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