Table 3:

Multivariable analysis for disease-free survival (DFS): NSABP B-42

Characteristic		No. of patients (N=3,903)	No. (%) of DFS events	Hazards ratio (95%CI)	P
Treatment	Placebo	1953	339 (17.4)	---	0.0501
	Letrozole	1950	292 (15.0)	0.86 (0.73,1.00)
Age	< 60	1344	163 (12.1)	---	<0.0001
	≥60	2559	468 (18.3)	1.55 (1.29,1.86)
Pathologic Nodal Status	Negative	2240	322 (14.4)	---	0.0005
	Positive	1663	309 (18.6)	1.33 (1.13,1.56)
Received Tamoxifen	No	2377	421 (17.7)	---	0.0035
	Yes	1526	210 (13.8)	0.78 (0.66,0.92)
Surgery Type	Lumpectomy	2374	348 (14.7)	---	0.0098
	Mastectomy	1529	283 (18.5)	1.24 (1.05,1.45)