Table 1.
Patient Characteristics
| Radiation therapy alone (N=5,023) |
Chemoradiation (N=18,206) |
pa | |
|---|---|---|---|
| Age, mean (SD) | 79.4 (5.4) years | 75.8 (4.4) years | <.001 |
| Gender | <.001 | ||
| Male | 2750 (54.7%) | 10540 (57.9%) | |
| Female | 2273 (45.3%) | 7666 (42.1%) | |
| Race | .005 | ||
| White | 4398 (87.6%) | 16197 (89.0%) | |
| Non-white | 625 (12.4%) | 2009 (11.0%) | |
| Charlson-Deyo Score | <.001 | ||
| 0 | 2949 (58.7%) | 11450 (62.9%) | |
| >1 | 2074 (41.3%) | 6756 (37.1%) | |
| Median income | <.001 | ||
| ≥$48,000 | 2522 (50.2%) | 9825 (54.0%) | |
| <48,000 | 2501 (49.8%) | 8381 (46.0%) | |
| Primary insurance payor | .74 | ||
| Private | 491 (9.8%) | 1751 (9.6%) | |
| Non-private | 4532 (90.2%) | 16455 (90.4%) | |
| County location | .045 | ||
| Metropolitan | 4062 (80.9%) | 14489 (79.6%) | |
| Non-metropolitan | 961 (19.1%) | 3717 (20.4%) | |
| Distance to closest facility, mean (SD) | 15.9 (41.4) | 20.4 (74.7) | <.001 |
| Facility type | .98 | ||
| Academic | 1243 (24.8%) | 4502 (24.7%) | |
| Non-academic | 3780 (75.2%) | 13704 (75.3%) | |
| Clinical stage group | <.001 | ||
| IIIA | 3390 (67.5%) | 11523 (63.3%) | |
| IIIB | 1633 (32.5%) | 6683 (36.7%) | |
| Days to start of radiation, mean (SD) | 47.9 (40.2) | 55.5 (46.5) | <.001 |
| Radiation therapy dose, median (IQR) | 64.8 (60.0–66.6) Gy | 64.8 (61.2–66.6) Gy | .67 |
| Elapsed days of radiation, median (IQR) | 50 (45–55) days | 51 (47–56) days | .51 |
| Days to start of chemotherapy, median (IQR) | N/A | 36 (25–54) days | N/A |
| Type of chemotherapy | |||
| Multi-agent | N/A | 15715 (86.3%) | N/A |
| Single-agent/unknown | N/A | 2491 (13.7%) | N/A |
| Type of chemoradiation | |||
| Concurrent | N/A | 15840 (87.0%) | N/A |
| Sequential | N/A | 2366 (13.0%) | N/A |
a
The p values are from the χ2 test for categorical variables and the t-test for continuous variables.
SD, standard deviation; IQR, interquartile range; N/A, not applicable.