Self-control refers to the ability to override impulses and behave in accordance with societal norms, and deficits in self-control are strongly associated with conduct problems, externalizing disorders, crime, and violence. Here, we examine the psychometric properties of the Brief Self-Control Scale (BSCS) and its refined version (BSCS-R) among a forensic sample (n = 131) of incarcerated male youth and a school sample of male (n = 257) and female (n = 213) youth from Portugal. Confirmatory factor analysis indicated that the original one-factor structure of the BSCS and the refined two-factor structure of the BSCS-R obtained adequate fits. The BSCS demonstrated strong measurement invariance across gender and setting (forensic versus school), while the BSCS-R only revealed gender measurement invariance. The BSCS also tended to perform better that the BSCS-R in terms of other psychometric properties, including internal consistency measured by Alpha and Omega coefficients, discriminant and convergent validities, criterion validity, and known-groups validity. Findings support the use of the BSCS among justice-involved and community youth, but caution is advised regarding the use of its refined version in forensic settings.
The Dark Triad (DT) consists of three personality traits (machiavellianism, narcissism, and psychopathy). This is considered relevant for understanding the development of undesirable characteristics for society, frequently observed in young people and adults with antisocial and delinquent behaviours. Aversive personality traits have only recently aroused interest in researchers as a cohesive set of factors. The aim of this study was to analyse the associations of the DT (machiavellianism, narcissism, and psychopathy) with juvenile delinquency, conduct disorder (CD), and trauma. For this, a total sample of Portuguese adolescents (n=601; Mage=15.95 years, SD=1.05 years, range=13-18 years) was used, subdivided into a male forensic group, male school group, and female school group. After the elaboration of multiple linear regression models, the results indicated that the psychopathy dimension was the one with the greatest association with juvenile delinquency and CD, while the narcissism dimension was the one with the greatest association with trauma. In future studies, the associations of the DT with juvenile delinquency, CD, and trauma in Portuguese adolescents should continue to be explored in the forensic and school contexts, to further clarify these relationships and contribute to the development and implementation of prevention and intervention programs for Youth with these characteristics.
The UPPS-P Impulsive Behavior Scale is one of the most used and easily administered self-report measures of impulsive traits. The main objective of this study was to examine the psychometric properties of the shorter SUPPS-P scale among a school sample of 470 youth (Mage = 15.89 years, SD = 1.00) from Portugal, subdivided into males (n = 257, Mage = 15.97 years, SD = 0.98) and females (n = 213, Mage = 15.79 years, SD = 1.03). Confirmatory factor analysis results revealed that the latent five-factor structure (i.e., Negative urgency, Lack of perseverance, Lack of premeditation, Sensation seeking, and Positive urgency) obtained adequate fit and strong measurement invariance demonstrated across sex. The SUPPS-P scale also demonstrated satisfactory psychometric properties in terms of internal consistency, discriminant and convergent (e.g., with measures of youth delinquency, aggression) validities, and criterion-related validity (e.g., with crime seriousness). Findings support the use of the SUPPS-P scale in youth. Given the importance of adolescence as a critical period characterized by increases in impulsive behaviors, having a short, valid, reliable, and easily administered assessment of impulsive tendencies is important and clinically impactful.
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