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. Author manuscript; available in PMC: 2013 Apr 29.

Published in final edited form as: AJR Am J Roentgenol. 2012 Aug;199(2):458–464. doi: 10.2214/AJR.10.6096

Table 4.

Clinical Characteristics: TN vs. NTN (n=207 for TN and 967 for NTN)

		TN	NTN	Chi-square

Age		Mean (SD): 51.2 (12.7) yrs. Range: 17–95 yrs.	Mean (SD): 55.9 (12.9) yrs. Range: 24–92 yrs.	< .0001

Grade^*	I	6 (3%)	220 (25%)	< .0001
	II	51 (26%)	490 (55%)
	III	138 (71%)	180 (20%)

Mode of Detection	Mammogram	66 (32%)	499 (52%)	<0.0001
Mode of Detection	Clinical detection^**	141 (68%)	468 (48%)	<0.0001

^*

Note: 12 TN and 76 NTN were unknown.

^**

By self and clinician performed breast exam, breast pain or nipple discharge