Table 2.
Logistic regression models to assess factors associated with use of > 2 Gy/fraction for breast + nodes.
| Breast + nodes |
||||||
|---|---|---|---|---|---|---|
| Frequencies | Univariate analyses |
Multivariable analyses |
||||
| >2 Gy/fraction | ≤2 Gy/fraction | |||||
| (N = 95, 8%) | (N = 1024, 92%) | OR (95% CI) | P value | OR (95% CI) | P value | |
| Age at radiation therapy | <0.001 | <0.001 | ||||
| <40 | 0 | 104 (100%) | – | – | – | – |
| 40–49 | 15 (5%) | 265 (95%) | 0.54 (0.28–1.07) | 0.08 | 0.56 (0.28–1.14) | 0.1 |
| 50–59 | 21 (7%) | 291 (93%) | 0.69 (0.37–1.28) | 0.2 | 0.67 (0.35–1.30) | 0.2 |
| 60–69 | 23 (9%) | 221 (91%) | Reference | Reference | ||
| 70–79 | 18 (14%) | 108 (86%) | 1.60 (0.83–3.09) | 0.2 | 1.40 (0.69–2.86) | 0.3 |
| ≥80 | 18 (34%) | 35 (66%) | 4.94 (2.42–10.08) | <0.001 | 6.21 (2.81–13.75) | <0.001 |
| Laterality | 0.6 | 0.4 | ||||
| Left | 52 (9%) | 531 (91%) | Reference | Reference | ||
| Right | 43 (8%) | 493 (92%) | 0.89 (0.58–1.36) | 0.6 | 0.81 (0.51–1.30) | 0.4 |
| Year | 0.7 | 0.5 | ||||
| 2009 | 13 (11%) | 104 (89%) | Reference | Reference | ||
| 2010 | 14 (7%) | 193 (93%) | 0.58 (0.26–1.28) | 0.2 | 0.48 (0.20–1.16) | 0.1 |
| 2011 | 22 (9%) | 212 (91%) | 0.83 (0.40–1.71) | 0.6 | 0.86 (0.38–1.95) | 0.7 |
| 2012 | 23 (9%) | 243 (91%) | 0.76 (0.37–1.55) | 0.4 | 0.69 (0.31–1.56) | 0.4 |
| 2013 | 23 (8%) | 272 (92%) | 0.68 (0.33–1.39) | 0.3 | 0.65 (0.29–1.44) | 0.3 |
| Clinical group | <0.001 | <0.001 | ||||
| Early | 31 (7%) | 399 (93%) | Reference | Reference | ||
| Advanced | 47 (16%) | 254 (84%) | 2.38 (1.47–3.85) | <0.001 | 2.17 (1.28–3.68) | 0.004 |
| Missing | 17 (4%) | 371 (96%) | 0.59 (0.32–1.08) | 0.09 | 0.75 (0.39–1.47) | 0.4 |
| Socioeconomic status | <0.001 | 0.007 | ||||
| Most disadvantaged | 25 (11%) | 209 (89%) | Reference | Reference | ||
| Second quintile | 29 (15%) | 159 (85%) | 1.52 (0.86–2.70) | 0.1 | 1.18 (0.61–2.30) | 0.6 |
| Third quintile | 13 (6%) | 202 (94%) | 0.54 (0.27–1.08) | 0.08 | 0.51 (0.23–1.10) | 0.09 |
| Fourth quintile | 23 (10%) | 204 (90%) | 0.94 (0.52–1.71) | 0.8 | 0.95 (0.47–1.91) | 0.9 |
| Least disadvantaged | 5 (2%) | 250 (98%) | 0.17 (0.06–0.44) | <0.001 | 0.25 (0.09–0.70) | 0.009 |
| Remoteness of residency | <0.001 | <0.001 | ||||
| Major city | 34 (5%) | 727 (95%) | Reference | Reference | ||
| Inner regional | 43 (17%) | 203 (83%) | 4.53 (2.81–7.29) | <0.001 | 3.70 (2.10–6.53) | <0.001 |
| Outer regional | 17 (16%) | 91 (84%) | 3.99 (2.15–7.44) | <0.001 | 3.13 (1.48–6.60) | 0.003 |
| Remote/very remote | 1 (25%) | 3 (75%) | 7.13 (0.72–70.32) | 0.09 | 6.90 (0.63–75.43) | 0.1 |
| Country of birth | 0.4 | 0.3 | ||||
| Australia | 62 (9%) | 627 (91%) | Reference | Reference | ||
| Overseas | 33 (8%) | 397 (92%) | 0.84 (0.54–1.31) | 0.4 | 1.34 (0.79–2.26) | 0.3 |