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. Author manuscript; available in PMC: 2016 Jan 31.

Published in final edited form as: Clin Breast Cancer. 2014 Aug 18;15(1):e27–e34. doi: 10.1016/j.clbc.2014.07.009

Table 1.

Patient and Breast Cancer Characteristics by Stage at Diagnosis, Iowa, 2010–2012

	AJCC Stage			P value^a
	T1aN0M0	T1bN0M0	All others (T1cN0, Stage II–III)	P value^a

N	519	1,168	4,416

Age at diagnosis				P<0.0001
≤39	5 (1.0%)	13 (1.1%)	208 (4.7%)
40–49	53 (10.2%)	96 (8.2%)	622 (14.1%)
≥50	461 (88.8%)	1,059 (90.7%)	3,586 (81.2%)

Tumor Grade				P<0.0001
Well diff	255 (49.1%)	498 (42.6%)	928 (21.0%)
Moderately diff	198 (38.2%)	469 (40.2%)	1,808 (41.0%)
Poorly diff	56 (10.8%)	184 (15.8%)	1,598 (36.2%)
Unknown	10 (1.9%)	17 (1.4%)	82 (1.8%)

Histology				P<0.0001
Ductal	447 (86.1)	1,023 (87.6%)	3,684 (83.4%)
Lobular	36 (6.9)	78 (6.7%)	485 (11.0%)
Other	36 (6.9)	67 (5.7%)	247 (5.6%)

Abbreviations: AJCC = American Joint Committee on Cancer; diff = differentiated

^a

Calculated using χ² test, “unknown” categories not included.