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Table 1 Reported characteristics of the trials

From: Are non-constant rates and non-proportional treatment effects accounted for in the design and analysis of randomised controlled trials? A review of current practice

Reported trial characteristic N (%)
Sample size calculation approach
  Log rank test 40 (61%)
Cox model beta coefficient 4 (6%)
Exponentially distributed survival 4 (6%)
Simulation 7 (11%)
Difference in proportions 6 (9%)
Unclear 5 (6%)
Time-to-event analytical methodsa
  Non-parametric log rank test 58 (88%)
Cox PH model 64 (97%)
Parametric regression 7 (11%)
Landmark analysis 7 (11%)
Proportional hazards (PH) assumptionb
  PH assumption acknowledged 34 (53%)
PH testing methods documented 31 (48%)
  Analytical test methods 10 (16%)
Visual assessment methods 6 (9%)
Visual and analytical methods 7 (11%)
Unspecified 8 (13%)
  1. aTrials typically presented more than one analytical method
  2. bfor the 64 studies where Cox PH model used