Research report
Can personality assessment predict future depression? A twelve-month follow-up of 631 subjects

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Abstract

Background

Personality assessment provides a description of a person's fundamental emotional needs and of the higher cognitive processes that modulate thoughts, feelings, and behavior. Prior studies by us examined personality and mood at the same time. Assessing personality may allow prediction of mood changes over time in a longitudinal study, as described in earlier prospective studies by Paula Clayton and others.

Method

A group of 631 adults representative of the general population completed the Temperament and Character Inventory (TCI) and Center for Epidemiological Studies depression scale (CES-D) at baseline and one year later.

Results

TCI scores at baseline accounted for gender differences in levels of depression. TCI personality scores were strongly stable (range in r = .78 to .85 for each of seven dimensions) whereas mood was only moderately stable (r = .62) over the twelve-month follow-up. Baseline personality scores (particularly high Harm Avoidance and low Self-Directedness) explained 44% of the variance in the change in depression. Baseline levels and changes in Harm Avoidance and Self-Directedness explained 52% of the variance in the change in depression at follow-up.

Limitations

The follow-up sample was representative of the target population except for slightly lower Novelty Seeking scores.

Clinical relevance

Observable personality levels strongly predict mood changes. Personality development may reduce vulnerability to future depression.

Section snippets

Sample

We attempted to study a stratified random sample of 1000 noninstitutionalized adults, 18 years of age or older, who lived in the greater metropolitan area of St. Louis, Missouri in June 1994 and to follow them up twelve months later. The Washington University Human Subjects Committee approved the study methods. Potential participants initially were identified at random from standard telephone lists and asked if they were willing to participate in a questionnaire survey of depression,

Results

The levels of depressive symptoms, as measured by CES-D scores, are summarized for men and for women in Table 1. Women more often had CES-D scores of 21 or more than did men (18% versus 13%), as expected from previous community surveys. There were also strong differences in personality between men and women: women were higher than men in Harm Avoidance, Reward Dependence, and Cooperativeness (Table 2).

The observed gender differences in personality accounted for the observed differences in CES-D

Discussion

Our findings indicate that TCI Harm Avoidance is a marker of emotional vulnerability to depression. In contrast, TCI Self-Directedness is a marker of executive functions that protect a person from depression. As a result, individuals with depression are likely to be both anxiety-prone (i.e., high in Harm Avoidance) and immature (i.e., low in Self-Directedness and Cooperativeness) (see Table 7). In prior work, we showed that depression and these same personality variables were correlated at the

Acknowledgment

We thank Dr. Richard Hudgens for his valuable comments on an earlier draft.

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    Supported in part by grants from the National Institutes of Health MH-60879, MH-62130, AA-840314.

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