Table 3.
Odds of an order for hypofractionated radiation therapy
| Odds Ratio | 95% Confidence Interval | |
|---|---|---|
| Q2 2019 versus Q1 2019 | 1.31 | 0.97-1.76 |
| Q3 2019 versus Q1 2019 | 1.24 | 0.92-1.66 |
| Q4 2019 versus Q1 2019 | 1.44 | 1.06-1.94 |
| Q1 2020 versus Q1 2019 | 1.59 | 1.17-2.17 |
| Q2 2020 versus Q1 2019 | 1.03 | 0.73-1.47 |
| Q3 2020 versus Q1 2019 | 1.77 | 1.29-2.42 |
| Q4 2020 versus Q1 2019 | 1.61 | 1.18-2.20 |
| Age | 1.02 | 1.01-1.03 |
| Rural urbanicity (vs. urban) | 1.07 | 0.87-1.33 |
| Local income below $40k (versus ≥ or unknown) | 0.86 | 0.68-1.08 |
| Local income above $80k (versus ≤ or unknown) | 1.46 | 1.15-1.85 |
| Region 3 (DE, DC, MD, PA, VA, WV vs. other) | 0.90 | 0.65-1.25 |
| Region 4 (AL, FL, GA, KY, MS, NC, SC, TN vs. other) | 0.99 | 0.78-1.26 |
| Region 5 (IL, IN, MI, MN, OH, WI vs. other) | 1.43 | 1.08-1.90 |
| Region 6 (AR, LA, NM, OK, TX vs. other) | 0.75 | 0.58-0.97 |
| Order from academic setting (vs. nonacademic) | 1.44 | 0.95-2.18 |
| Order from hospital (vs. nonhospital) | 0.99 | 0.80-1.23 |
Abbreviations: AL = Alabama; AR = Arizona; DC = Washington DC; DE = Delaware; FL = Florida; GA = Georgia; IL = Illinois; IN = Indiana; KY = Kentucky; LA = Louisiana; MD = Maryland; MI = Michigan; MN = Minnestoa; MS = Mississipi; NC = North Carolina; NM = New Mexico; OH = Ohio; OK = Oklahoma; PA = Pennsylvania; Q = quarter; SC = South Carolina; TN = Tennessee; TX = Texas; VA = Virginia; WI = Wisconsin; WV = West Virginia.
Radiation therapy orders were considered hypofractionated if they were for 15 to 21 fractions, and conventionally fractionated if they were for 28 to 35 fractions.