Table 1.
Descriptive statistical analysis of personal background information of respondents (N = 1815).
| Gender | Grade | Age | |||||
|---|---|---|---|---|---|---|---|
| Male | Female | Junior school student | Senior high school student | ≤14 | 14–17 | ≥17 | |
| Ordinary middle school | 526 (60.7%) | 341 (39.3%) | 445 (51.3%) | 422 (48.7%) | 323 (37.3%) | 445 (51.3%) | 99 (11.4%) |
| Key middle schools | 493 (52.0%) | 455 (48.0%) | 505 (53.3%) | 443 (46.7%) | 335 (35.3%) | 515 (54.3%) | 98 (10.3%) |
| Total | 1,019 (56.1%) | 796 (43.9%) | 950 (52.3%) | 865 (47.7%) | 658 (36.3%) | 960 (52.9%) | 197 (10.9%) |
| Test | X2 = 13.81; P = 0.000 <0.001 | X2 = 0.686; P = 0.408 > 0.05 | X2 = 1.72; P = 0.424 > 0.05 | ||||
| Participate in student associations | Family structure | Body mass index (BMI) | |||||
| Yes | No | Two-parent family | Other family | Too light | Standard | Overweight | |
| Ordinary middle school | 590(68.1%) | 277(31.9% | 707(81.5%) | 160(18.5%) | 266(30.7%) | 429(49.5%) | 172(19.8%) |
| Key middle schools | 496(52.3%) | 452(47.7%) | 714(75.3%) | 234(24.7%) | 264(27.8%) | 501(52.8%) | 183(19.3%) |
| Total | 1086(59.8%) | 729(40.2%) | 1421(78.3%) | 394(21.7%) | 530(29.2%) | 930(51.2%) | 355(19.6%) |
| Test | X2 = 46.62; P = 0.000 <0.001 | X2 = 10.34; P = 0.001 <0.01 | X2 = 2.31; P = 0.315 > 0.05 | ||||