Table 1.

Descriptive statistics of the subjects’ age by cervical stage.

CVM Stage	Numbers	Mean Age (Years) ± SD
CS 1	100	7.27 ± 1.17
CS 2	100	9.41 ± 1.60
CS 3	100	10.99 ± 1.28
CS 4	100	12.54 ± 1.08
CS 5	100	14.72 ± 1.58
CS 6	100	17.65 ± 1.69
Total	600	12.10 ± 3.52

CVM: cervical vertebral maturation; SD: standard deviation; CS: cervical stage.