Table 2.

Differences in Frequencies of Age, Race, and Stage for Other Breast Cancers and Triple Negative Breast Cancer

	Other BC n=1054975		TNBC n=96749		Test for Difference
Variable	N	Percent	N	Percent	statistic	p
Race					χ2=9851.15	<.0001
NHW	798626	75.70	63579	65.72
Hispanic	87069	8.25	8438	8.72
NHB	114663	10.87	20726	21.42
AI/AN	5002	0.47	502	0.52
Asian	41382	3.92	3042	3.14
Other	8233	0.78	462	0.48
Age Groups					χ2=5051.62	<.0001
<40	39855	3.78	7474	7.73
40–49	162650	15.42	17065	17.64
50–64	395805	37.52	37993	39.27
65–74	256176	24.28	19806	20.47
75+	200489	19.00	14411	14.90
Mean Age†		62.07		59.28	t=59.86	<.0001
Late Stage					χ2=7182.29	<.0001
Yes	273929	25.97	36659	37.89
No	752341	71.31	59292	61.28
Distant Stage					χ2=2311.43	<.0001
Yes	47661	4.52	6412	6.63
No	978609	92.76	89539	92.55
Missing‡	28705	2.72	798	0.82

^†Satterthwaite T-test used to compare mean age differences (F=1.08, p<.0001 test for equal variance). Percent is the mean age for each group.

^‡This represents the number of cases that were missing stage data.