Table 1.
Baseline Demographic Characteristics for the IMRT vs CRT Comparison
| No. (%) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Before Propensity Weighting | After Propensity Weighting | |||||||
| Characteristics | IMRT (n = 6666) |
CRT (n = 6310) |
P Value |
IMRT (n = 6438) |
CRT (n = 6478) |
P Value |
||
| Year of radiation | ||||||||
| 2002 | 448 (6.7) | 2402 (38.1) |  |
<.001 | 1203 (18.7) | 1380 (21.3) | |
<.001 |
| 2003 | 917 (13.8) | 1846 (29.3) | 1431 (22.2) | 1340 (20.7) | ||||
| 2004 | 1334 (20.0) | 1149 (18.2) | 1287 (20.0) | 1193 (18.4) | ||||
| 2005 | 1841 (27.6) | 601 (9.5) | 1261 (19.6) | 1214 (18.7) | ||||
| 2006 | 2126 (31.9) | 312 (4.9) | 1256 (19.5) | 1351 (20.9) | ||||
| Age at diagnosis, y | ||||||||
| 66–69 | 1338 (20.1) | 1265 (20.1) |  |
.50 | 1341 (20.8) | 1306 (20.2) | |
.59 |
| 70–74 | 2415 (36.2) | 2345 (37.2) | 2353 (36.6) | 2368 (36.5) | ||||
| ≥75 | 2913 (43.7) | 2700 (42.8) | 2743 (42.6) | 2804 (43.3) | ||||
| Race | ||||||||
| White | 5694 (85.4) | 5325 (84.4) | |
<.001 | 5436 (84.5) | 5443 (84.0) | |
.45 |
| Black | 521 (7.8) | 657 (10.4) | 586 (9.1) | 630 (9.7) | ||||
| Other/unknown | 451 (6.8) | 328 (5.2) | 415 (6.4) | 405 (6.3) | ||||
| SEER region | ||||||||
| Atlanta and rural Georgia | 121 (1.8) | 126 (2.0) |  |
<.001 | 129 (2.0) | 130 (2.0) | |
.06 |
| California | 2195 (32.9) | 1546 (24.5) | 2038 (31.7) | 2024 (31.2) | ||||
| Connecticut | 661 (9.9) | 608 (9.6) | 592 (9.2) | 562 (8.7) | ||||
| Detroit | 437 (6.6) | 849 (13.5) | 541 (8.4) | 602 (9.3) | ||||
| Hawaii | 143 (2.2) | 71 (1.1) | 105 (1.6) | 80 (1.2) | ||||
| Iowa | 345 (5.2) | 646 (10.2) | 501 (7.8) | 488 (7.5) | ||||
| Kentucky | 322 (4.8) | 682 (10.8) | 405 (6.3) | 462 (7.1) | ||||
| Louisiana | 489 (7.3) | 340 (5.4) | 452 (7.0) | 464 (7.2) | ||||
| New Jersey | 1415 (21.2) | 788 (12.5) | 1122 (17.4) | 1099 (17.0) | ||||
| New Mexico | 287 (4.3) | 178 (2.8) | 228 (3.5) | 226 (3.5) | ||||
| Seattle | 205 (3.1) | 368 (5.8) | 222 (3.4) | 265 (4.1) | ||||
| Utah | 46 (0.7) | 108 (1.7) | 103 (1.6) | 78 (1.2) | ||||
| Marital status | ||||||||
| Married | 4733 (71.0) | 4465 (70.8) | |
.02 | 4513 (70.1) | 4570 (70.6) | |
.68 |
| Not married | 1308 (19.6) | 1323 (21.0) | 1341 (20.8) | 1347 (20.8) | ||||
| Missing/unknown | 625 (9.4) | 522 (8.3) | 584 (9.1) | 560 (8.6) | ||||
| Census income, % | ||||||||
| Low income (0–25) | 1545 (23.2) | 1840 (29.2) |  |
<.001 | 1718 (26.7) | 1716 (26.5) | |
.95 |
| Low-medium income (26–50) | 1648 (24.7) | 1696 (26.9) | 1652 (25.7) | 1662 (25.7) | ||||
| Medium-high income (51–75) | 1698 (25.5) | 1481 (23.5) | 1582 (24.6) | 1579 (24.4) | ||||
| High income (>75) | 1775 (26.6) | 1293 (20.5) | 1485 (23.1) | 1521 (23.5) | ||||
| Census proportion with at least high school education, % |
||||||||
| Low education (0–25) | 1461 (21.9) | 1862 (29.5) | |
<.001 | 1690 (26.3) | 1680 (25.9) | |
.90 |
| Low-medium education (26–50) | 1579 (23.7) | 1606 (25.5) | 1576 (24.5) | 1589 (24.5) | ||||
| Medium-high education (51–75) | 1799 (27.0) | 1547 (24.5) | 1637 (25.4) | 1682 (26.0) | ||||
| High education (>75) | 1827 (27.4) | 1295 (20.5) | 1535 (23.8) | 1526 (23.6) | ||||
| Population density | ||||||||
| Metropolitan | 5750 (86.3) | 5024 (79.6) |  |
<.001 | 5339 (82.9) | 5380 (83.0) | |
.86 |
| Nonmetropolitan | 916 (13.7) | 1286 (20.4) | 1099 (17.1) | 1098 (17.0) | ||||
| RTOG affiliation | 917 (13.8) | 740 (11.7) | <.001 | 852 (13.2) | 825 (12.7) | .40 | ||
Abbreviations: CRT, conformal radiation therapy; IMRT, intensity-modulated radiation therapy; RTOG, Radiation Therapy Oncology Group; SEER, Surveillance, Epidemiology, and End Results.