Skip to main content

Table 6 Comparison of the non-stratified and stratified log-rank type test for different number of strata

From: On comparison of net survival curves

Length of age interval for stratification (no. of strata) Size Power
non-stratified 0.042 0.500
10 years (3 strata) 0.049 0.538
5 years (6 strata) 0.049 0.546
1 year (30 strata) 0.051 0.534
6 months (60 strata) 0.050 0.516
1 month (360 strata) 0.050 0.368
  1. XD (sex is the categorical covariate of interest), SD (age (grouped) is the stratification covariate)