Table 2.

Predictor variables

Categorical variables	Number of distinct values
Race	18
Marital status	5
Primary site code	8
Histology	55
Behavior	2
Grade	4
Extension of tumor	8
Lymph node involvement	9
Radiation	8
Stage	4
Site specific surgery code	40
ERStatus	4
PRStatus	4
Continuous variables	Mean	SD*	Range
Age	59.4	13.5	17-103
Tumor size	18.3	18.2	0-555
Number of positive nodes	1.1	3	0-45
Number of nodes	6.2	7.6	0-90
Number of primaries	1.3	0.6	1-6

^*Standard deviation.