Attachment Style Statistics in 2026: Distribution, Impact, and Research

Attachment theory is one of the most empirically supported frameworks in psychology, with over six decades of peer-reviewed research. But what do the actual numbers say? How are attachment styles distributed across the population? What impact does attachment insecurity have on relationship outcomes, mental health, and well-being?

This article compiles the most important attachment style statistics from landmark studies -- including the Hazan and Shaver (1987) original research, the Mickelson, Kessler, and Shaver (1997) nationally representative survey, the Bakermans-Kranenburg and van IJzendoorn (2009) meta-analysis, and other peer-reviewed sources -- so you can understand the data behind one of psychology's most important theories.

Every statistic cited below links to its original source. If you want to understand how attachment styles affect real relationships -- yours included -- these are the numbers that matter.

Attachment Style Distribution: How Common Is Each Style?

The distribution of attachment styles across the adult population has been studied extensively since Hazan and Shaver first applied attachment theory to adult romantic relationships in 1987. While exact percentages vary by study and measurement method, the overall pattern is remarkably consistent across decades of research.

Here are the key studies that established these distribution figures:

Hazan and Shaver's landmark 1987 study was the first to demonstrate that the attachment patterns identified in infancy by Mary Ainsworth -- secure, anxious-resistant, and avoidant -- appear in remarkably similar proportions in adult romantic relationships. Their finding that roughly 56% of adults are secure, with the remainder split between anxious and avoidant styles, has been replicated in dozens of subsequent studies.

The Mickelson, Kessler, and Shaver (1997) study remains the gold standard for attachment style distribution data because it used a nationally representative sample of American adults, unlike most attachment studies that rely on college student samples. The study also found significant associations between insecure attachment and demographic variables, childhood adversity, and mental health outcomes.

The Bakermans-Kranenburg and van IJzendoorn (2009) meta-analysis is notable for its scale -- over 10,000 Adult Attachment Interviews from studies conducted across multiple countries. Their finding that 58% are secure closely mirrors the self-report distributions from Hazan and Shaver and Mickelson et al., despite using a very different measurement method (a clinical interview rather than a questionnaire). This convergence across methods strengthens confidence in the overall distribution figures.

Secure Attachment Statistics

Secure attachment is characterized by comfort with both intimacy and independence, effective emotional regulation, and a positive view of both self and others. Here are the key statistics about secure attachment:

Securely attached individuals consistently outperform their insecurely attached counterparts on measures of relationship quality. Research shows that they report higher relationship satisfaction, greater trust, more constructive conflict resolution strategies, and stronger commitment to their partners.

While Gottman's research focuses on relationship behaviors rather than attachment styles per se, the concept of "bids and turns" maps directly onto secure attachment behavior. Securely attached individuals are naturally more likely to both make clear bids for connection and respond positively to their partner's bids -- the exact pattern Gottman identified as the strongest predictor of relationship longevity.

Anxious Attachment Statistics

Anxious attachment (also called preoccupied or anxious-preoccupied) is characterized by a heightened need for closeness, fear of abandonment, and hypervigilance to signs of rejection. Here are the key numbers:

The variation in percentages between studies is partly explained by measurement method. Hazan and Shaver used a three-category forced-choice measure, while the Mickelson et al. study used a similar approach with a nationally representative sample. When attachment is measured on continuous dimensions (as in the Brennan, Clark, and Shaver 1998 Experiences in Close Relationships scale), the boundaries between categories become less rigid, and individuals fall along a spectrum of anxiety and avoidance.

Anxiously attached individuals tend to be deeply attuned to their partner's emotional state -- a strength that can become a vulnerability when neutral signals are interpreted as signs of rejection. Research consistently shows that anxious attachment is associated with lower relationship satisfaction and a greater tendency toward relationship-monitoring behaviors. If you recognize anxious patterns in yourself, our free anxious attachment quiz can help you understand your specific tendencies.

Avoidant Attachment Statistics

Avoidant attachment (also called dismissive or dismissive-avoidant) is characterized by discomfort with emotional closeness, strong preference for self-reliance, and suppression of attachment needs. The data on avoidant attachment reveals an important pattern:

Avoidant attachment is notably the most common insecure attachment style -- more prevalent than anxious or disorganized attachment. Research suggests this may partly reflect cultural values in Western societies that emphasize independence and self-sufficiency, which can reinforce avoidant tendencies.

The Li and Chan (2012) meta-analysis found that avoidance was more strongly negatively associated with relationship satisfaction, connectedness, and perceived support than anxiety. In other words, while both insecure styles are linked to lower relationship quality, avoidance may have a particularly corrosive effect on the feeling of closeness and support between partners.

If you suspect avoidant patterns in your relationship, our free avoidant attachment quiz can help clarify your specific attachment dynamics.

Disorganized (Fearful-Avoidant) Attachment Statistics

Disorganized attachment (also called fearful-avoidant in the adult literature) is characterized by a simultaneous desire for and fear of closeness. It is the least common and least studied of the four attachment styles:

The disorganized/fearful-avoidant classification was not part of the original three-category model used by Hazan and Shaver (1987). It was introduced to adult attachment research through Bartholomew and Horowitz's (1991) four-category model and is measured in AAI research as the "unresolved" classification (which can be coded alongside another primary classification).

This style is often associated with early experiences involving caregivers who were simultaneously sources of comfort and sources of fear -- such as in cases of trauma, abuse, or severe parental psychopathology. The Bakermans-Kranenburg and van IJzendoorn (2009) meta-analysis found that the unresolved classification was significantly more common in clinical populations compared to normative samples, underscoring the link between disorganized attachment and psychological distress.

Attachment and Relationship Satisfaction Statistics

One of the most robust findings in attachment research is the strong link between attachment security and relationship quality. Multiple meta-analyses have quantified this effect:

The Li and Chan (2012) meta-analysis is one of the most comprehensive reviews of attachment and relationship quality. Their findings confirmed that both attachment anxiety and avoidance are detrimental to the cognitive, emotional, and behavioral aspects of relationship quality. Notably, they found that avoidance was more negatively associated with general satisfaction, connectedness, and perceived support than anxiety -- suggesting that emotional withdrawal may be more damaging to relationship quality than emotional reactivity.

Securely attached couples consistently demonstrate better relationship outcomes across research. They report higher levels of trust, commitment, and interdependence. They also show more constructive conflict resolution patterns -- viewing disagreements as problems to solve together rather than threats to the relationship.

Attachment Style and Divorce Statistics

Attachment insecurity is a well-documented risk factor for relationship dissolution, including divorce. While attachment style alone does not determine whether a marriage will end, the research demonstrates a clear statistical relationship:

The relationship between attachment and divorce operates through several mechanisms. Insecurely attached individuals tend to have more destructive conflict patterns -- either escalating (anxious) or stonewalling (avoidant) -- that erode relationship quality over time. They also tend to interpret ambiguous partner behavior more negatively, which creates a chronic undercurrent of dissatisfaction.

Additionally, research has found that attachment insecurity is associated with higher rates of infidelity. A systematic review and meta-analysis published in Heliyon found that both attachment anxiety and avoidance were associated with increased marital infidelity, which is itself a major predictor of divorce.

Attachment and Mental Health Statistics

The link between attachment insecurity and mental health difficulties is one of the most well-documented findings in psychology. Attachment patterns affect not just relationships, but individual psychological well-being:

The specific mental health correlates of each insecure style differ in important ways:

Research published in the Journal of Consulting and Clinical Psychology found that insecure attachment styles, particularly anxious-preoccupied and fearful-avoidant, are linked to higher levels of generalized anxiety disorder and social anxiety disorder. The fear of abandonment and rejection that characterizes anxious attachment fuels chronic worry, while the approach-avoidance conflict in disorganized attachment can create severe emotional dysregulation.

Perhaps most importantly, the Mikulincer and Shaver (2012) review emphasized that attachment security can be enhanced through therapeutic intervention -- meaning these mental health associations are not immutable. Improving attachment security appears to have downstream benefits for psychological well-being more broadly.

Attachment Stability and Change Over Time

One of the most important questions in attachment research is whether attachment styles are fixed or changeable. The data tells a nuanced story: attachment patterns show moderate stability over time, but meaningful change is possible -- and well-documented:

The Waters et al. (2000) study is one of the longest longitudinal attachment studies ever conducted. It followed 50 participants from the Strange Situation assessment at 12 months through the Adult Attachment Interview at age 20. Their finding that 72% maintained their classification supports Bowlby's original hypothesis about the continuity of attachment patterns -- but the 28% who changed demonstrates that attachment is not destiny.

This finding is critical because it shows that change in attachment style is not random -- it is strongly associated with significant life experiences. Negative life events (parental loss, divorce, illness, trauma) doubled the rate of attachment change. This suggests that attachment representations are genuinely responsive to experience, both for better and for worse.

Fraley's meta-analysis tested two competing models: the "prototype" model (early patterns persist but can be gradually modified) and the "revisionist" model (early patterns are continuously overwritten by new experiences). The data best supported the prototype model -- meaning that early attachment experiences create lasting tendencies, but these tendencies can be significantly modified through new relationship experiences, therapy, and deliberate practice.

Therapy Effectiveness for Insecure Attachment

The most encouraging attachment statistics come from therapy research. Emotionally Focused Therapy (EFT), developed by Dr. Sue Johnson and grounded explicitly in attachment theory, has been extensively studied and shows impressive results:

EFT research has demonstrated that therapy specifically increases attachment security and decreases attachment-related avoidance. These changes in attachment predict improvements in relationship satisfaction, suggesting that the attachment shift is the mechanism through which EFT works -- not just a side effect.

Beyond formal couples therapy, the concept of "earned security" -- developing secure attachment in adulthood despite insecure early experiences -- has been documented through multiple pathways. Research using the Adult Attachment Interview has identified earned secure individuals who achieved security through reflective processing of difficult childhood experiences, supportive romantic relationships, and other consistent corrective emotional experiences.

"Attachment theory doesn't just explain why we struggle in relationships. It explains what we can do about it. And the science is unequivocal: these patterns can change." -- Dr. Sue Johnson, developer of Emotionally Focused Therapy

Key Takeaways: Attachment Style Statistics at a Glance

Frequently Asked Questions

What is the most common attachment style?

Secure attachment is the most common attachment style. The Mickelson, Kessler, and Shaver (1997) nationally representative study found that 59% of American adults are securely attached. Other studies place the figure between 55% and 62%. This consistency across measurement methods (self-report questionnaires, clinical interviews) and populations strengthens confidence that the majority of adults are securely attached. For a deeper understanding, read our complete guide to attachment styles in relationships.

What percentage of people have an insecure attachment style?

Approximately 40-45% of adults have an insecure attachment style. Based on the Mickelson et al. (1997) national survey, roughly 25% are avoidant, 11% are anxious, and the remaining percentage falls into the disorganized/fearful-avoidant category. The Bakermans-Kranenburg and van IJzendoorn (2009) meta-analysis of over 10,000 Adult Attachment Interviews found similar proportions in non-clinical populations: 23% dismissing, 19% preoccupied, with additional unresolved classifications.

Can your attachment style change over time?

Yes. The Waters et al. (2000) 20-year longitudinal study found that 28% of participants changed their attachment classification from infancy to early adulthood. The Fraley (2002) meta-analysis found moderate stability (r = .39) across the first 19 years of life, best explained by a "prototype" model where early patterns persist but can be modified by experience. Attachment-based therapies like Emotionally Focused Therapy (EFT) have been shown to help 70-75% of distressed couples move to recovery.

How does attachment style affect relationship satisfaction?

Attachment style has a substantial impact on relationship satisfaction. The Li and Chan (2012) meta-analysis of 73 studies (21,602 participants) found that both attachment anxiety and avoidance are significantly and negatively associated with relationship quality. Avoidance was particularly damaging to feelings of connectedness and support. Securely attached individuals consistently report higher satisfaction, trust, commitment, and more constructive conflict patterns.

Is insecure attachment linked to divorce?

Yes. Research from the University of Arizona found that insecure attachment significantly predicts history of divorce. A longitudinal study tracking couples through the first 15 years of parenthood (PMC/NIH) found that attachment insecurity predicted both lower marital satisfaction and higher divorce risk. Both anxious and avoidant styles contribute through different mechanisms -- anxious attachment through escalating conflict, avoidant through emotional withdrawal.

Does insecure attachment affect mental health?

Yes. The Mickelson et al. (1997) national survey found insecure adults report significantly more psychological problems than secure adults. A review in World Psychiatry concluded that attachment insecurity is a "major contributor to mental disorders." Both anxious and avoidant attachment are associated with higher rates of depression and anxiety, though through different pathways -- anxious attachment through emotional reactivity and fear of rejection, avoidant through emotional suppression and social isolation.

What is earned secure attachment?

Earned secure attachment describes people who develop a secure attachment style in adulthood despite having insecure attachment experiences in childhood. Research using the Adult Attachment Interview identifies these individuals by their ability to reflect on difficult childhood experiences with coherence and balance. Earned security can develop through therapy, supportive romantic relationships, or other consistent corrective emotional experiences. Studies suggest earned secure adults function similarly to continuously secure adults in their relationships. Take the attachment style test for couples to better understand your current attachment patterns.

How effective is therapy for changing attachment styles?

Emotionally Focused Therapy (EFT), the most studied attachment-based couples therapy, shows strong results: 70-75% of couples move from distress to recovery, and approximately 90% show significant improvement. EFT demonstrates a large effect size (d = 0.93), and gains remain stable at 2-year follow-up. EFT specifically increases attachment security and decreases attachment-related avoidance. These findings are based on 13 randomized controlled trials reviewed in a systematic meta-analysis.

What is the Experiences in Close Relationships (ECR) scale?

The ECR is the most widely used self-report measure of adult attachment. Developed by Brennan, Clark, and Shaver (1998), it measures two continuous dimensions -- attachment anxiety (fear of rejection and abandonment) and attachment avoidance (discomfort with closeness and dependency). Unlike categorical measures, the ECR recognizes that attachment exists on a spectrum. A person's position on these two dimensions determines their attachment style: low on both = secure, high anxiety/low avoidance = anxious, low anxiety/high avoidance = avoidant, high on both = fearful-avoidant.

Want to understand how these statistics apply to your relationship? Start with our anxious attachment style test, or explore our complete guide to attachment styles in relationships.