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Basic information of participants (M ± SD).
| Items | Over all (336) | Men (160) | Women (176) | P-value |
| Age (year) | 19.4 ± 1.3 | 19.4 ± 1.2 | 19.5 ± 1.4 | 0.363 |
| BMI (kg/m2) | 21.0 ± 2.4 | 21.8 ± 2.1 | 20.3 ± 2.4 | 0.000 |
| Incoming (Yuan/ month) |
3.7 ± 2.3 | 4.1 ± 2.5 | 3.2 ± 2.0 | 0.000 |
