Sociodemographic characteristics of the study subjects (n=3907)
| Characteristic | n (%) | Characteristic | n (%) |
| Gender | Currently living with | ||
| Male | 2243 (57.4) | Both parents | 2833 (73.0) |
| Female | 1664 (42.6) | Mother only | 510 (13.1) |
| Sexual orientation | Father only | 179 (4.6) | |
| Heterosexual | 3078 (79.5) | Mother and stepfather | 110 (2.8) |
| Homosexual | 57 (1.5) | Father and stepmother | 64 (1.6) |
| Bisexual | 205 (5.3) | Others | 185 (4.8) |
| Don't know | 531 (13.7) | Did not answer | 26 |
| Did not answer | 36 | Satisfaction with family life | |
| Mean age (SD) (years) | 15.3 (1.9) | Very unhappy | 55 (1.4) |
| Age (years) | Unhappy | 220 (5.7) | |
| 11 | 2 (0.1) | Fair | 1283 (33.4) |
| 12 | 354 (9.3) | Happy | 1642 (42.7) |
| 13 | 412 (10.8) | Very happy | 645 (16.8) |
| 14 | 618 (16.2) | Did not answer | 62 |
| 15 | 663 (17.3) | Having sexual experience | |
| 16 | 722 (18.9) | No | 3674 (94.8) |
| 17 | 589 (15.4) | Yes | 202 (5.2) |
| 18–22 | 462 (12.1) | Did not answer | 31 |
| Did not answer | 85 | Age at first sexual experience (n=171)* | 15.1 (2.0) |
| Ethnicity | Sexually harassing others | ||
| Chinese | 3779 (97.4) | No | 3377 (87.0) |
| Non-Chinese | 100 (2.6) | Yes | 505 (13.0) |
| Did not answer | 28 | Did not answer | 25 |
| Place of birth | Being sexually harassed | ||
| Hong Kong | 2589 (67.6) | No | 3580 (92.2) |
| Elsewhere | 1242 (32.4) | Yes | 303 (7.8) |
| Did not answer | 76 | Did not answer | 24 |
| Current school level | Nude chats | ||
| Forms 1+2 | 961 (24.6) | No | 3824 (98.5) |
| Forms 3+4 | 1471 (37.7) | Yes | 58 (1.5) |
| Forms 5+6 | 1475 (37.8) | Did not answer | 25 |
| Sexting | |||
| No | 2884 (74.2) | ||
| Yes | 1005 (25.8) | ||
| Did not answer | 18 |
*Of the 202 students with sexual experience, 31 did not reveal their age at first sexual experience.
SD, Standard deviation.