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Table 5 Comparison of the non-stratified and stratified log-rank type test for different effect sizes: power

From: On comparison of net survival curves

  62% events due to ex. haz. 93% events due to ex. haz.
  LRt LRt-str LRt LRt-str
XD, bal (sex); SD, bal, bin, ef 0 0.505 0.505 0.870 0.870
XD, bal (sex); SD, bal, bin, ef 2x 0.502 0.519 0.863 0.880
XD, bal (sex); SD, bal, bin, ef 5x 0.465 0.559 0.778 0.894
XD, bal (sex); SD, bal, 10str, ef 0 0.495 0.496 0.879 0.875
XD, bal (sex); SD, bal, 10str, ef 2x 0.486 0.499 0.862 0.878
XD, bal (sex); SD, bal, 10str, ef 5x 0.472 0.559 0.772 0.895
  1. Methods included: non-stratified (LRt) and stratified log-rank type test (LRt-str). (bal = balanced variable, i.e., the groups occur with equal probabilities; bin= binary variable; 10 str = 10 strata; ef= variable’s effect). X is the categorical covariate of interest, S the stratification covariate, D denotes the demographic variables