A systematic review comparing two popular methods to assess a Type D personality effect
- PMID: 33962138
- DOI: 10.1016/j.genhosppsych.2021.04.002
A systematic review comparing two popular methods to assess a Type D personality effect
Abstract
Introduction: Type D personality, operationalized as high scores on negative affectivity (NA) and social inhibition (SI), has been associated with various medical and psychosocial outcomes. The recent failure to replicate several earlier findings could result from the various methods used to assess the Type D effect. Despite recommendations to analyze the continuous NA and SI scores, a popular approach groups people as having Type D personality or not. This method does not adequately detect a Type D effect as it is also sensitive to main effects of NA or SI only, suggesting the literature contains false positive Type D effects. Here, we systematically assess the extent of this problem.
Method: We conducted a systematic review including 44 published studies assessing a Type D effect with both a continuous and dichotomous operationalization.
Results: The dichotomous method showed poor agreement with the continuous Type D effect. Of the 89 significant dichotomous method effects, 37 (41.6%) were Type D effects according to the continuous method. The remaining 52 (58.4%) are therefore likely not Type D effects based on the continuous method, as 42 (47.2%) were main effects of NA or SI only.
Conclusion: Half of the published Type D effect according to the dichotomous method may be false positives, with only NA or SI driving the outcome.
Keywords: Dichotomization; Interaction; Negative affectivity; Social inhibition; Type D personality.
Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved.
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