Table 1.
Population-Weighted Sample Characteristics by Race and Lymph Node Status
| Full Sample | Node Positive | Node Negative | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Characteristic | Non-Black | Black | P | Non-Black | Black | P | Non-Black | Black | P |
| N | 859 | 609 | 203 | 180 | 656 | 429 | |||
| Weighted N | 3,895 | 793 | 828 | 218 | 3,067 | 574 | |||
| ODX testing | |||||||||
| Assay included | 43.2 | 33.9 | .001 | 34 | 14.4 | < .001 | 45.7 | 41.4 | .23 |
| Recurrence score | 17.7 (8.3) | 19 (16.2) | .17 | 18.0 (6.4) | 19.2 (13.9) | .61 | 17.7 (8.7) | 19.0 (16.7) | .2 |
| Tumor | |||||||||
| Stage I v II | 65.9 | 55.3 | < .001 | 11.6 | 7 | .16 | 80.6 | 73.7 | .02 |
| Size, cm | < .001 | .22 | .01 | ||||||
| < 2 | 75.5 | 65.9 | 54.8 | 45.5 | 81 | 73.7 | |||
| 2-5 | 22.4 | 32.3 | 43.5 | 53.3 | 16.8 | 24.3 | |||
| > 5 | 2.1 | 1.8 | 1.7 | 1.2 | 2.2 | 2 | |||
| Grade | < .001 | .003 | .004 | ||||||
| 1 | 38.4 | 27.9 | 29.5 | 18.2 | 40.8 | 31.6 | |||
| 2 | 46 | 47.2 | 48.8 | 43.8 | 45.2 | 48.5 | |||
| 3 | 15.6 | 24.9 | 21.7 | 38 | 13.9 | 20 | |||
| PR positive | 89.9 | 80.8 | < .001 | 92.5 | 80.2 | .004 | 89.2 | 81 | < .001 |
| Treatment | |||||||||
| Start ET | 90.7 | 87.1 | .06 | 93.7 | 88.2 | .08 | 89.8 | 86.7 | .15 |
| Start adjuvant CT | 27.5 | 36.7 | < .001 | 56.6 | 66.1 | .09 | 19.6 | 25.5 | .03 |
| Radiation therapy | 68.1 | 68 | .97 | 71.3 | 76.3 | .3 | 67.3 | 64.9 | .49 |
| Lumpectomy* | 62.9 | 61.9 | 49.4 | 49.2 | .97 | 66.5 | 66.7 | .13 | |
| Clinical | |||||||||
| Age at diagnosis, years | 57.7 (8.7) | 55.5 (16.9) | .003 | 56.0 (9.2) | 52.6 (15.0) | < .001 | 58.2 (8.6) | 56.6 (17.2) | .04 |
| Diagnosis year | .49 | .41 | .49 | ||||||
| 2008 | 11.2 | 10.9 | 14.8 | 14.5 | 10.2 | 9.6 | |||
| 2009 | 19.4 | 19.2 | 15.7 | 22.6 | 20.4 | 17.9 | |||
| 2010 | 24.3 | 23 | 19.9 | 19.7 | 25.5 | 24.3 | |||
| 2011 | 23.7 | 28 | 26.4 | 27.3 | 23 | 28.3 | |||
| 2012 or 2013 | 21.4 | 18.8 | 23.2 | 12.2 | 20.9 | 20 | |||
| Comorbidities | |||||||||
| Diabetes | 11 | 25.7 | < .001 | 12.5 | 20.8 | .06 | 10.6 | 27.6 | < .001 |
| COPD | 3.6 | 3.4 | .87 | 3.8 | 3.2 | .77 | 3.6 | 3.5 | .97 |
| Obesity | 11 | 21.9 | < .001 | 10 | 19.5 | .02 | 11.3 | 22.8 | < .001 |
| Heart disease | 6.7 | 7.2 | .73 | 7.8 | 5.5 | .43 | 6.4 | 7.9 | .41 |
| Hypertension | 38.9 | 65.7 | < .001 | 39.4 | 61.4 | < .001 | 38.8 | 67.3 | < .001 |
| Socioeconomic | |||||||||
| Family income, $ | < .001 | < .001 | < .001 | ||||||
| < 15,000 | 7.1 | 25.1 | 8.2 | 30.7 | 6.8 | 23 | |||
| 15,000-30,000 | 12.3 | 25 | 9.4 | 29.6 | 13.1 | 23.3 | |||
| 30,000-50,000 | 17.1 | 19.3 | 18 | 15.7 | 16.8 | 20.6 | |||
| > 50,000 | 56.5 | 25.1 | 60.5 | 17.3 | 55.4 | 28.1 | |||
| Not reported | 7 | 5.4 | 3.9 | 6.7 | 7.9 | 4.9 | |||
| Insurance | |||||||||
| Private | 78.9 | 63.7 | < .001 | 78.7 | 57.2 | < .001 | 79 | 66 | < .001 |
| Medicaid | 6 | 23.5 | < .001 | 6.9 | 28.9 | < .001 | 5.8 | 21.6 | < .001 |
| Medicare | 35.4 | 37.4 | .51 | 28.7 | 32.8 | .47 | 37.2 | 39.1 | .61 |
| Uninsured | 2.9 | 9.7 | < .001 | 2.5 | 14.8 | < .001 | 3 | 7.7 | .001 |
| Married | 71.1 | 39.4 | < .001 | 73.8 | 34.2 | < .001 | 70.3 | 41.4 | < .001 |
| Employment | .12 | .16 | .35 | ||||||
| Unemployed | 53.9 | 58.7 | 50.9 | 61.2 | 54.7 | 57.7 | |||
| Employed | 45.4 | 39.9 | 47.7 | 36.8 | 44.8 | 41.1 | |||
| Not reported | 0.7 | 1.4 | 1.4 | 2 | 0.5 | 1.2 | |||
| Education | < .001 | < .001 | < .001 | ||||||
| HS | 49 | 55.9 | 39 | 60.9 | 51.7 | 54 | |||
| College or higher | 44.8 | 30.6 | 50.4 | 26.9 | 43.3 | 32 | |||
| Less than HS | 6.1 | 13.5 | 10.6 | 12.2 | 4.9 | 14 | |||
NOTE. Data are the mean with SE or percentage unless otherwise specified.
Abbreviations: COPD, chronic obstructive pulmonary disease; CT, chemotherapy; ET, endocrine therapy; HS, high school; ODX, Oncotype DX (Genomic Health, Redwood City, CA); PR, progesterone receptor.
*
Compared with mastectomy.