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Table 1

Gender- and school-grade of subjects in Scoliosis and No scoliosis groups

Prevalence of scoliosis (%)Scoliosis groupNo scoliosis groupP value
No.%No.%
Total0.15951100.032,083100.0
Gender0.002
 Male0.0881427.515,88949.5
 Female0.2283772.516,19450.5
School-gradea<0.001
 4th grade0.02212.04,51814.1
 5th grade0.02211.94,63814.5
 6th grade0.156713.04,47513.9
 1st year0.1951222.26,15219.2
 2nd year0.144918.56,24019.4
 3rd year0.3452119.66,06018.9
aFourth–sixth grade of elementary school and first–third year of junior high school of those pupils are 9–11 years old and 12–14 years old, respectively, at the start of the new school year