Risk perceptions predicted subsequent vaccination. However, perceived risk phrased in terms of feelings rather than as a purely cognitive probability judgment predicted better. Because neither feeling at risk nor anticipated regret is represented in the most commonly used theories of health behavior, the data suggest that these theories are missing important constructs.

Borderline Personality Disorder (BPD) is a severe and disabling psychiatric condition that typically emerges in late adolescence or early adulthood. Nearly 50% of individuals with BPD have a co-occurring Alcohol Use Disorder (AUD) at some point in the course of their illness. This study explores clinical characteristics of adolescents and young adults (age 30 years and younger) with BPD and AUD (N= 21) compared to BPD without any history of substance use disorders (N=17). Based on theoretical considerations and previous findings, we hypothesized that adolescents and young adults with BPD and AUDs would be more impulsive and exhibit higher rates of suicidal behavior than individuals with BPD and no substance use disorders. Consistent with our first hypothesis, the BPD/AUD group was more impulsive than the BPD only group. However, the two groups did not differ on measures of suicidal behavior. Overall, impulsivity was correlated with total number of suicide attempts in the adolescent/young adult group. When older BPD participants were included in the comparison (up to age 55), the BPD/AUD group exhibited more lifetime suicide attempts that were higher in medical lethality than the BPD only group, suggesting an overall increased lifetime suicide risk in the BPD/AUD group. The relationship between impulsivity, AUD, and suicidal behavior and lifetime suicide risk in adolescent and young adults with BPD is discussed.