title: Nonsuicidal self-injury in a community sample of older children and adolescents of Mexico City.
abstract: BACKGROUND
  In Mexico, as in other countries, studies do not distinguish between attempted suicide and suicidal and nonsuicidal self-injury (NSSI). The aim of this study was to investigate self-injury and its prevalence using several definitions, in addition to studying the frequency of the proposed DSM-5 criteria for NSSI in adolescent girls and boys.
  
  
  METHODS
  The study was observational, descriptive, cross-sectional, and comparative using a nonrandomized sample of adolescent girls and boys from official high schools who completed the self-injury questionnaire.
  
  
  RESULTS
  The participants were 533 older children and adolescents with a mean (SD) age of 13.37 (0.95) years, age range 11 to 17 years, and 54% female sex distribution. The prevalence of NSSI defined according to proposed DSM-5 criteria was 5.6% (N=30) and, according to a broad definition using only item 51 (“Do you hurt yourself without intending to end your life?”), 17.1% (N=140). Prevalence defined by the number of events in the last month (1-3 events) was 9.9% (N=53), in the last 6 months (1-3 events), 11.6% (N=62), and in the last year (5 events), 12.6% (N=67). The age at onset was 11.9 (1.39) years (range 6-15 years). Most DSM-5 criteria were more frequent in girls than boys.
  
  
  CONCLUSIONS
  Suicidal and nonsuicidal self-injury are frequent in the community. Important points for decision-making in schools and medical practice are discussed.
authors.affiliation: Hospital Psiquiátrico Infantil “Dr. Juan N. Navarro” Secretaría de Salud.
authors.forename: Lilia
authors.initials: L
authors.lastname: Albores-Gallo
authors.affiliation: Hospital Psiquiátrico Infantil “Dr. Juan N. Navarro” Secretaría de Salud.
authors.forename: José L
authors.initials: JL
authors.lastname: Méndez-Santos
authors.affiliation: Hospital Psiquiátrico Infantil “Dr. Juan N. Navarro” Secretaría de Salud.
authors.forename: Adriana
authors.initials: A
authors.lastname: Xóchitl-García Luna
authors.affiliation: Hospital Psiquiátrico Infantil “Dr. Juan N. Navarro” Secretaría de Salud.
authors.forename: Yariela
authors.initials: Y
authors.lastname: Delgadillo-González
authors.affiliation: Hospital Psiquiátrico Infantil “Dr. Juan N. Navarro” Secretaría de Salud.
authors.forename: Carlos I
authors.initials: CI
authors.lastname: Chávez-Flores
authors.affiliation: Hospital Psiquiátrico Infantil “Dr. Juan N. Navarro” Secretaría de Salud.
authors.forename: Olga L
authors.initials: OL
authors.lastname: Martínez
mesh_terms: D000293:Adolescent; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico; D015995:Prevalence; D016728:Self-Injurious Behavior / Q000453:epidemiology*; D017678:Sex Distribution; D013406:Suicide, Attempted / Q000706:statistics & numerical data; D011795:Surveys and Questionnaires; D014505:Urban Population