0.182 1.71 (1.59–1.84) <0.001
Fracture Cervical (REF)    (REF)    (REF)   
Trochanteric 1.14 (1.06–1.23) <0.001 0.72 (0.59–0.89) 0.002 1.08 (0.95–1.22) 0.257
Operation Fixation (REF)    (REF)    (REF)   
Hemiarthroplasty 1.03 (0.96–1.11) 0.371 0.96 (0.78–1.18) 0.665 1.00 (0.88–1.14) 0.998
CCIa 0 (REF)    (REF)    (REF)   
1 1.12 (1.06–1.18) <0.001 0.94 (0.82–1.08) 0.383 2.63 (2.37–2.91) <0.001
2 1.20 (1.13–1.28) <0.001 0.97 (0.82–1.14) 0.698 3.02 (2.71–3.37) <0.001
3 1.30 (1.20–1.40) <0.001 1.06 (0.87–1.29) 0.570 3.39 (2.99–3.85) <0.001
4 1.55 (1.45–1.66) <0.001 0.80 (0.65–0.97) 0.025 3.60 (3.15–4.13) <0.001
  1. aCharlson Comorbidity Index