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Table 1 Baseline characteristics of the included studies

From: Testing the proportional hazards assumption in cox regression and dealing with possible non-proportionality in total joint arthroplasty research: methodological perspectives and review

  Included studies
n = 318 %
Study-design
 register-based 250 78
 cohort 15 5
 case series 51 16
 RCT 3 1
Number of participantsa 7170 29–3,700,000
Joint of interest
 hip 183 57
 knee 114 36
 both 21 7
Intervention studied
 prosthesis 170 54
 operation 65 20
 patient 55 17
 surgeon 8 3
 hospital 7 2
 medication 7 2
 antibiotics 6 2
Outcome measurement
 revision 300 94
 death 9 3
 complication 9 3
  1. amedian + range