The distributions and numbers of the studied adolescents in Liaoning Province
| Area | City | Numbers of school selected | Male | Female | Total |
| Urban | Shenyang | 3 | 436 (11.68%) | 452 (12.11%) | 1841 (49.34%) |
| Jinzhou | 3 | 473 (12.68%) | 480 (12.87%) | ||
| Rural | Donggang | 3 | 469 (12.57%) | 466 (12.49%) | 1890 (50.66%) |
| Zhuanghe | 3 | 481 (12.89%) | 471 (12.62%) | ||
| Total | 12 | 1859 (49.82%) | 1872 (50.17%) | 3731 |