TABLE 3.
Prevalence of characteristics of non-suicidal self-injury in adolescents.
| Characteristic | Number of studies (n) | NSSI prevalence (%) | 95% CI | Heterogeneity test |
|
| I2/% | p | ||||
| Frequency | |||||
| Episodic frequency | 6 | 8.3 | 5.4–12.5 | 98.606 | <0.001 |
| Repetitive frequency | 6 | 20.3 | 13.9–28.6 | 99.295 | <0.001 |
| Severity | |||||
| Minor/mild | 5 | 12.6 | 6.4–23.3 | 99.432 | <0.001 |
| Moderate/severe | 5 | 11.6 | 10.0–13.3 | 84.917 | <0.001 |
| Method | |||||
| One method | 6 | 11.1 | 8.8–13.9 | 88.157 | <0.001 |
| Multiple methods | 6 | 16.0 | 11.0–22.6 | 97.003 | <0.001 |
| Type | |||||
| Cutting | 19 | 7.0 | 5.7–8.6 | 97.996 | <0.001 |
| Biting | 12 | 8.6 | 6.4–11.4 | 98.957 | <0.001 |
| Burning | 17 | 2.5 | 1.8–3.4 | 97.394 | <0.001 |
| Carving | 7 | 7.8 | 5.1–12.0 | 97.608 | <0.001 |
| Pinching | 4 | 10.0 | 6.7–14.8 | 96.367 | <0.001 |
| Pulling hair | 10 | 9.8 | 8.3–11.5 | 97.429 | <0.001 |
| Scratching | 13 | 8.6 | 6.6–10.9 | 97.755 | <0.001 |
| Banging/hitting | 18 | 12.0 | 8.9–15.9 | 99.566 | <0.001 |
| Interfering with wounds | 5 | 7.8 | 4.8–12.3 | 96.291 | <0.001 |
| Rubbing skin | 3 | 3.6 | 2.0–6.6 | 96.620 | <0.001 |
| Sticking needles | 3 | 3.6 | 1.8–7.0 | 96.664 | <0.001 |
| Swallowing drug/toxic substance/chemicals | 3 | 1.0 | 0.5–2.2 | 93.874 | <0.001 |