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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

From: A cross-sectional study of adolescent non-suicidal self-injury: support for a specific distress-function relationship

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)
  1. Note. NSSI = non-suicidal self-injury, xthere are three individuals with missing data on gender, which explains why the number of girls and boys do not add up to the total, together or every- other week, *not specifically for self-injury, +including alcohol or drug abuse, mental health problems, in jail, prolonged handicap or illness, separated from parent(s), divorce, quarreling during divorce.