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Table 1 Frequencies and percentages regarding demographics, health-related variables and self-reported experience of interpersonal maltreatment and chronic adversity in a sample of adolescents with NSSI
| Variables | All | Girls | Boys |
|---|---|---|---|
| n = 771-816 | n = 437-465x | n = 331-348x | |
| Demographic variables | |||
| Born in Sweden | 746 (92.0) | 433 (93.3) | 310 (90.1) |
| Parents’ born in Sweden | 607 (74.5) | 355 (76.3) | 250 (72.0) |
| Theoretical education | 357 (43.8) | 213 (45.8) | 143 (41.1) |
| Both parents working | 572 (74.2) | 324 (74.1) | 247 (74.6) |
| Living with both parents† | 554 (68.2) | 309 (66.5) | 244 (70.9) |
| Health-related variables | |||
| Ever smoked | 461 (57.1) | 276 (59.6) | 183 (53.5) |
| Ever tried alcohol | 648 (79.6) | 369 (79.4) | 276 (79.8) |
| Ever used drugs | 129 (15.9) | 64 (13.8) | 64 (18.4) |
| Has friend who has self-injured | 560 (69.3) | 379 (82.4) | 179 (51.9) |
| Ever had professional contact* | 378 (46.8) | 250 (54.5) | 125 (36.2) |
| Experience of interpersonal maltreatment and chronic adversity | |||
| Bullied | 368 (45.1) | 233 (50.1) | 132 (37.9) |
| Prolonged illness or handicap | 111 (13.6) | 63 (13.5) | 48 (13.8) |
| Emotional abuse | 401 (49.1) | 274 (58.9) | 124 (35.6) |
| Physical abuse by adult in family | 173 (21.2) | 116 (24.9) | 56 (16.1) |
| Sexual abuse by adult in family or other | 121 (14.8) | 110 (23.7) | 10 (2.9) |
| Parental chronic adversity+ | 466 (57.1) | 292 (62.8) | 171 (49.1) |
