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Table 2 Setup displacement (mean ± standard deviation in mm) in three translational directions according to lower and higher 50% percentile of body-related factors before RT

From: Impact of body-mass factors on setup displacement in patients with head and neck cancer treated with radiotherapy using daily on-line image guidance

Variable

AP-SE

AP-RE

SI-SE

SI-RE

ML-SE

ML-RE

Body weight

      

Lower

0.9 ± 0.5

0.8 ± 0.3

2.1 ± 0.9

1.2 ± 0.4

1.8 ± 0.8

1.1 ± 0.3

Higher

1.3 ± 0.6

0.9 ± 0.3

2.4 ± 1.0

1.8 ± 0.9

1.9 ± 0.6

1.0 ± 0.4

p value

0.045*

0.250

0.567

0.023*

0.436

0.461

Body height

      

Lower

1.0 ± 0.6

0.8 ± 0.3

1.9 ± 0.6

1.1 ± 0.3

1.8 ± 0.7

1.1 ± 0.3

Higher

1.3 ± 0.5

0.9 ± 0.3

2.6 ± 1.1

1.9 ± 0.9

1.9 ± 0.7

1.1 ± 0.4

p value

0.081

0.161

0.116

0.002*

0.250

0.838

BMI

      

Lower

1.0 ± 0.5

0.8 ± 0.3

2.2 ± 0.9

1.4 ± 0.7

1.7 ± 0.8

1.1 ± 0.3

Higher

1.3 ± 0.6

0.9 ± 0.3

2.3 ± 1.1

1.6 ± 0.8

2.0 ± 0.5

1.1 ± 0.4

p value

0.187

0.512

0.935

0.217

0.305

0.935

Circumference A

      

Lower

1.0 ± 0.5

0.8 ± 0.2

2.1 ± 1.0

1.4 ± 0.7

1.8 ± 0.8

1.1 ± 0.4

Higher

1.3 ± 0.6

0.9 ± 0.3

2.3 ± 1.0

1.6 ± 0.8

1.9 ± 0.6

1.0 ± 0.3

p value

0.345

0.345

0.775

0.461

0.624

0.267

Circumference B

      

Lower

1.0 ± 0.5

0.8 ± 0.3

2.1 ± 1.0

1.4 ± 0.7

1.7 ± 0.8

1.1 ± 0.4

Higher

1.3 ± 0.6

0.8 ± 0.3

2.4 ± 1.0

1.6 ± 0.8

2.0 ± 0.5

1.0 ± 0.3

p value

0.389

0.486

0.305

0.187

0.345

0.412

Circumference C

      

Lower

1.1 ± 0.5

0.8 ± 0.3

2.3 ± 1.1

1.4 ± 0.7

1.7 ± 0.8

1.0 ± 0.4

Higher

1.2 ± 0.6

0.9 ± 0.3

2.2 ± 0.8

1.6 ± 0.8

2.0 ± 0.5

1.1 ± 0.3

p value

0.486

0.567

0.967

0.345

0.250

0.683

PS

      

0

0.9 ± 0.5

0.7 ± 0.2

2.0 ± 0.7

1.2 ± 0.4

2.0 ± 0.6

1.1 ± 0.4

1-2

1.4 ± 0.6

1.0 ± 0.3

2.6 ±1.2

1.9 ± 1.0

1.6 ± 0.7

1.0 ± 0.4

p value

0.043*

0.015*

0.245

0.043*

0.072*

0.934

  1. Abbreviation: AP = anterior-posterior, SI = superior-inferior, ML = medial-lateral, SE = systemic error, RE = random error, BMI = body mass index, PS = performance status.
  2. Note: asterisk represents statistical significance.