Journal of the American Academy of Child & Adolescent Psychiatry
ARTICLESPubertal Stage and Deliberate Self-Harm in Adolescents
Section snippets
METHOD
The International Youth Development Study (IYDS) is a binational, longitudinal study of adolescent health and development. Each state used a two-stage cluster sampling procedure. In the first stage, schools at each study year level were selected at random from a stratified sampling frame of all schools in Victoria, Australia (Catholic, independent, and government) and the U.S. state of Washington (public, private, and alternative). At stage two, single intact classes from each school for the
RESULTS
We excluded forty-four 16-year-olds and one 17-year-old because they were beyond the age at which puberty is usually complete, leaving 1,944 participants in grade 7 and 1,910 in grade 9 available for analysis, a potential analysis sample of 3,854. Valid self-harm data were available for 3,528 of the 3,854 participants and valid puberty data for 3,618. Data on both variables were available on 3,332 (86%) of all participants. This was used as the denominator for all further analyses. The mean age
DISCUSSION
Deliberate self-harm becomes common in early adolescence, with increases in self-poisoning and self-laceration particularly marked in females (Hawton et al., 2002). In this study, the odds of self-harm were four- to fivefold higher in late puberty after adjustment for age and school grade level. The association with pubertal stage was evident in boys but appeared more striking in girls in whom self-laceration and self-poisoning constituted the great proportion of self-harm from late puberty.
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This research was supported by funding from the National Institutes of Health grant DA-12140, the Victorian Health Promotion Foundation, and the Australian Alcohol Education and Rehabilitation Fund.