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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: Cancer. 2019 Jul 8;125(19):3412–3417. doi: 10.1002/cncr.32207

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.