RT | Non-RT | Standardized difference | |||
---|---|---|---|---|---|
Characteristics | No | % | No | % | |
Patients | 2149 | 50.0 | 2149 | 50.0 | |
Age of diagnosis, years | |||||
Mean (SD) | 70 (11.9) | 71 (12.9) | 0.081 | ||
< 50 | 163 | 7.6 | 194 | 9.0 | 0.050 |
50–59 | 233 | 10.8 | 232 | 10.8 | 0.000 |
60–69 | 463 | 21.5 | 380 | 17.7 | 0.096 |
≥ 70 | 1290 | 60.0 | 1343 | 62.5 | 0.051 |
Era of diagnosis | |||||
1998–2004 | 792 | 36.9 | 731 | 34.0 | 0.061 |
2005–2009 | 585 | 27.2 | 673 | 31.3 | 0.090 |
2010–2015 | 772 | 35.9 | 745 | 35.3 | 0.011 |
Race | |||||
White | 1769 | 82.3 | 1782 | 82.9 | 0.015 |
Black | 186 | 8.7 | 202 | 9.4 | 0.026 |
Other | 194 | 9.0 | 165 | 7.7 | 0.047 |
Marital status | |||||
Married | 932 | 43.3 | 956 | 44.5 | 0.022 |
Non-married | 215 | 10.0 | 227 | 10.6 | 0.020 |
DSW | 902 | 42.0 | 880 | 40.9 | 0.022 |
Unknown | 100 | 4.7 | 86 | 4.0 | 0.033 |
Laterality | |||||
Left | 1124 | 52.3 | 1139 | 53.0 | 0.014 |
Right | 1025 | 47.7 | 1010 | 47.0 | 0.014 |
Tumor size (T stage), cm | |||||
Mean (SD) | 1.4 (0.7) | 1.4 (0.7) | 0.000 | ||
≤ 1.0 (T1) | 817 | 38.0 | 822 | 38.3 | 0.006 |
1.1–2.0 (T1) | 985 | 45.8 | 1009 | 47.0 | 0.024 |
2.1–3.0 (T2) | 347 | 16.1 | 318 | 14.8 | 0.036 |
Tumor grade | |||||
I | 1164 | 54.2 | 1212 | 56.4 | 0.044 |
II | 566 | 26.3 | 558 | 26.0 | 0.007 |
III | 45 | 2.1 | 46 | 2.1 | 0.000 |
IV | 4 | 0.2 | 4 | 0.2 | 0.000 |
unknown | 370 | 17.2 | 329 | 15.3 | 0.052 |
ER status | |||||
Positive | 1912 | 89.0 | 1952 | 90.8 | 0.060 |
Negative | 34 | 1.6 | 30 | 1.4 | 0.012 |
Unknown | 203 | 9.4 | 167 | 7.8 | 0.058 |
PR status | |||||
Positive | 1732 | 80.6 | 1754 | 81.6 | 0.027 |
Negative | 182 | 8.5 | 186 | 8.7 | 0.005 |
Unknown | 235 | 10.9 | 209 | 9.7 | 0.039 |
Chemotherapy | |||||
No/Unknown | 2019 | 94.0 | 2040 | 94.9 | 0.039 |
Yes | 130 | 6.0 | 109 | 5.1 | 0.039 |