Adult attachment representations and depressive symptoms: A meta-analysis.

Background: Attachment theory has long argued that insecure and disorganized attachment representations are associated with vulnerability to psychopathology in general, and depressive symptoms in particular. However, studies assessing the link between insecure and disorganized attachment and depressive symptoms report inconsistent results. The primary aim of this meta-analysis was to examine the extent to which adult attachment representations are associated with depressive symptoms.

Methods: We conducted a literature search for published studies using PsycINFO, MEDLINE, and ProQuest in March 2017, identifying 55 samples (N = 4,386). Eligible studies assessed depression using a well-validated self-report or clinical diagnostic measure of depression and attachment using the Adult Attachment Interview.

Results: Results demonstrated that insecure individuals had higher levels of depression than secure-autonomous individuals (d = 0.21, 95% CI [0.08-0.33]). Specifically, insecure-preoccupied individuals (d = 0.48, 95% CI [0.30-0.65]), but not insecure-dismissing individuals (d = 0.09, 95% CI [-0.03-0.22]), exhibited significantly more depressive symptoms than the secure-autonomous individuals. Additionally, unresolved adults had higher levels of depression than adults with organized attachment classifications (d = 0.29, 95% CI [0.13-0.44]).

Limitations: Due to the nature of the studies reviewed, causal inferences regarding the links found between adult attachment representations and depressive symptoms may not be drawn. Further, the aggregate effect sizes do not solely reflect the magnitude of the association between attachment representations and clinically-diagnosed major depressive disorder.

Conclusions: The results of this meta-analysis have important conceptual and practical implications for attachment-based prevention and intervention efforts, as they suggest that attachment representations, specifically insecure-preoccupied and unresolved, are associated with depressive symptoms in adulthood. Future research using longitudinal and intervention-based designs should examine the extent to which insecure-preoccupied and unresolved attachment lead to increased depressive symptoms, as well as the mechanisms by which these attachment patterns across the life span may increase vulnerability to depressive symptoms in adulthood.