Table 2 Equilibrium test of socio-demographic characteristics between intervention and control groups in baseline(n = 1256)
Socio-demographic characteristics | Control | Intervention | χ2/t | P | |
|---|---|---|---|---|---|
Sex | Boy | 214 | 265 | 0.182 | 0.670 |
Girl | 216 | 253 | |||
Educational degree | Primary school | 289 | 353 | 0.094 | 0.759 |
Middle school | 141 | 165 | |||
Only child | Yes | 196 | 200 | 4.695 | 0.030 |
No | 234 | 318 | |||
Family economic status | Poor | 43 | 63 | 1.752 | 0.416 |
Medium | 240 | 291 | |||
Good | 110 | 118 | |||
Family relationships | Not harmonious | 20 | 24 | 3.824 | 0.148 |
Medium | 157 | 221 | |||
Harmonious | 253 | 273 | |||
Educational level of father | Middle school or lower | 215 | 263 | 0.190 | 0.910 |
High/technical secondary school | 157 | 190 | |||
Junior college or higher | 58 | 65 | |||
Educational level of mother | Middle school or lower | 211 | 287 | 5.264 | 0.072 |
High/technical secondary school | 166 | 186 | |||
Junior college or higher | 53 | 45 | |||
Parenting style | Democracy | 233 | 276 | 3.464 | 0.325 |
Autarchy | 138 | 187 | |||
Indulgence | 50 | 44 | |||
Neglect | 9 | 11 | |||
Academic records | Bad | 130 | 153 | 0.485 | 0.785 |
Medium | 163 | 189 | |||
Good | 137 | 176 | |||
Academic pressure | Low | 74 | 93 | 4.313 | 0.116 |
Medium | 197 | 266 | |||
Great | 159 | 159 | |||
Number of close friends | ≤ 2 | 114 | 148 | 0.668 | 0.716 |
3–5 | 157 | 178 | |||
≥ 6 | 159 | 192 | |||
BMI at baseline | 18.52 ± 3.22 | 17.83 ± 3.02 | 3.194 | 0.001 | |