Table 1.

Differences in the distribution of patient- and tumor-associated factors between stage I-III and stage IV breast cancer

Total Number stratified	Stage I-III		Stage IV		P (Chi square)
	379,052		16,118
	Number	% in category	Number	% in category
Race
Caucasian	340,644	89.9	13,434	83.3	< .001
African American	38,408	10.1	2,684	16.7
Age grouping
< 40	23,257	6.1	1,116	6.9	< .001
40-69	257,169	67.9	10,320	64.0
≥ 70	98,626	26.0	4,682	29.0
Grade
1	72,103	19.0	1,051	6.5	< .001
2	162,700	42,9	6,335	39.3
3	144,249	38.1	8,732	54.2
ER Status
+	296,814	78.3	11,490	71.3	< .001
-	82,238	21.7	4,628	28.7
PR Status
+	257,815	68.0	9,289	57.6	< .001
-	121,237	32.0	6,829	42.4
Marital Status
Single	49,219	13.0	3.101	19.2	< .001
Married	224,023	59.1	7,587	47.1
Separated	3,567	0.9	222	1.4
Divorced	41,855	11.0	2,041	12.7
Widowed	60,388	15.9	3,167	19.6
Laterality
Right	186,765	49.3	7,892	49.0	0.44
Left	192,287	50.7	8,226	51.0