Table 1.

Sample Characteristics of 9,932 Women aged 80 and Older with Estrogen Receptor Positive Tumors, 5 Centimeters or Less, with No Known Positive Lymph Nodes.

	n	%
Age
80–84	5,779	58.2
85–89	2,951	29.7
90+	1,202	12.1
Race/Ethnicity
Non-Hispanic White	9,152	92.2
Non-Hispanic Black	362	3.6
Hispanic	79	0.8
Asian	169	1.7
Other	107	1.1
Unknown	63	0.6
Year of diagnosis
92–95	2,608	26.3
96–00	3,574	36.0
01–05	3,750	37.8
Metropolitan status of residence
Metropolitan	8,902	89.6
Non-metropolitan	1,030	10.4
Marital status
Not married	7,228	72.8
Married	2,371	23.9
Unknown	333	3.4
Median income for area of residence
Lowest Quintile	1,900	19.1
2nd Quintile	1,997	20.1
3rd Quintile	2,082	21.0
4th Quintile	1,971	19.8
5th Quintile	1,937	19.5
Unknown	45	0.5
Quintiles of education (<12 years) for adults ≥25 in area of residence
Lowest Quintile	1,832	18.5
2nd Quintile	1,922	19.4
3rd Quintile	2,011	20.3
4th Quintile	2,077	20.9
5th Quintile	2,045	20.6
Unknown	45	0.5
Mammography use in the past 2 years
Non-users	3,810	38.4
Screeners	4,237	42.7
Peri-diagnosis mammogram	1,411	14.2
Other	474	4.8
SEER registry
Connecticut	1,505	15.2
San Francisco	829	8.4
Detroit	1,204	12.1
Hawaii	153	1.5
Iowa	1,870	18.8
New Mexico	310	3.1
Seattle	1,302	13.1
Utah	485	4.9
Atlanta	547	5.5
San Jose	395	4.0
Los Angeles	1,332	13.4
Stage
Stage I	6,141	61.8
Stage II	2,093	21.1
Unknown	1,698	17.1
Tumor Size
≤1 cm	3,605	36.3
1– ≤2 cm	4,037	40.7
2– ≤5 cm	2,290	23.1
Histology
Ductal	7,689	77.4
Lobular	811	8.2
Mucinous	699	7.0
Other	684	6.9
Unknown	49	0.5
Tumor Grade
Well differentiated, 1	2,561	25.8
Moderately differentiated, 2	4,354	43.8
Poorly differentiated, 3	1,933	19.5
Undifferentiated, 4	125	1.3
Unknown	959	9.6
Lymph Nodes
None positive	8,278	83.4
None examined