Table 2.

Results of meta-regression for efficacy^*

Variable	β	P
DFS
Median follow-up	–0.509	.302
Age	–0.068	.898
Premenopausal	–0.753	.247
T > 2 cm	–0.895	.295
Grade 3	0.029	.971
OS
Median follow-up	–0.596	.212
Age	0.028	.958
Premenopausal	–0.608	.392
T > 2 cm	–0.994	.071
Grade 3	0.320	.680

^*DFS = disease-free survival; ER = estrogen receptor; OS = overall survival; T = tumor size.