| Gender |
| Boys | 1812 | 30 | 1.697 | < 0.001 | 1.445–1.992 |
| Girls | 2044 | 26 | 1.00 | | |
| Age |
| 13 | 1871 | 32 | 1.979 | < 0.001 | 1.682–2.328 |
| 15 | 1985 | 24 | 1.00 | | |
| Perceived family affluence |
| Good | 2682 | 26 | 1.00 | | |
| Average | 960 | 30 | 1.069 | 0.464 | 0.894–1.279 |
| Poor | 214 | 48 | 1.913 | < 0.001 | 1.399–2.615 |
| Expectations for further studies |
| High school | 2111 | 27 | 1.00 | | |
| Vocational school | 1344 | 28 | .931 | 0.431 | 0.779–1.112 |
| Academic achievement |
| Good | 2237 | 27 | 1.021 | 0.814 | 0.861–1.279 |
| Average or below | 1619 | 29 | 1.00 | | |
| Feeling of loneliness |
| Yes | 2135 | 37 | 2.820 | < 0.001 | 2.385–3.335 |
| No | 1721 | 17 | 1.00 | | |
| School engagement |
| High | 2802 | 24 | 1.00 | | |
| Low | 1054 | 40 | 1.618 | < 0.001 | 1.336–1.959 |
| Parental support |
| Supportive | 3501 | 27 | 1.00 | | |
| Not supportive | 355 | 36 | 1.076 | 0.582 | 0.829–1.397 |
| Liking school |
| Much | 2251 | 25 | 1.097 | 0.331 | 0.910–1.323 |
| Less | 1605 | 32 | 1.00 | | |
| Student relations |
| Good relations | 2934 | 22 | 1.00 | | |
| Poor relations | 922 | 46 | 2.650 | < 0.001 | 2.220–3.164 |
| Academic support |
| High | 2528 | 25 | 1.00 | | |
| Low | 1328 | 32 | 1.090 | 0.356 | 0.908–1.309 |
| Teacher-student relations |
| High | 2752 | 26 | 1.236 | 0.046 | 1.004–1.521 |
| Low | 1104 | 32 | 1.00 | | |
| School strain |
| High | 1807 | 32 | 1.129 | 0.167 | 0.950–1.342 |
| Low | 2049 | 25 | 1.00 | | |