Table 5.
Systematic tumour bed (TB) setup errors for laser setup (Σlaser) and for bone verification (Σbone) for groups determined using patient- and treatment-related factors
| Laser | Factor | Group 1 | Σlaser (mm) | Group 2 | Σlaser (mm) | p-value | Direction |
|---|---|---|---|---|---|---|---|
| Breast volume | <855 cm3 | 2.5 | ≥855 cm3 | 4.2 | 0.03 | SI | |
| Seroma visibility | Not visible/subtle | 2.8 | Easily visible | 3.5 | 0.02 | LR | |
| Not visible/subtle | 2.6 | Easily visible | 3.2 | 0.002 | SI | ||
| Not visible/subtle | 3.1 | Easily visible | 4.1 | 0.005 | AP | ||
| Surgical closing technique | Closed | 2.7 | Open | 3.3 | 0.02 | LR | |
| Closed | 2.5 | Open | 3.2 | 0.04 | SI | ||
| Bones | Factor | Group 1 | Σbone(mm) | Group 2 | Σbone(mm) | p-value | Direction |
| TB axial position | 1, 2 and 3 | 2.1 | 4 | 2.7 | 0.04 | LR | |
| TB axial position | 1 | 1.6 | 2, 3 and 4 | 2.3 | 0.002 | AP | |
| Breast volume | <855 cm | 1.9 | ≥855cm3 | 2.7 | 0.015 | SI |
AP, anteroposterior; LR, left–right; SI, superior–inferior; TB, tumour bed.
P-values for univariate non-parametric Levene's test are given. Data given only for factors that gave a significant difference in systematic bony anatomy verification error between patient groups (p < 0.05).