Class

The sample’s demographic data

Student trainees’ number

Sex

average age ± ET

3rd year 1

13

Male

21 ± 1.8

3rd year 2

16

Male

3rd year 3

15

Female

3rd year 4

14

Male

3rd year 5

16

Male

3rd year 6

16

Female

3rd year 7

11

Male

3rd year 8

15

Female