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Demographic and clinical characteristics of study sample (N = 932).
| Variables | Mean (SD) or N (%) |
| Age | 19.78 (1.42) |
| University | |
| Peking University | 168 (18.03) |
| Jilin University | 394 (42.27) |
| Lanzhou University | 161 (17.27) |
| Capital Medical University | 209 (22.43) |
| School grade | |
| First year | 240 (25.75) |
| Second year | 200 (21.46) |
| Third year | 216 (23.18) |
| Fourth year | 276 (29.61) |
| Male gender | 230 (24.68) |
| Rural residence | 400 (42.92) |
| Only child in family | 385 (41.31) |
SD, standard deviation.
