Standard deviation of tumor displacement position (mm)

Vertical

Longitudinal

Lateral

Mean ± SD

p*

Mean ± SD

p*

Mean ± SD

p*

Comparison of biofeedback

Visual

0.72 ± 0.46

0.40

0.91 ± 0.89

0.64

0.68 ± 0.69

0.44

Audio

0.53 ± 0.39

1.06 ± 0.78

0.59 ± 0.68

Comparison according to selection method

Patient preference

0.75 ± 0.41

0.08

1.10 ± 0.93

0.14

0.65 ± 0.68

0.17

Imaging

0.49 ± 0.38

0.61 ± 0.69

0.45 ± 0.29