Multidimensional Impulsivity Profile in Young Adults Aged 16 to 25 with Borderline Personality Disorder: A Study Based on the UPPS-P Model

<b>Background</b>: Borderline Personality Disorder (BPD) often emerges during adolescence and young adulthood, a period marked by heightened vulnerability to impulsivity and affective dysregulation. While impulsivity is a core feature of BPD, its multidimensional expression in this age group remains insufficiently documented. This study examined impulsivity traits in young adults with BPD, their associations with depressive and anxiety symptoms, and their links to risk behaviors. <b>Methods</b>: A total of 160 participants aged 16-25 were recruited in Belgium between 2021 and 2023: 44 with BPD from inpatient and outpatient psychiatric services and 116 healthy controls from schools and universities. Assessments included the short UPPS-P, Beck Depression Inventory-II (BDI-II), State-Trait Anxiety Inventory (STAI-T), and the Diagnostic Interview for Borderlines-Revised (DIB-R). Logistic regressions with robust errors and Kendall's tau-b correlations were used. <b>Results</b>: Compared with controls, individuals with BPD scored higher on all UPPS-<i>p</i> subscales except Sensation Seeking (e.g., Negative Urgency: 14 vs. 10, <i>p</i> < 0.001). Logistic regression identified Negative Urgency (OR = 5.31, 95% CI: 2.07-13.62, <i>p</i> = 0.001) and Positive Urgency (OR = 3.26, 95% CI: 1.37-7.75, <i>p</i> = 0.007) as independent predictors of BPD. Within the BPD group, depressive and anxiety symptoms correlated with several UPPS-P dimensions, notably Negative Urgency and Lack of Perseverance. Suicide attempts were associated with the DIB-R total score, BDI-II, and STAI-T, while substance use was linked to the DIB-R impulsivity subscale and STAI-T. <b>Conclusions</b>: Emotional impulsivity-particularly Negative Urgency-emerges as a central feature of BPD in emerging adulthood. Its interplay with depressive and anxiety symptoms, and its associations with suicidal and addictive behaviors, support a dual-level conceptualization of impulsivity as both a dispositional trait and a state-dependent clinical risk factor.