Table 3 Correlation between required margin and patients’ anatomical characteristics

Age (years old)

p = 0.39

p = 0.95

p = 0.40

p = 0.84

p = 0.80

p = 0.46

BMI (kg/m²)

p = 0.74

p = 0.0016^††

p = 0.36

p = 0.09

p = 0.0047^††

p = 0.72

Prostate volume (cc)

p = 0.87

p = 0.91

p = 0.93

p = 0.19

p = 0.71

p = 0.46

Bladder volume (cc)

p = 0.15

p = 0.95

p = 0.36

p = 0.35

p = 0.29

p = 0.41

Rectal volume (cc)

p = 0.18

p = 0.61

p = 0.72

p = 0.70

p = 0.96

p = 0.015^†

Rectal mean area (cm²)

p = 0.23

p = 0.92

p = 0.57

p = 0.97

p = 0.70

p = 0.008^†