Personality data were collected at age 26 years, from 975 Study members (96% of those still living). Participants completed the Multidimensional Personality Questionnaire,47 which provides, for each person, a profile of scores on 10 distinct personality traits that define three superfactors of personality: Negative Emotionality (indexed by three primary traits called Stress Reaction, Alienation and Aggression); Constraint vs Disinhibition (indexed by three primary traits called Traditionalism, Harm Avoidance and Self-Control); and Positive Emotionality (indexed by four primary traits called Social Potency, Achievement, Well Being and Social Closeness). In this study, we report about Negative Emotionality and its three primary traits. Internal reliability coefficients for all traits exceed 0.80.