Table 2.
Multivariable Logistic Regression, Probability of ≤10 fractions *
| Observations used: All bone metastases (subset ≤10 fractions) = 40,993 (29,939) | |||
|---|---|---|---|
| OR | 95% CI | P-value | |
| Demographics | |||
| Gender | |||
| Female | — | — | 0.2 |
| Male | 1.03 | 0.98, 1.08 | |
| Age group | |||
| 65–74 | — | — | <0.001 |
| 75–84 | 1.08 | 1.03, 1.14 | |
| 85+ | 1.32 | 1.22, 1.43 | |
| Treatment Characteristics | |||
| Major procedure(s) | |||
| No | — | — | 0.007 |
| Yes | 0.93 | 0.89, 0.98 | |
| Chemotherapy | |||
| No | — | — | 0.016 |
| Yes | 1.07 | 1.01, 1.13 | |
| Radiation modality | |||
| SBRT | — | — | <0.001 |
| EBRT | 0.01 | 0.01, 0.02 | |
| IMRT | 0.00 | 0.00, 0.01 | |
| Year | |||
| 2015 | — | — | <0.001 |
| 2016 | 1.20 | 1.11, 1.30 | |
| 2017 | 1.37 | 1.27, 1.49 | |
| Facility Type | |||
| FREE | — | — | <0.001 |
| OPD | 1.93 | 1.79, 2.09 | |
| Year * Provider type | |||
| 2016 * OPD | 1.03 | 0.92, 1.15 | 0.10 |
| 2017 * OPD | 1.13 | 1.01, 1.26 | |
| Clinical Outcomes | |||
| Death during 90-Day episode | |||
| Did not die within 90 days | — | — | <0.001 |
| Death within 1–30 days | 14.4 | 11.3, 18.7 | |
| Death within 31–60 days | 2.06 | 1.88, 2.26 | |
| Death within 61–90 days | 1.31 | 1.20, 1.43 | |
Abbreviations: EBRT, external beam radiotherapy; FREE, freestanding; IMRT, intensity-modulated radiotherapy; OPD, hospital-affiliated outpatient; OR, odds ratio; SBRT, stereotactic body radiotherapy.
*
Versus long-course RT (11+ fractions)