Table 1 Guardians and questionnaire information

Duration of consent (min)

9.5 ± 3.6

8.6 ± 2.2

Age of guardians (years)

32.8 ± 6.8

32.0 ± 5.9

Gender of guardian (total (female))

20(2)

20(6)

Education of guardian level

 1

2

0

 2

8

10

 3

4

7

 4

6

3

VSD knowledge (1–10)

9.5 ± 1.1

8.3 ± 2

Operation knowledge (1–10)

9.6 ± 0.9

8.4 ± 1.9

Overall understanding (1–10)

9.9 ± 0.4

9.2 ± 1.6

Usefulness of 3D

9.7 ± 1.0