Table 3 Bootstrap-based Cox regression analyses1 of HTcurrent, showing inclusion frequencies2 (percent) in 1000 bootstrap samples and final selection (yes/no) according to pre-specified criteria.
| Predictor3 | LRFS (0–10 years, %) | |
|---|---|---|
| 1 There were no selection procedures for OS and DMFS because of non-significant results of the likelihood ratio tests comparing the base model with the full interaction model. 2 Inclusion frequency may be regarded as a measure of variable importance. 3 The other predictors of the full Cox model (i.e., ER, age, …, chemotherapy) were kept in all bootstrap samples. | ||
| HTcurrent | 100.0 | yes |
| HTcurrent × ER | 74.1 | yes |
| HTcurrent × age | 63.9 | no |
| HTcurrent × PR | 42.2 | no |
| HTcurrent × pN | 37.3 | no |
| HTcurrent × grading | 36.5 | no |
| HTcurrent × antihormonal therapy | 29.9 | no |
| HTcurrent × pT | 23.5 | no |
| HTcurrent × chemotherapy | 16.9 | no |