Table 1.
Baseline characteristics of the study population.
| Variable | Private N (%) 32,131 (32.9) |
Medicaid N (%) 10,679 (10.9) |
Medicare N (%) 49,168 (50.4) |
Uninsured N (%) 5,681 (5.8) |
P | |
|---|---|---|---|---|---|---|
| Age at diagnosis, Median (range) | 58.74 (8.9) | 55.81 (8.5) | 71.70 (8.3) | 56.37 (8.3) | 0.001 | |
| Sex | Male | 15,621 (48.6) | 5,279 (49.43) | 25,362 (51.6) | 2,994 (52.7) | |
| Female | 16,510 (51.4) | 5,400 (50.6) | 23,806 (48.4) | 2,687 (47.3) | 0.001 | |
| Race | White | 27,556 (86.5) | 7,736 (73.0) | 42,564 (87.1) | 4,370 (77.5) | |
| Black | 2,999 (9.4) | 2,256 (21.3) | 4,934 (10.1) | 1,014 (18.0) | 0.001 | |
| Other | 1,321 (4.1) | 603 (5.7) | 1,346 (2.8) | 252 (4.5) | ||
| Unknown | 255 | 84 | 324 | 45 | ||
| Education | >=13% NHSD* | 13,575 (42.4) | 6,562 (61.6) | 22,735 (46.3) | 3,510 (62.0) | 0.001 |
| <13% NHSD* | 18,475 (57.6) | 4,084 (38.4) | 26,343 (53.7) | 2,152 (38.0) | ||
| Unknown | 81 | 33 | 90 | 19 | ||
| Income | >=$35,000 | 19,579 (61.1) | 4,372 (41.1) | 26,708 (54.5) | 2,341 (41.4) | |
| <35,000 | 12,451 (38.9) | 6,268 (58.9) | 22,341 (45.6) | 3,314 (58.6) | 0.001 | |
| Unknown | 101 | 39 | 119 | 26 | ||
| Place of Living | Urban | 30,670 (98.0) | 10,203 (97.5) | 46,754 (97.4) | 5,425 (97.6) | |
| Rural | 615 (2.0) | 259 (2.5) | 1,235 (2.6) | 134 (2.4) | 0.001 | |
| Unknown | 846 | 217 | 1,179 | 122 | ||
| Hospital Type | Community | 20,089 (63.7) | 5.914 (57.2) | 34,168 (69.6) | 3,417 (61.9) | 0.001 |
| Academic | 11,440 (36.3) | 4,419 (42.8) | 14,939 (30.4) | 2,103 (38.1) | ||
| Unknown | 602 | 346 | 61 | 161 | ||
| Charlson/Deyo Score | 0 | 22,786 (70.9) | 6,861 (64.3) | 27,834 (56.6) | 3,873 (68.2) | |
| 1 | 2,619 (8.2) | 1,153 (10.8) | 7,642 (15.5) | 528 (9.3) | ||
| >=2 | 6,726 (20.9) | 2,665 (25.0) | 13,692 (27.9) | 1,280 (22.5) | 0.001 | |
| Primary site surgery | Yes | 1,477 (4.6) | 329 (3.1) | 1,235 (2.5) | 153 (2.7) | |
| No | 30,508 (95.4) | 10,309 (96.9) | 47,783 (97.5) | 5,499 (97.3) | 0.001 | |
| Chemotherapy | Yes | 20,982 (67.2) | 5,903 (57.2) | 21,714 (45.5) | 2,813 (51.3) | |
| No | 10,254 (32.8) | 4,413 (42.8) | 25,962 (54.5) | 2,675 (48.7) | 0.001 | |
| Radiation Therapy | Yes | 24,984 (78.1) | 7,920 (74.4) | 33,138 (67.7) | 3,941 (69.7) | |
| No | 7,014 (21.9) | 2,721 (25.6) | 15,811 (32.3) | 1,712 (30.3) | 0.001 | |
| Immunotherapy | Yes | 1,515 (4.7) | 315 (3.0) | 1,245 (2.5) | 152 (2.7) | |
| No | 30,538 (95.3) | 10,337 (97.0) | 47,824 (97.5) | 5,520 (97.3) | 0.001 | |
| Year of Diagnosis | 2010–2013 | 21,244 (66.1) | 6,859 (64.2) | 31,550 (64.2) | 4,163 (73.3) | 0.001 |
| 2014–2015 | 10,887 (33.9) | 3,820 (35.8) | 17,618 (35.8) | 1,518 (26.7) | ||
| Primary Cancer Type | Breast | 1,785 (5.6) | 715 (6.7) | 1,554 (3.2) | 359 (6.3) | 0.001 |
| NSCLC | 21,452 (66.8) | 7,000 (65.6) | 31,643 (64.4) | 3,650 (64.3) | ||
| SCLC | 4,523 (14.1) | 1,641 (15.4) | 8,154 (16.6) | 814 (14.3) | ||
| Other types of lung cancer | 1,323 (4.1) | 555 (5.2) | 4,265 (8.7) | 380 (6.7) | ||
| Melanoma | 1,435 (4.5) | 336 (3.2) | 1,649 (3.4) | 209 (3.7) | ||
| Colorectal | 426 (1.3) | 124 (1.2) | 649 (1.3) | 72 (1.3) | ||
| kidney | 1,187 (3.7) | 308 (2.9) | 1,254 (2.6) | 197 (3.5) | ||
NHSD = no high school degree.