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  1. The relationship between Type D personality and insomnia
    Akram U, McCarty K, Akram A, Gardani M, Tan A, Villarreal D, et al.
    Sleep Health, 2018 08;4(4):360-363.
    PMID: 30031529 DOI: 10.1016/j.sleh.2018.04.005
    OBJECTIVES: Type D personality is characterized by the combination of social inhibition and negative affectivity. This study examined the relationship between Type D personality and insomnia symptoms amongst a sample of the general-population.

    METHODS: Adults from the general-population (n = 392) completed online measures of Type D personality (DS14) and insomnia severity.

    RESULTS: Individuals with the Type D personality trait reported significantly greater symptoms of insomnia relative to Non-Type Ds. Moreover, insomnia-symptoms were independently related to negative affectivity (NA) and social inhibition (SI) and the Type D interaction (i.e. synergistic product of SI and NA). Linear regression analysis determined that NA but not SI significantly predicted insomnia symptoms after controlling for age and sex. However, after accounting for the Type D interaction, negative affectivity remained the only significant predictor of insomnia-symptoms.

    CONCLUSIONS: The Type D personality type appears to be related to insomnia-symptoms, both as a categorical and dimensional construct. These outcomes support prior research evidencing that whilst Type D personality is related to poor sleep in adolescents, NA appears to be the main contributor.

    Matched MeSH terms: Type D Personality*
  2. Fulltext Factor structure of type D scale in Malaysian patients with coronary artery disease
    Kaur, Satpal, Nor Zuraida Zainal, Wah, Yun Low, Ramasamy, Ravindran, Sidhu, Jaideep Singh
    ASEAN Journal of Psychiatry, 2014;15(2):186-195.
    MyJurnal
    Objective: Type D personality, tendency trait to experience increased NA (Negative Affect) and SI (Social Inhibition) has been associated with negative psychological conditions linked to heart disease. This study aimed to examine the psychometric properties of the Malay version of Type D personality scale (DS14) among Malaysian patients with coronary artery disease (CAD). Methods: In this cross-sectional study 195 patients diagnosed with CAD were selected from National Heart Institute, Kuala Lumpur. They completed the questionnaire including demographic information and the Malay version of DS14 and Hospital Anxiety and Depression Scale (HADS). Results: The structural validity, as demonstrated by exploratory factor analysis of the DS14 was acceptable. The Cronbach's α coefficient for the NA and SI subscales were 0.876 and 0.732, respectively. With the standardized cut-off of NA ≥ 10 and SI ≥ 10, 28.2% of the patients with CAD were defined as having a Type D personality. Anxiety was significantly higher among patients with Type D personality. Conclusion: The results indicate that the Type D personality (DS14) questionnaire is a valid and reliable tool in the Malaysian population. The prevalence of Type D personality in Malaysia falls close to what has been found in Western countries, at least for CAD patients. This study indicates also that it is possible to use the DS14 among the Malaysian population in future cross-cultural studies. ASEAN Journal of Psychiatry, Vol. 15 (2): July - December 2014: 186-195.
    Matched MeSH terms: Type D Personality
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