Table 3.
Logistic regression models to assess factors associated with use of > 2 Gy/fraction for all chest wall.
| All chest wall | ||||||
|---|---|---|---|---|---|---|
| Frequencies |
Univariate analyses |
Multivariable analyses |
||||
| >2 Gy/fraction | ≤2 Gy/fraction | |||||
| (N = 214, 9%) | (N = 2149, 91%) | OR (95% CI) | P value | OR (95% CI) | P value | |
| Age at radiation therapy | <0.001 | <0.001 | ||||
| <40 | 14 (6%) | 203 (94%) | 0.56 (0.30–1.03) | 0.06 | 0.81 (0.42–1.57) | 0.5 |
| 40–49 | 47 (8%) | 580 (92%) | 0.66 (0.44–0.99) | 0.04 | 0.74 (0.48–1.16) | 0.2 |
| 50–59 | 35 (6%) | 574 (94%) | 0.49 (0.32–0.77) | 0.002 | 0.53 (0.33–0.85) | 0.009 |
| 60–69 | 54 (11%) | 438 (89%) | Reference | Reference | ||
| 70–79 | 40 (13%) | 266 (87%) | 1.22 (0.79–1.89) | 0.4 | 1.25 (0.77–2.03) | 0.4 |
| ≥80 | 24 (21%) | 88 (79%) | 2.21 (1.30–3.77) | 0.004 | 3.06 (1.66–5.65) | <0.001 |
| Laterality | 0.5 | 0.4 | ||||
| Left | 112 (9%) | 1074 (91%) | Reference | Reference | ||
| Right | 102 (9%) | 1075 (91%) | 0.91 (0.69–1.21) | 0.5 | 0.88 (0.65–1.21) | 0.4 |
| Year | 0.6 | 0.9 | ||||
| 2009 | 13 (7%) | 173 (93%) | Reference | Reference | ||
| 2010 | 44 (9%) | 420 (91%) | 1.39 (0.73–2.65) | 0.3 | 1.22 (0.60–2.46) | 0.6 |
| 2011 | 51 (9%) | 507 (91%) | 1.34 (0.71–2.52) | 0.4 | 1.04 (0.52–2.08) | 0.9 |
| 2012 | 45 (8%) | 513 (92%) | 1.17 (0.62–2.22) | 0.6 | 1.01 (0.50–2.03) | 0.9 |
| 2013 | 61 (10%) | 536 (90%) | 1.51 (0.81–2.282) | 0.2 | 1.08 (0.55–2.14) | 0.8 |
| Clinical group | <0.001 | <0.001 | ||||
| Early | 79 (13%) | 539 (87%) | Reference | Reference | ||
| Advanced | 115 (13%) | 776 (87%) | 1.01 (0.74–1.37) | 0.9 | 0.86 (0.61–1.21) | 0.4 |
| Missing | 20 (2%) | 834 (98%) | 0.16 (0.10–0.27) | <0.001 | 0.18 (0.11–0.30) | <0.001 |
| Socioeconomic status | <0.001 | <0.001 | ||||
| Most disadvantaged | 48 (9%) | 474 (91%) | Reference | Reference | ||
| Second quintile | 63 (17%) | 315 (83%) | 1.98 (1.32–2.95) | <0.001 | 1.23 (0.78–1.92) | 0.4 |
| Third quintile | 21 (4%) | 466 (96%) | 0.44 (0.26–0.75) | 0.003 | 0.45 (0.25–0.80) | 0.007 |
| Fourth quintile | 69 (15%) | 404 (85%) | 1.69 (1.14–2.50) | 0.009 | 1.74 (1.09–2.80) | 0.02 |
| Least disadvantaged | 13 (3%) | 490 (97%) | 0.26 (0.14–0.49) | <0.001 | 0.43 (0.22–0.84) | 0.01 |
| Remoteness of residency | <0.001 | <0.001 | ||||
| Major city | 47 (3%) | 1503 (97%) | Reference | Reference | ||
| Inner regional | 122 (22%) | 435 (78%) | 8.97 (6.30–12.76) | <0.001 | 7.60 (5.12–11.29) | <0.001 |
| Outer regional | 45 (18%) | 202 (82%) | 7.12 (4.61–11.00) | <0.001 | 6.07 (3.65–10.07) | <0.001 |
| Remote/very remote | 0 | 9 (100%) | – | – | – | – |
| Country of birth | <0.001 | 0.4 | ||||
| Australia | 158 (11%) | 1346 (89%) | Reference | Reference | ||
| Overseas | 56 (6%) | 803 (94%) | 0.59 (0.43–0.82) | 0.001 | 1.18 (0.82–1.70) | 0.4 |