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This study investigated the position of Type D (high Negative Affectivity and high Social Inhibition) within the Five-Factor Model (FFM) of personality. A sample of 155 healthy subjects were administered the Type D Scale and the NEO-FFI, assessing the FFM traits. Subjects also filled out the General Health Questionnaire and the Job Stress Survey. Negative Affectivity was positively correlated with Neuroticism (0.74) and negatively with Conscientiousness ( m 0.38), Agreeableness ( m 0.37), and Extraversion ( m 0.35). Social Inhibition was negatively correlated with Extraversion ( m 0.61) and Conscientiousness ( m 0.40) and positively with Neuroticism (0.50). Type D subjects reported more somatic distress ( p <0.0001), anxiety ( p <0.0001) and depression ( p <0.01) than non-Type D subjects. An alternative one-dimensional representation of the D-traits was suggested, conceptualized as a dimension ranging from neurotic introversion with relatively low conscientiousness to stable extraversion with relatively high conscientiousness. These findings are discussed in the light of the renewed interest in psychology for type versus dimensional representations of individual differences.
Fruyt et al. (2002) studied this question.