| Prevalence of scoliosis (%) | Scoliosis group | No scoliosis group | P value |
---|
No. | % | No. | % |
---|
Total | 0.159 | 51 | 100.0 | 32,083 | 100.0 | |
Gender | 0.002 |
Male | 0.088 | 14 | 27.5 | 15,889 | 49.5 | |
Female | 0.228 | 37 | 72.5 | 16,194 | 50.5 |
School-gradea | <0.001 |
4th grade | 0.022 | 1 | 2.0 | 4,518 | 14.1 | |
5th grade | 0.022 | 1 | 1.9 | 4,638 | 14.5 |
6th grade | 0.156 | 7 | 13.0 | 4,475 | 13.9 |
1st year | 0.195 | 12 | 22.2 | 6,152 | 19.2 |
2nd year | 0.144 | 9 | 18.5 | 6,240 | 19.4 |
3rd year | 0.345 | 21 | 19.6 | 6,060 | 18.9 |
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