Table 1.
Baseline characteristics
| ChemoRT | Induction Chemotherapy | P‐value | |
|---|---|---|---|
| n = 4041 (%) | n = 816 (%) | ||
| Age | |||
| Mean (SD) | 53.9 (13.3) | 51.1 (13.6) | <.001 |
| Sex | |||
| Male | 2842 (70.3) | 619 (75.9) | .007 |
| Female | 1199 (29.7) | 197 (24.1) | |
| Year of diagnosis | |||
| 2004 | 259 (6.4) | 44 (5.4) | .007 |
| 2005 | 308 (7.6) | 47 (5.8) | |
| 2006 | 299 (7.4) | 54 (6.6) | |
| 2007 | 332 (8.2) | 78 (9.6) | |
| 2008 | 326 (8.1) | 70 (8.6) | |
| 2009 | 360 (8.9) | 81 (9.9) | |
| 2010 | 394 (9.8) | 112 (13.7) | |
| 2011 | 400 (9.9) | 87 (10.7) | |
| 2012 | 410 (10.1) | 87 (10.7) | |
| 2013 | 469 (11.6) | 80 (9.8) | |
| 2014 | 484 (12.0) | 76 (9.3) | |
| Charlson/Deyo score | |||
| 0 | 3488 (86.3) | 709 (86.9) | .57 |
| 1 | 448 (11.1) | 91 (11.2) | |
| 2 | 105 (2.6) | 16 (2.0) | |
| Race | |||
| White | 2505 (62.7) | 514 (63.5) | .008 |
| African American | 534 (13.4) | 134 (16.6) | |
| Other | 956 (23.9) | 161 (19.9) | |
| Facility type | |||
| Academic | 1528 (43.7) | 287 (43.0) | .73 |
| Non Academic | 1969 (56.3) | 381 (57.0) | |
| Facility location | |||
| East | 1568 (44.8) | 298 (44.6) | .06 |
| Central | 1277 (36.5) | 268 (40.1) | |
| West | 652 (18.6) | 102 (15.3) | |
| Insurance status | |||
| Private | 2253 (56.6) | 425 (53.2) | <.001 |
| Medicaid or other Govt | 600 (15.1) | 165 (20.7) | |
| Medicare | 889 (22.3) | 136 (17.0) | |
| Uninsured | 240 (6.0) | 73 (9.1) | |
| Education level | |||
| High | 2108 (52.6) | 381 (47.0) | .004 |
| Low | 1903 (47.4) | 430 (53.0) | |
| Income level | |||
| High | 2326 (58.0) | 454 (56.0) | .29 |
| Low | 1683 (42.0) | 357 (44.0) | |
| County type | |||
| Metro | 3381 (85.9) | 668 (83.9) | .07 |
| Urban | 506 (12.9) | 111 (13.9) | |
| Rural | 47 (1.2) | 17 (2.1) | |
| Clinical T stage | |||
| T1 | 1084 (26.8) | 176 (21.6) | <.001 |
| T2 | 1192 (29.5) | 191 (23.4) | |
| T3 | 774 (19.2) | 159 (19.5) | |
| T4 | 991 (24.5) | 290 (35.5) | |
| Clinical N stage | |||
| N0 | 844 (20.9) | 150 (18.4) | <.001 |
| N1 | 1281 (31.7) | 219 (26.8) | |
| N2 | 1591 (39.4) | 332 (40.7) | |
| N3 | 325 (8.0) | 115 (14.1) | |
| RT dose | |||
| ≥7000 cGy | 2447 (60.6) | 441 (54.0) | .001 |
| <7000 cGy | 1594 (39.4) | 375 (46.0) | |