. 2003 Dec;38(6 Pt 1):1385–1402. doi: 10.1111/j.1475-6773.2003.00184.x

Table 1.

Comparison of Patient Characteristics across ESBC Stage II Patients in Iowa Grouped by Treatment and Instruments, 1989–1994

			Treatment		Area BCSI Percentage^a		Radiation Distance^b

Full Sample	MAS	BCSI	Lower	Greater	Far	Near
BCSI (%)		9.7	0.0	100.0	7.3^***	12.1	6.5^***	13.0
Age (%)	<65	50.1	48.0^***	69.3	48.5^*	51.6	44.7^***	55.4
	65–74	24.4	24.7	21.6	24.7	24.1	25.8^*	23.0
	75+	25.5	27.3^***	9.2	26.8	24.3	29.5^***	21.7
Tumor Size (%)	T1 (2cm)	28.5	27.3^***	39.6	29.4	27.7	28.7	28.4
	T2 (2–5 cm)	68.7	69.7^***	59.7	67.9	69.6	68.9	68.6
	T3 (>5cm)	2.8	3.0^**	0.7	2.8	2.8	2.5	3.1
Positive Nodes (%)		59.2	59.2	60.1	59.4	59.2	59.2	59.4
Stage IIB (%)		33.6	34.9^***	21.2	32.8	34.3	33.0	34.1
Grade (%)	1	3.6	3.5	5.3	2.6^***	4.7	3.5	3.8
	2	20.9	20.6	24.0	16.7^***	25.0	22.4^**	19.4
	3	32.4	32.4	32.5	31.3	33.5	32.1	32.7
	4	6.4	6.6	4.6	8.4^***	4.4	8.7^***	4.1
	9 (unknown)	36.7	37.0	33.6	41.1^***	32.7	33.3^***	40.0
Charlson Comorbidity Index >0 (%)^c		20.4	21.4^***	11.3	19.5	21.3	21.4	19.4
Number of Patients in Group		2,905	2,622	283	1,437	1,468	1,445	1,460

^***

Statistically different rate across groups at .99 confidence.

^**

Statistically different rate across groups at .95 confidence.

Statistically different rate across groups at .90 confidence.

Patient in “less” group if less then 20% of all ESBC surgeries (stage I and II) in the 50-mile radius around the patient's residence in the year of diagnosis were BCS;

Patient in “near” group if distance to radiation treatment center in year of diagnosis is less than 19 miles.;

Modified Charlson comorbidity indices developed by mapping Clinical Classifications Software (CCS) diagnosis and procedure groups available on each HCUP discharge abstract into Charlson index groups.