pISSN 2234-7518
eISSN 2005-372X

Table. 2.

Comparison of the estimated prevalence of malocclusion with respect to grade and sex

Group Value*
Elementary school E1 (33,743) Number 5,623.8
Total (%) 8.3
Male (%) 7.4
Female (%) 9.2
E4 (33,856) Number 5,642.7
Total (%) 15.8
Male (%) 14.3
Female (%) 17.4
Middle school M1 (47,051) Number 7,841.8
Total (%) 22.9
Male (%) 21.0
Female (%) 24.9
High school H1 (51,346) Number 8,557.7
Total (%) 25.3
Male (%) 23.3
Female (%) 27.0
Total (165,996) Number 27,666
Total (%) 18.7
Male (%) 16.5
Female (%) 19.6
p-value Grade: E1 < E4 < M1 < H1, p < 0.0001; Sex: Male < Female, p < 0.0001; Grade*Sex, p = 0.296

p-value from two-way analysis of variance test regarding two factors including four grade levels and sex.

E1, The first grade of elementary school; E4, the fourth grade of elementary school; M1, the first grade of middle school (seventh grade); H1, the first grade of high school (tenth grade).

*Secondary data based on raw data from annual reports of national students health examination results from 2012 to 2017.20

Korean J Orthod 2020;50:197~205 https://doi.org/10.4041/kjod.2020.50.3.197
© Korean J Orthod