Table 1.
Descriptive statistics of the bullying victimization items and mental health outcomes.
| Variable | Value | Total, n (%) | Boys, n (%) | Girls, n (%) | χ2/t * | p-Value |
|---|---|---|---|---|---|---|
| Bullying victimization # | ||||||
| Item 1 | 0 | 18,407 (88.8) | 8858 (85.1) | 9549 (92.6) | 297.09 | <0.001 |
| 1 | 2315 (11.2) | 1554 (14.9) | 761 (7.4) | |||
| Item 2 | 0 | 20,182 (97.4) | 10,095 (97.0) | 10,087 (97.8) | 15.86 | <0.001 |
| 1 | 540 (2.7) | 317 (3.0) | 223 (2.2) | |||
| Item 3 | 0 | 20,169 (97.3) | 9982 (95.9) | 10,187 (98.8) | 172.02 | <0.001 |
| 1 | 553 (2.7) | 430 (4.1) | 123 (1.2) | |||
| Item 4 | 0 | 19,836 (95.7) | 9930 (95.4) | 9906 (96.1) | 6.39 | 0.012 |
| 1 | 886 (4.3) | 482 (4.6) | 404 (3.9) | |||
| Item 5 | 0 | 20,488 (98.9) | 10,232 (98.3) | 10,256 (99.5) | 67.37 | <0.001 |
| 1 | 234 (1.1) | 180 (1.7) | 54 (0.5) | |||
| Item 6 | 0 | 20,487 (98.9) | 10,234 (98.3) | 10,253 (99.4) | 61.82 | <0.001 |
| 1 | 235 (1.1) | 178 (1.7) | 57 (0.6) | |||
| Item 7 | 0 | 20,372 (98.3) | 10,182 (97.8) | 10,190 (98.8) | 34.07 | <0.001 |
| 1 | 350 (1.7) | 230 (2.2) | 120 (1.2) | |||
| GAD-7 scores (M, SD) | 4.15 (4.4) | 3.57 (4.3) | 4.73 (4.5) | 19.06 | <0.001 | |
| CES-D scores (M, SD) | 14.36 (10.2) | 12.95 (9.4) | 15.78 (10.7) | 20.21 | <0.001 | |
| NSSI | No | 17,842 (86.1) | 9225 (88.6) | 8617 (83.6) | 109.12 | <0.001 |
| Yes | 2880 (13.9) | 1187 (11.4) | 1693 (16.4) | |||
| Suicidal ideation | No | 17,037 (82.2) | 9096 (87.4) | 7941 (77.0) | 378.71 | <0.001 |
| Yes | 3685 (17.8) | 1316 (12.6) | 2369 (23.0) | |||
| Suicide attempts | No | 19,968 (96.4) | 10,170 (97.7) | 9798 (95.0) | 103.12 | <0.001 |
| Yes | 754 (3.6) | 242 (2.3) | 512 (5.0) |
# For the bullying victimization items, frequencies of two or three times a month or more were coded as 1, and others were coded as 0; * the χ2 test was used for the bullying victimization items, NSSI, suicidal ideation and suicide attempts; the t test was used for the GAD-7 and CES-D scores; NSSI: non-suicidal self-injury.