Characteristics of Self-Injury in Young Adolescents : Findings from Cross-Sectional and Longitudinal Studies in Swedish Schools

Self-injury in adolescents (e.g. when individuals cut, burn, hit or otherwise deliberately cause themselves direct injury), has gained recognition as a potentially important mental health problem during the past decade. Relatively little has been known about the scope and characteristics of this behavior in Swedish adolescents. This thesis consists of three studies that in different ways explore the characteristics of self-injury among adolescents in the general community. In Study 1 a convenience sample of 202 adolescents responded to a battery of self-report questionnaires on self-injury and a number of related factors at two different occasions. At these times 36.5 % and 40.2 % respectively reported to have deliberately engaged in self-injurious behaviors. Self-injury also showed robust relationships with general psychopathology, an absence of positive feelings to parents, and a ruminative style of emotion regulation. These latter two factors were also predictors of self-injury, independently of general psychopathology. Additionally, in girls, results also indicated a relationship between self-injury and symptoms of eating disorder and negative body esteem. Study 2 used a longitudinal survey design with a 1-year interval to further investigate self-injury in a community sample of 1052 adolescents. The battery of self-report questionnaires on self-injury and related factors was again employed, and both conventional statistical methods and hierarchical cluster analysis were used to analyze the results. Results indicated that 41.5 % and 42.9 % respectively had engaged in self-injury, as reported at the two occasions of data collection. The cluster analyses identified eight different subgroups of self-injuring adolescents (in each gender) based on patterns of self-injury. In both boys and girls a fairly large proportion (about 60 %) of self-injuring adolescents were found in a subgroup reporting low-frequency self-injury only, and little psychological difficulties. T