pISSN 2234-7518
eISSN 2005-372X

Table. 1.

The estimated prevalence of malocclusion in nationwide oral health examinations during 2012–2017

Year Elementary school Middle school High school Total



E1 E4 M1 H1





Number % of malocclusion Number % of malocclusion Number % of malocclusion Number % of malocclusion Number % of malocclusion
2012 5,848 7.0 5,912 16.0 8,734 21.7 8,572 24.3 29,066 18.3
2013 5,679 8.5 5,776 16.4 8,461 23.0 8,258 26.6 28,174 19.7
2014 5,639 9.4 5,584 17.2 7,787 23.3 8,129 28.7 27,139 20.3
2015 5,553 8.2 5,481 14.4 7,437 23.1 8,883 23.8 27,354 17.8
2016 5,545 9.4 5,486 16.5 7,419 23.7 9,086 25.3 27,536 19.3
2017 5,479 7.2 5,617 14.3 7,213 22.4 8,418 23.1 26,727 16.9
Sum 33,743 - 33,856 - 47,051 - 51,346 - 165,996 -
Mean 5,623.8 8.3 5,642.7 15.8 7,841.8 22.9 8,557.7 25.3 27,666 18.7
ρ-value* 0.129 −0.495 0.406 −0.383 −0.449
p-value 0.808 0.318 0.425 0.454 0.372

Source of numbers and % values: annual reports of national students health examination results from 2012 to 2017.20

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).

*Pearson correlation coefficient value across years in each grade group, Pearson correlation analysis was performed across years in each grade group.

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