Table 1. General characteristics of subjects based on depressive symptoms, n (%).
| Variables | Depressive symptoms* | p | |
|---|---|---|---|
| No (n = 77,676) | Yes (n = 31,697) | ||
| Sex | <0.001 | ||
| Male | 43,103 (76.6) | 13,149 (23.4) | |
| Female | 34,573 (65.1) | 18,548 (34.9) | |
| School year | <0.001 | ||
| 7 | 26,789 (73.6) | 9,628 (26.4) | |
| 8 | 25,640 (70.5) | 10,747 (29.5) | |
| 9 | 25,247 (69.0) | 11,322 (31.0) | |
| Socioeconomic level | <0.001 | ||
| High | 29,220 (74.3) | 10,118 (25.7) | |
| Median | 37,060 (72.1) | 14,365 (27.9) | |
| Low | 11,396 (61.2) | 7,214 (38.8) | |
| Scale of area of residence | 0.001 | ||
| Large city | 34,709 (70.6) | 14,460 (29.4) | |
| Small city | 33,103 (71.6) | 13,129 (28.4) | |
| Countryside | 9,864 (70.6) | 4,108 (29.4) | |
| School record | <0.001 | ||
| High | 31,294 (76.0) | 9,863 (24.0) | |
| Median | 20,449 (73.2) | 7,503 (26.8) | |
| Low | 25,933 (64.4) | 14,331 (35.6) | |
| Self-reported happiness | <0.001 | ||
| Happy | 53,079 (80.5) | 12,862 (19.5) | |
| Medium | 19,908 (64.9) | 10,776 (35.1) | |
| Unhappy | 4,689 (36.8) | 8,059 (63.2) | |
| Self-reported health status | <0.001 | ||
| Good | 58,178 (74.9) | 19,454 (25.1) | |
| Normal | 16,718 (64.2) | 9,336 (35.8) | |
| Poor | 2,780 (48.9) | 2,907 (51.1) | |
| Smoking | <0.001 | ||
| No | 66,351 (73.5) | 23,864 (26.5) | |
| Yes | 11,325 (59.1) | 7,833 (40.9) | |
| Alcohol consumption | <0.001 | ||
| No | 55,054 (75.6) | 17,737 (24.4) | |
| Yes | 22,622 (61.8) | 13,960 (38.2) | |
| BMI | <0.001 | ||
| Underweight | 26,463 (71.9) | 10,344 (28.1) | |
| Normal | 45,186 (70.4) | 19,001 (29.6) | |
| Overweight | 6,027 (71.9) | 2,352 (28.1) | |
| Self-reported weight | <0.001 | ||
| Underweight | 22,806 (72.1) | 8,823 (27.9) | |
| Normal | 27,833 (72.8) | 10,389 (27.2) | |
| Overweight | 27,037 (68.4) | 12,485 (31.6) | |
* Experience of daily sadness and despair to the degree of interrupting one’s daily routine that has lasted for the last 2 weeks to 12 months.