The Cox model is better than the Fine and Gray model when estimating relative revision risks from arthroplasty register data

Figures & data

True (simulated) and estimated values when comparing the revision-free survival of 2 different hypothetical prostheses types and including age and sex in the analysis

Variable	RR	95% CI
Values used in the simulation
Prosthesis	2	–
Age	1	–
Sex	1	–
Estimated values using a Cox model
Prosthesis	2.05	2.01–2.08
Age	1.00	1.00–1.00
Sex	1.00	0.98–1.02
Estimated values using a Fine and Gray model
Prosthesis	2.03	2.00–2.07
Age	0.99	0.99–0.99
Sex	0.86	0.85–0.87