R²

Direction of interfractional motion of the prostate

Regression coefficient

SD

P value

Rectum V10

0.38

(constant)

−0.24

0.16

0.12

AP axis (mm)

−0.63

0.07

<0.01

SI axis (mm)

−0.35

0.08

0.01

LR axis (mm)

0.09

0.18

0.61

Rectum V20

0.73

(constant)

−0.69

0.29

0.02

AP axis (mm)

−1.70

0.12

<0.01

SI axis (mm)

0.16

0.16

0.31

LR axis (mm)

0.50

0.33

0.13

Rectum V30

0.87

(constant)

−0.45

0.27

0.10

AP axis (mm)

−2.23

0.11

<0.01

SI axis (mm)

0.61

0.15

<0.01

LR axis (mm)

0.41

0.31

0.19

Rectum V40

0.92

(constant)

−0.14

0.24

0.54

AP axis (mm)

−2.38

0.10

<0.01

SI axis (mm)

0.82

0.13

<0.01

LR axis (mm)

0.41

0.27

0.13

Rectum V50

0.93

(constant)

0.11

0.21

0.61

AP axis (mm)

−2.33

0.09

<0.01

SI axis (mm)

0.92

0.11

<0.01

LR axis (mm)

0.27

0.24

0.27

Rectum V60

0.94

(constant)

0.41

0.19

0.03

AP axis (mm)

−2.15

0.08

<0.01

SI axis (mm)

1.00

0.10

<0.01

LR axis (mm)

0.12

0.22

0.58

Rectum V70

0.93

(constant)

0.84

0.18

<0.01

AP axis (mm)

−1.83

0.08

<0.01

SI axis (mm)

1.01

0.10

<0.01

LR axis (mm)

−0.17

0.21

0.42