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Table 5 Example of sample size calculation for the joint test under PH

From: An approach to trial design and analysis in the era of non-proportional hazards of the treatment effect

Power of test under PH Target HR Sample size
Logrank Joint   n events
0.8 0.709 0.70 378 248
   0.75 570 380
   0.80 931 632
0.9 0.835 0.70 506 332
   0.75 763 509
   0.80 1246 845
0.874 0.8 0.70 464 304
   0.75 700 467
   0.80 1142 775
0.945 0.9 0.70 610 399
   0.75 919 613
   0.80 1500 1018
  1. The power for the logrank test is given in the first column. The corresponding power of the joint test is shown in the second column.