Table 4.

Comparison of the non-stratified and stratified log-rank type test for different covariate types: power

	62% events due to ex. haz.		93% events due to ex. haz.
	LRt	LRt-str	LRt	LRt-str
X∈D, bal (sex); S∉D, bal, bin	0.498	0.501	0.879	0.882
X∈D, bal (sex); S∉D, imbal, bin	0.508	0.510	0.872	0.874
X∈D, bal (sex); S∉D, bal, 10 str	0.501	0.498	0.875	0.878
X∈D, bal (sex); S∉D, bal, bin, NPH	0.514	0.520	0.887	0.893
X∉D, bal, bin; S∈D, bal, bin (sex)	0.483	0.489	0.872	0.875
X∈D, bal (sex); S∈D, (age; 3 str)	0.512	0.513	0.871	0.873

Methods included: non-stratified (LRt) and stratified log-rank type test (LRt-str). ((im)bal = (im)balanced variable, i.e., the groups occur with (un)equal probabilities; bin= binary variable; 10 str = 10 strata; NPH = nonproportional effect). X is the categorical covariate of interest, S the stratification covariate, D denotes the demographic variables