Table 1 Comparison of the demographic characteristics between the intervention group and the control group
Variables |  | Total (n = 444) | Intervention group (n = 147) | Control group (n = 297) | p |
|---|---|---|---|---|---|
Gender (n, %) | Male | 142 (32.0) | 49 (33.3) | 93 (31.3) | 0.67 |
| Â | Female | 302 (68.0) | 98 (66.7) | 204 (68.7) | Â |
Age (Mean ± SD) |  | 18.4 (0.76) | 18.4 (0.8) | 18.4 (0.7) | 0.89 |
BMI (Mean ± SD) |  | 20.4 (2.6) | 20.4 (2.6) | 20.4 (2.6) | 0.99 |
Ethnic category (n, %) | Han ethnic | 394 (88.7) | 133 (90.5) | 261 (87.9) | 0.42 |
| Â | Minority | 50 (11.3) | 14 (9.5) | 36 (12.1) | Â |
Residence (n, %) | Urban | 215 (48.4) | 74 (50.3) | 141 (47.5) | 0.57 |
| Â | Rural | 229 (51.6) | 73 (49.7) | 156 (52.5) | Â |
Monthly living expenses |  < 800 | 76 (17.1) | 32 (21.8) | 44 (14.8) | 0.081 |
(RMB) | 800–1200 | 225 (50.7) | 76 (51.7) | 149 (50.2) |  |
|  |  > 1200 | 143 (32.2) | 39 (26.5) | 104 (35.0) |  |
Father’s educational level | Low | 78 (17.6) | 28 (19.0) | 50 (16.8) | 0.85 |
(n, %) | Medium | 160 (36.0) | 52 (35.4) | 108 (36.4) | Â |
| Â | High | 206 (46.4) | 67 (45.6) | 139 (46.8) | Â |
Mother’s educational level | Low | 128 (28.8) | 44 (29.9) | 84 (28.3) | 0.90 |
(n, %) | Medium | 162 (36.5) | 54 (36.7) | 108 (36.4) | Â |
| Â | High | 154 (34.7) | 49 (33.3) | 105 (35.4) | Â |