Table 1.
Clinical and demographic characteristics stratified by hospital volume.
| <2 | 2-3.99 | 4-5.99 | ≥6 | P-value | |||||
|---|---|---|---|---|---|---|---|---|---|
|
|
|||||||||
| N | (%) | N | (%) | N | (%) | N | (%) | ||
| Number of hospitals | 664 | 315 | 86 | 50 | |||||
| Patients | 4027 | 7237 | 4447 | 5055 | |||||
| Median (IQR) | 1.5 (1.3-1.7) | 2.8 (2.3-3.4) | 4.7 (4.3-5.4) | 8.7 (6.7-11.5) | |||||
| Year of diagnosis | <0.0001 | ||||||||
| 1998 | 309 | (21.8) | 492 | (34.8) | 333 | (23.5) | 281 | (19.9) | |
| 1999 | 264 | (21.2) | 410 | (32.9) | 288 | (23.1) | 284 | (22.8) | |
| 2000 | 238 | (21.7) | 393 | (35.8) | 223 | (20.3) | 243 | (22.2) | |
| 2001 | 221 | (20.6) | 397 | (36.9) | 209 | (19.4) | 248 | (23.1) | |
| 2002 | 155 | (26.2) | 201 | (34.0) | 115 | (19.4) | 121 | (20.4) | |
| 2003 | 350 | (20.8) | 575 | (34.2) | 366 | (21.8) | 391 | (23.3) | |
| 2004 | 317 | (18.6) | 614 | (36.1) | 341 | (20.0) | 430 | (25.3) | |
| 2005 | 294 | (17.9) | 582 | (35.4) | 369 | (22.5) | 399 | (24.3) | |
| 2006 | 298 | (18.5) | 567 | (35.1) | 363 | (22.5) | 387 | (24.0) | |
| 2007 | 288 | (16.5) | 608 | (34.8) | 374 | (21.4) | 478 | (27.4) | |
| 2008 | 319 | (18.6) | 582 | (33.9) | 379 | (22.1) | 437 | (25.5) | |
| 2009 | 312 | (17.9) | 598 | (34.3) | 384 | (22.0) | 452 | (25.9) | |
| 2010 | 333 | (19.1) | 589 | (33.8) | 360 | (20.6) | 463 | (26.5) | |
| 2011 | 329 | (18.9) | 629 | (36.1) | 343 | (19.7) | 441 | (25.3) | |
| Age | <0.0001 | ||||||||
| <40 | 532 | (15.4) | 1219 | (35.3) | 782 | (22.6) | 925 | (22.6) | |
| 40-49 | 884 | (16.9) | 1737 | (33.3) | 1187 | (22.7) | 1411 | (22.7) | |
| 50-59 | 991 | (19.4) | 1751 | (34.2) | 1056 | (20.7) | 1317 | (20.7) | |
| 60-69 | 663 | (19.7) | 1236 | (36.7) | 713 | (21.2) | 756 | (21.2) | |
| ≥70 | 957 | (26.5) | 1294 | (35.9) | 709 | (19.7) | 646 | (19.7) | |
| Race | <0.0001 | ||||||||
| White | 2872 | (23.2) | 4628 | (37.4) | 2381 | (19.3) | 2487 | (20.1) | |
| Black | 590 | (12.8) | 1479 | (31.8) | 1207 | (25.9) | 1377 | (29.6) | |
| Hispanic | 346 | (13.7) | 764 | (30.3) | 499 | (19.8) | 917 | (36.3) | |
| Other | 187 | (18.1) | 323 | (31.3) | 287 | (27.8) | 236 | (22.9) | |
| Unknown | 32 | (17.2) | 43 | (23.1) | 73 | (39.3) | 38 | (20.4) | |
| Insurance status | <0.0001 | ||||||||
| Commercial | 356 | (13.6) | 792 | (30.1) | 606 | (23.1) | 874 | (33.3) | |
| Medicare | 1570 | (20.8) | 2798 | (37.1) | 1619 | (21.5) | 1552 | (20.6) | |
| Medicaid | 753 | (15.6) | 1578 | (32.7) | 1064 | (22.0) | 1434 | (29.7) | |
| Uninsured | 1227 | (26.1) | 1754 | (37.2) | 886 | (18.8) | 844 | (17.9) | |
| Other | 35 | (15.8) | 82 | (36.9) | 70 | (31.5) | 35 | (15.8) | |
| Unknown | 86 | (10.3) | 233 | (27.8) | 202 | (24.1) | 316 | (37.8) | |
| Region | <0.0001 | ||||||||
| Northeast | 644 | (14.2) | 1845 | (40.8) | 1092 | (24.1) | 942 | (20.8) | |
| Midwest | 1367 | (27.7) | 1683 | (34.1) | 896 | (18.2) | 985 | (20.0) | |
| South | 1293 | (15.6) | 2892 | (34.8) | 1642 | (19.8) | 2484 | (29.9) | |
| West | 723 | (24.1) | 817 | (27.2) | 817 | (27.2) | 644 | (21.5) | |
| Location | <.0001 | ||||||||
| Metro | 2957 | (18.1) | 5560 | (34.1) | 3625 | (22.2) | 4177 | (25.6) | |
| Urban | 797 | (25.9) | 1155 | (37.5) | 475 | (15.4) | 654 | (21.2) | |
| Rural | 95 | (27.8) | 126 | (36.8) | 64 | (18.7) | 57 | (16.7) | |
| Unknown | 178 | (17.4) | 396 | (38.7) | 283 | (27.6) | 167 | (16.3 | |
| Hospital type | <.0001 | ||||||||
| Community cancer program |
3342 | (32.7) | 4470 | (43.7) | 1469 | (14.4) | 942 | (9.2) | |
| Academic | 513 | (5.1) | 2642 | (26.1) | 2880 | (28.4) | 4099 | (40.5) | |
| Other | 172 | (42.1) | 125 | (30.6) | 98 | (24.0) | 14 | (3.4) | |
| Histology | 0.7496 | ||||||||
| Squamous | 3271 | (19.3) | 5958 | (35.1) | 3620 | (21.3) | 4144 | (24.4) | |
| Adenocarcinoma | 343 | (20.0) | 597 | (34.9) | 371 | (21.7) | 401 | (23.4) | |
| Adenosquamous | 115 | (19.8) | 185 | (31.9) | 134 | (23.1) | 146 | (25.2) | |
| Other | 298 | (20.1) | 497 | (33.6) | 322 | (21.7) | 364 | (24.6) | |
| Grade | 0.0090 | ||||||||
| 1 | 180 | (20.2) | 308 | (34.6) | 201 | (22.6) | 202 | (22.7) | |
| 2 | 1212 | (19.2) | 2225 | (35.2) | 1318 | (20.8) | 1574 | (24.9) | |
| 3 | 1462 | (20.2) | 2486 | (34.3) | 1491 | (20.6) | 1816 | (25.0) | |
| Unknown | 1173 | (18.7) | 2218 | (35.3) | 1437 | (22.8) | 1463 | (23.3) | |
| Stage | <.0001 | ||||||||
| IIB | 1426 | (17.4) | 2852 | (34.9) | 1812 | (22.2) | 2085 | (25.5) | |
| IIIA | 198 | (23.1) | 304 | (35.4) | 161 | (18.7) | 196 | (22.8) | |
| IIIB | 1955 | (19.5) | 3496 | (34.8) | 2124 | (21.2) | 2459 | (24.5) | |
| IVA | 448 | (26.4) | 585 | (34.5) | 350 | (20.6) | 315 | (18.6) | |
| Brachytherapy | <.0001 | ||||||||
| No | 2284 | (25.9) | 2937 | 33.3) | 1531 | (17.3) | 2080 | (23.6) | |
| Yes | 1743 | (14.6) | 4300 | 36.0) | 2916 | (24.4) | 2975 | (24.9) | |
| Chemotherapy | <.0001 | ||||||||
| No | 1010 | (24.5) | 1426 | 34.6) | 847 | (20.5) | 840 | (20.4) | |
| Yes | 2967 | (18.1) | 5730 | 34.9) | 3554 | (21.7) | 4156 | (25.3) | |
| Unknown | 50 | (21.2) | 81 | 34.3) | 46 | (19.5) | 59 | (25.0) | |