Table 1:
Characteristics | Patients cared for in networks performing SBRT* | Patients cared for in networks not performing SBRT | P value** |
---|---|---|---|
Number of patients | 3437 | 39,526 | |
Age, years (%) | 0.07 | ||
66–69 | 940 (27.3) | 10,448 (26.4) | |
70–74 | 1218 (35.4) | 13,817 (35.0) | |
75–79 | 813 (23.7) | 9239 (23.4) | |
80 or older | 466 (13.6) | 6022 (15.2) | |
Race/ethnicity (%) | <0.001 | ||
White | 2801 (81.5) | 32,660 (82.6) | |
Black | 442 (12.9) | 4020 (10.2) | |
Hispanic | 37 (1.1) | 725 (1.8) | |
Asian | 73 (2.1) | 938 (2.4) | |
Other | 84 (2.4) | 1183 (3.0) | |
Marital Status (%) | <0.001 | ||
Married | 2424 (70.5) | 26,412 (66.8) | |
Not married | 673 (19.6) | 6800 (17.2) | |
Unknown | 340 (9.9) | 6314 (16.0) | |
Comorbidity (%) | 0.45 | ||
0 | 2126 (61.9) | 24,757 (62.6) | |
1 | 795 (23.1) | 9157 (23.2) | |
2 or more | 497 (14.5) | 5445 (13.8) | |
Unknown | 19 (0.6) | 167 (0.4) | |
Tumor stage (%) | <0.001 | ||
T1 or less | 2059 (59.9) | 22,797 (57.7) | |
T2 | 1153 (33.5) | 14,594 (36.9) | |
T3/T4 | 125 (3.6) | 958 (2.4) | |
Unknown | 100 (2.9) | 1177 (3.0) | |
Disease risk classification (%) | 0.06 | ||
Lower | 947 (27.6) | 11,490 (29.1) | |
Higher | 2490 (72.4) | 28,036 (70.9) | |
Population of county of residence (%) | <0.001 | ||
1 million or more | 2207 (64.2) | 21,182 (53.6) | |
250,000–999,999 | 727 (21.2) | 7541 (19.1) | |
250,000 or less | 503 (14.6) | 10,775 (27.3) | |
Unknown | -- | 28 (0.1) | |
At least a high school education in ZIP code of residence (%) | <0.001 | ||
Low (0–75) | 292 (8.5) | 4687 (11.9) | |
High (>75) | 3079 (89.6) | 33,934 (85.9) | |
Unknown | 66 (1.9) | 905 (2.3) | |
Median household income in ZIP code of residence, $ (%) | <0.001 | ||
40,000 or less | 411 (12.0) | 6355 (16.1) | |
40,001–60,000 | 819 (23.8) | 14,006 (35.4) | |
60,001 or more | 2141 (62.3) | 18,213 (46.1) | |
Unknown | 66 (1.9) | 952 (2.4) | |
Geographic region (%) | <0.001 | ||
Northeast | 1553 (45.2) | 7570 (19.2) | |
South | 540 (15.7) | 9363 (23.7) | |
Central | 184 (5.4) | 7440 (18.8) | |
West | 1160 (33.8) | 15,153 (38.3) | |
Year of diagnosis (%) | <0.001 | ||
2007 | 308 (9.0) | 9148 (23.1) | |
2008 | 566 (16.5) | 8263 (20.9) | |
2009 | 758 (22.1) | 7699 (19.5) | |
2010 | 854 (24.8) | 7270 (18.4) | |
2011 | 951 (27.7) | 7146 (18.1) | |
Treatment (%) | <0.001 | ||
SBRT | 535 (15.6) | -- | |
IMRT | 1230 (35.8) | 11,922 (30.2) | |
Robotic prostatectomy | 363 (10.6) | 6013 (15.2) | |
Radical prostatectomy | 189 (5.5) | 2435 (6.2) | |
Brachytherapy | 363 (10.6) | 7967 (20.2) | |
Active surveillance | 456 (13.3) | 5598 (14.2) | |
Other treatments*** | 301 (8.8) | 5591 (14.1) |
Abbreviations: IMRT, intensity-modulated radiation therapy; SBRT, stereotactic body radiation therapy
Percentages might not sum to 100 because of rounding
Once a network performed SBRT, all patients in that network were cared for in “a network performing SBRT” from that year until the end of the study period. Patients treated in networks prior to the year of SBRT adoption were cared for in “a network not performing SBRT”.
P values generated from chi-square tests
Other treatments include external beam radiotherapy, proton beam therapy, perineal prostatectomy, hormonal therapy, and cryotherapy