Table 2.
Predictors of receipt of pre-operative radiation therapy
| Predictor | OR (95% CI) |
|---|---|
| Diagnosis year group | |
| 2000–2004 | 1.00 Referent |
| 2005–2010 | 1.78 (1.360–2.331) |
| Age categories | |
| 18–39 | 0.38 (0.090–1.567) |
| 40–64 | 1.86 (1.453–2.384) |
| 65+ | 1.00 Referent |
| Gender | |
| Male | 1.00 Referent |
| Female | 0.92 (0.720–1.169) |
| Race | |
| Non-Hispanic white | 1.00 Referent |
| Black | 0.97 (0.661–1.411) |
| Other | 1.11 (0.597–2.051) |
| Tumour size | |
| <2 cm | 1.00 Referent |
| ≥2 cm | 1.61 (1.011–2.573) |
| Missing | 1.47 (0.749–2.913) |
| Tumour grade | |
| 1 or 2 | 1.00 Referent |
| 3 | 1.001 (0.750–1.336) |
| 4 | 1.05 (0.323–3.404) |
| Missing/unknown | 2.62 (1.892–3.622) |
| T-stage | |
| 1 and 2 | 1.00 Referent |
| 3 | 1.817 (1.305–2.531) |
| 4 | 8.60 (5.629–13.142) |
| Surgery type | |
| Whipple | 1.00 Referent |
| Total pancreatectomy | 1.02 (0.706–1.462) |
| Other | 0.55 (0.377–0.799) |
| Node positive | |
| Yes | 1.00 Referent |
| No | 0.348 (0.27–0.46) |
| Nodes examined | |
| 0 | 1.00 Referent |
| 1–9 | 1.06 (0.649–1.748) |
| 10–14 | 1.17 (0.689–1.975) |
| 15+ | 0.75 (0.436–1.286) |
| Unknown | 0.83 (0.336–2.063) |
| Registry | |
| Greater California | 1.00 Referent |
| Utah | 4.06 (2.234–7.370) |
| Metropolitan Detroit | 3.82 (2.474–5.893) |
| Louisiana | 2.33 (1.397–3.899) |
| Iowa | 2.20 (1.244–3.873) |
| Connecticut | 2.11 (1.226–3.631) |
| Metropolitan Atlanta | 1.46 (0.717–2.963) |
| Greater Georgia | 1.30 (0.745–2.269) |
| New Jersey | 1.28 (0.822–1.993) |
| Seattle (Puget Sound) | 1.07 (0.541–2.125) |
| Kentucky | 0.98 (0.517–1.844) |
| Los Angeles | 0.77 (0.425–1.382) |
Cox's proportional hazard predictors of receiving pre-operative radiation therapy. Statistically significant predictors of pre-operative radiation therapy are in bold.
OR, odds ratio; CI, confidence interval.