Table 1 Characteristics of the 38 pediatric and adolescent patients included in the study. The number of fractions was 13 or 20 depending on tumor-related risk factors and are prescribed 1.8 Gy / fraction to either 23.4 Gy or 36 Gy to the craniospinal volume

Age (y)

8

4–19

Sex

n

%

Male

25

65.8

Female

13

34.2

 Supine

35

92.1

 Prone

3

7.9

 13

30

78.9

 20

8

21.1

 Yes

25

65.8

 No

13

34.2

 1

20

52.6

 2

6

15.8

 3

12

31.6

 Linac

18

47.4

 3D-CRT

15

83.3

 kV

13

86.7

 MV

2

13.3

 IMRT

3

16.7

 kV

3

100

 Tomo

20

52.6

 Medulloblastoma

21

55.3

 Ependymoma

3

7.9

 Germinoma

2

5.3

 Astrocytoma gr. 2

2

5.3

 Other

9

23.6

 Unknown

1

2.6

Mean

SD

Field length (cm)

65.2

10.7

BMI (Z-score)

0.07

2.0