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Table 2 Method reporting in 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 %
Assessment of proportional hazards (PH)
 Yes 127 40
 No 191 60
PH testing method used
 Log(−log) 59 46
 Schoenfeld residuals 42 33
 Log of time 15 12
 Graphical evaluation of KM curve 10 8
 Score process test 1 1
Result of the PH testing state 51 40
PH violation stated 46 36
PH violation addressed in analysis 41 89
 Time axis division 30 73
 Time dependent coefficients 7 17
 stratified analysis 4 10