R²

Direction of interfractional motion of the prostate

Regression coefficient

SD

P value

Bladder V10

0.74

(constant)

−0.40

0.31

0.20

AP axis (mm)

0.13

0.13

0.32

SI axis (mm)

−2.39

0.16

<0.01

LR axis (mm)

0.15

0.35

0.66

Bladder V20

0.86

(constant)

−0.46

0.30

0.12

AP axis (mm)

0.55

0.12

<0.01

SI axis (mm)

−2.94

0.16

<0.01

LR axis (mm)

0.17

0.34

<0.62

Bladder V30

0.86

(constant)

−0.35

0.34

<0.31

AP axis (mm)

1.11

0.14

<0.01

SI axis (mm)

−2.84

0.19

<0.01

LR axis (mm)

0.58

0.39

0.14

Bladder V40

0.85

(constant)

−0.13

0.35

0.71

AP axis (mm)

1.37

0.15

<0.01

SI axis (mm)

−2.50

0.19

<0.01

LR axis (mm)

0.59

0.41

0.15

Bladder V50

0.84

(constant)

0.01

0.34

0.99

AP axis (mm)

1.41

0.14

<0.01

SI axis (mm)

−2.13

0.18

<0.01

LR axis (mm)

0.50

0.39

<0.21

Bladder V60

0.82

(constant)

0.09

0.32

0.77

AP axis (mm)

1.36

0.14

<0.01

SI axis (mm)

−1.80

0.17

<0.01

LR axis (mm)

0.42

0.37

0.26

Bladder V70

0.80

(constant)

0.27

0.31

0.39

AP axis (mm)

1.26

0.13

<0.01

SI axis (mm)

−1.49

0.17

<0.01

LR axis (mm)

0.31

0.35

0.39