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Table 1 Methods used to assess the PH assumption

From: Combined test versus logrank/Cox test in 50 randomised trials

Method of checking non-PH No. of studies
Treatment × time interaction (likelihood ratio test) 7
Schoenfeld residuals (graphical assessment) 4
Schoenfeld residuals (Grambsch–Therneau test) 1
Method not reported 2
No check done 36
Total 50
  1. PH proportional hazards