Table 5 Dosimetric comparison of target and organs at risk between the spacer group and the control group after propensity score-matching
Spacer (n = 39) | Control (n = 39) | P | |
|---|---|---|---|
Mean (± S.D.) | Mean (± S.D.) | ||
Prostate, ml | 39.2 (± 20.9) | 39.3 (± 31.5) | 1.00 |
Seminal vesicles, ml | 13.1 (± 5.4) | 10.1 (± 5.6) | 0.02 |
PTV, ml | 99.0 (± 37.2) | 97.3 (± 49.2) | 0.86 |
Rectum, ml | 49.5 (± 22.3) | 52.3 (± 15.8) | 0.52 |
Bladder, ml | 273.3 (± 133.6) | 238.6 (± 119.3) | 0.23 |
PTV mean, Gy | 37.2 (± 0.3) | 37.5 (± 0.4) | < 0.01 |
PTV max, Gy | 39.0 (± 0.6) | 39.5 (± 0.8) | < 0.01 |
Rectum mean, Gy | 15.1 (± 1.3) | 17.0 (± 1.3) | < 0.01 |
Rectum max, Gy | 36.9 (± 1.8) | 38.7 (± 0.7) | < 0.01 |
Rectum V100%, % | 0.4 (± 0.7) | 2.7 (± 1.6) | < 0.01 |
Rectum V90%, % | 2.3 (± 2.2) | 8.5 (± 2.7) | < 0.01 |
Rectum V80%, % | 5.0 (± 3.5) | 13.7 (± 3.4) | < 0.01 |
Rectum V75%, % | 6.9 (± 4.1) | 16.6 (± 3.8) | < 0.01 |
Rectum V50%, % | 27.6 (± 5.6) | 35.6 (± 5.2) | < 0.01 |
Bladder mean, Gy | 10.7 (± 3.8) | 12.2 (± 3.5) | 0.09 |
Bladder max, Gy | 38.6 (± 0.6) | 39.1 (± 0.7) | < 0.01 |
Bladder V100%, % | 3.8 (± 1.8) | 4.2 (± 1.9) | 0.39 |
Bladder V50%, % | 22.9 (± 9.9) | 25.2 (± 10.6) | 0.32 |
Femur max, Gy | 15.0 (± 1.5) | 15.1 (± 1.8) | 0.01 |