From: Paediatric CT scan usage and referrals of children to computed tomography in Germany-a cross-sectional survey of medical practice and awareness of radiation related health risks among physicians
Frequency class
N
%
none
174
59.0
1-2
46
15.6
3-5
41
13.9
6-10
7
2.4
11-15
3
1.0
> 15
8
2.7
n. a.*
16
5.4
∑
295
100.0