Table 1.
Descriptive statistics of the data
| Factors | BCS Group (n = 56) | Mastectomy Group (n = 58) | ||||
|---|---|---|---|---|---|---|
| Median | Minimum | Maximum | Median | Minimum | Maximum | |
| Age | 54 | 34 | 79 | 53 | 34 | 78 |
| PTV volume (cc) | 1104.0 | 417.7 | 2273.0 | 633.8 | 188.4 | 1239.0 |
| PTV min (Gy) | 33.3 | 9.5 | 50.4 | 36.0 | 13.67 | 50.4 |
| PTV max (Gy) | 62.5 | 51.6 | 69.0 | 55.7 | 51.5 | 65.3 |
| PTV mean (Gy) | 51.8 | 41.5 | 62.1 | 51.3 | 48.9 | 57.2 |
| Left lung volume (cc) | 1142.5 | 759.7 | 1564.3 | 1130.2 | 740.7 | 2241.0 |
| Lung min (Gy) | 0.5 | 0.1 | 2.7 | 0.3 | 0.1 | 3.4 |
| Lung max (Gy) | 54.7 | 47.3 | 66.4 | 53.9 | 49.8 | 66.6 |
| Lung mean (Gy) | 12.4 | 5.1 | 20.8 | 15.5 | 3.8 | 51.1 |
| Lung V5 (%) | 40.0 | 12.1 | 64.3 | 44.0 | 11.0 | 65.2 |
| Lung V10 (%) | 30.0 | 11.3 | 57.6 | 37.0 | 8.5 | 50.2 |
| Lung V20 (%) | 24.4 | 7.8 | 49.2 | 30 | 5.7 | 42.8 |
| Heart volume (cc) | 674.1 | 466.3 | 1064.0 | 614.3 | 441.1 | 848.1 |
| Heart min (Gy) | 0.8 | 0.3 | 45.0 | 0.4 | 0.1 | 40.0 |
| Heart max (Gy) | 51.3 | 12.5 | 58.5 | 51.4 | 5.5 | 54.6 |
| Heart mean (Gy) | 5.0 | 2.1 | 10.2 | 6.4 | 2.5 | 16.2 |
| Heart V10 (%) | 10.0 | 2.2 | 37.0 | 13.1 | 6.0 | 38.0 |
| Heart V25 (%) | 6.6 | 0.9 | 50.0 | 10.0 | 3.5 | 32.0 |
| Heart V35 (%) | 4.6 | 0.5 | 30.0 | 8.0 | 1.9 | 28.0 |
BCS: Breast-conserving surgery, PTV: Planning target volume, n: number of patients, Gy: Gray, cc: cubic centimeter, max: maximum, min: minimum