Table 3.
Multivariable Logistic Regression, Probability of Complex Radiation Modalities
| SBRT1 | IMRT2 | |||||
|---|---|---|---|---|---|---|
| Observations used: | All episodes (SBRT) = 40,993 (2,835) | All episodes (IMRT) = 40,993 (2,456) | ||||
| OR | 95% CI | P-value | OR | 95% CI | P-value | |
| Demographics | ||||||
| Gender | ||||||
| Female | — | — | 0.001 | — | — | 0.02 |
| Male | 1.14 | 1.05, 1.23 | 1.10 | 1.02, 1.20 | ||
| Age group | ||||||
| 65–74 | — | — | <0.001 | — | — | 0.3 |
| 75–84 | 0.88 | 0.81, 0.95 | 0.94 | 0.86, 1.03 | ||
| 85+ | 0.60 | 0.52, 0.69 | 0.91 | 0.80, 1.04 | ||
| Treatment characteristics | ||||||
| Major procedure(s) | ||||||
| No | — | — | <0.001 | — | — | <0.001 |
| Yes | 1.22 | 1.13, 1.33 | 0.74 | 0.67, 0.81 | ||
| Chemotherapy | ||||||
| No | — | — | <0.001 | — | — | 0.5 |
| Yes | 0.58 | 0.53, 0.63 | 0.97 | 0.88, 1.07 | ||
| Year | ||||||
| 2015 | — | — | <0.001 | — | — | 0.03 |
| 2016 | 1.30 | 1.08, 1.56 | 1.01 | 0.88, 1.15 | ||
| 2017 | 1.56 | 1.31, 1.86 | 1.17 | 1.02, 1.33 | ||
| Facility Type | ||||||
| FREE | — | — | <0.001 | — | — | <0.001 |
| OPD | 2.01 | 1.71, 2.36 | 0.44 | 0.38, 0.51 | ||
| Year * Provider type | ||||||
| 2016 * OPD | 0.86 | 0.69, 1.07 | 0.4 | 0.96 | 0.77, 1.19 | 0.8 |
| 2017 * OPD | 0.90 | 0.73, 1.11 | 1.03 | 0.84, 1.26 | ||
| Clinical outcomes | ||||||
| Death during 90-Day episode | ||||||
| Did not die within 90 days | — | — | <0.001 | — | — | <0.001 |
| Death within 1–30 days | 0.23 | 0.17, 0.31 | 0.62 | 0.49, 0.77 | ||
| Death within 31–60 days | 0.28 | 0.23, 0.35 | 0.78 | 0.66, 0.91 | ||
| Death within 61–90 days | 0.37 | 0.30, 0.45 | 0.72 | 0.60, 0.86 | ||
Abbreviations: 95% CI, 95% confidence interval; EBRT, external beam radiotherapy; FREE, freestanding; IMRT, intensity modulated radiotherapy; OPD, hospital-affiliated outpatient; OR, odds ratio; SBRT, stereotactic body radiotherapy.
1
Probability of SBRT (versus EBRT or IMRT alone)
2
Probability of IMRT (versus EBRT or SBRT alone).