Table 1.
Sample characteristics of the whole study sample in 2004 (N = 7977)
| Variable | Children (n = 3235) | Adolescents (n = 4742) | Total (N = 7977) |
|---|---|---|---|
| Demographics | |||
| Age, M (s.d.) | 7.03 (1.43) | 12.93 (1.97) | 10.54 (3.40) |
| Girls, n (%) | 1578 (48.8) | 2288 (48.2) | 3866 (48.5) |
| SHTBs | |||
| SHTBs (either one or both), n (%)a | 75 (2.3) | 324 (6.8) | 399 (5.0) |
| Self-harm thoughts (no behaviour), n (%)b | 30 (0.9) | 51 (1.1) | 81 (1.0) |
| Self-harm behaviour (with thoughts), n (%)a | 6 (0.2) | 45 (0.9) | 51 (0.6) |
| Self-harm behaviour (without thoughts), n (%)a | 39 (1.2) | 228 (4.8) | 267 (3.3) |
| Correlates of SHTBs | |||
| Psychiatric disorder (DSM-IV), n (%) | 240 (7.4) | 524 (11.1) | 764 (9.6) |
| Childhood trauma (PTSD module), n (%)c | 530 (16.4) | 1171 (24.7) | 1701 (21.3) |
| Stressful life events (SLE module), n (%)d | 1662 (51.4) | 2908 (61.3) | 4570 (57.3) |
| Parental distress (GHQ-12), n (%)e | 638 (19.7) | 1109 (23.4) | 1747 (21.9) |
| Family dysfunction, n (%)f | 511 (15.8) | 838 (17.7) | 1349 (16.9) |
| Peer problems, reported by the parent, n (%)g | 321 (9.9) | 542 (11.4) | 863 (10.8) |
| Inhibitory control deficits, reported by the parent, n (%)h | 703 (21.7) | 815 (17.2) | 1518 (19.0) |
| Physical pain, n (%)i | 212 (6.6) | 490 (10.3) | 702 (8.8) |
aMissing data for 272 participants (3.4%), bmissing data for 274 participants (3.4%), cmissing data for 187 participants (2.3%), dmissing data for 203 participants (2.5%), emissing data for 241 participants (3.0%), fmissing data for 276 participants (3.5%), gmissing data for 42 participants (0.5%), hmissing data for 52 participants (0.7%) and imissing data for 112 participants (1.4%).
Note. Children = aged 5–9 years; adolescents = aged 10–16 years; self-harm thoughts and behaviours, self-harm thoughts, self-harm behaviour = composite scores, incl. parental report and/or young person report.