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Table 1 Characteristics of the cohort and cases of first-time self-harm (N = 165,932)

From: Socioeconomic position and self-harm among adolescents: a population-based cohort study in Stockholm, Sweden

Characteristic Distribution of the cohort Incidence of first-time self-harm per 100,000 person-years
N (%) All Boys Girls
Total 165,932 (100) 400
Gender
 Boys 85,182 (51.3) 143
 Girls 80,750 (48.7) 675
Parental education
 Primary 15,829 (9.5) 469 159 796
 Secondary 69,564 (41.9) 453 154 773
 Tertiary 80,539 (48.6) 341 131 567
Household income
 1st quintile (Lowest) 32,659 (19.7) 381 123 658
 2nd quintile 33,239 (20.0) 459 145 795
 3rd quintile 33,356 (20.1) 442 176 727
 4th quintile 33,344 (20.1) 383 157 628
 5th quintile (highest) 33,334 (20.1) 335 116 567
Receipt of welfare
 No 15,606 (93.8) 394 142 664
 Yes 10,326 (6.2) 486 166 837
Parental country of birth
 Sweden 107,470 (64.8) 400 140 676
 Mixed 21,790 (13.1) 505 184 852
 Outside Sweden 36,672 (22.1) 339 130 565
Number of parents in the household
 One 49,256 (29.7) 567 207 951
 Two 116,676 (70.3) 331 117 559
History of mental disorder of biological parent
 No 148,718 (89.6) 365 132 615
 Yes 17,214 (10.4) 705 244 1206