Adverse Childhood Experiences Questionnaire

Abstract

The Adverse Childhood Experiences Questionnaire (ACE-Q) is one of the most widely utilized and influential epidemiological and clinical screening instruments in modern behavioral health, psychiatry, and preventive medicine. Developed in the mid-1990s as part of the landmark collaboration between the Centers for Disease Control and Prevention (CDC) and Kaiser Permanente, the instrument quantifies retrospective exposure to childhood stress, trauma, and domestic adversity occurring before the age of 18. The standard instrument comprises 10 dichotomously scored (Yes/No) items categorized into three primary domains: childhood abuse (emotional, physical, sexual), childhood neglect (emotional, physical), and household dysfunction (substance abuse, mental illness, intimate partner violence, parental separation or divorce, and familial incarceration).

Psychometrically, the ACE-Q functions as a cumulative risk index rather than a strictly reflective latent construct scale. Total scores range from 0 to 10, representing the aggregate number of distinct adversity categories experienced. Large-scale epidemiological and psychometric investigations, originating with a cohort of over 17,000 adult health plan members, demonstrate that the ACE-Q possesses robust test-retest reliability (Cohen’s kappa coefficients typically ranging from 0.45 to 0.86 across specific items), strong criterion validity, and exceptional predictive utility. Empirical findings establish a graded, dose-response relationship between cumulative ACE scores and a vast spectrum of negative adult outcomes, including major depressive disorder, post-traumatic stress disorder (PTSD), suicide attempts, substance use disorders, chronic obstructive pulmonary disease, ischemic heart disease, and premature mortality. This article provides an exhaustive psychometric, theoretical, and clinical review of the Adverse Childhood Experiences Questionnaire, detailing its structural validity, neurobiological underpinnings, clinical utility, scoring parameters, and verbatim measurement items.

Keywords

Adverse Childhood Experiences, ACE-Q, developmental trauma, toxic stress, psychometrics, cumulative risk index, childhood maltreatment, household dysfunction, allostatic load, trauma-informed care, psychiatric epidemiology, childhood abuse.

Authors

The original Adverse Childhood Experiences Study and its corresponding assessment methodology were conceived, designed, and executed by a collaborative multidisciplinary research team led by:

• Vincent J. Felitti, MD, FACP: Department of Preventive Medicine, Kaiser Permanente Medical Care Program, San Diego, California, USA.
• Robert F. Anda, MD, MS: Division of Adult and Community Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, USA.
• Dale F. Nordenberg, MD: Division of Birth Defects and Developmental Disabilities, National Center for Environmental Health, CDC, Atlanta, Georgia, USA.
• David F. Williamson, PhD: Division of Diabetes Translation, National Center for Chronic Disease Prevention and Health Promotion, CDC, Atlanta, Georgia, USA.
• Alison M. Spitz, MS, MPH: Division of Reproductive Health, National Center for Chronic Disease Prevention and Health Promotion, CDC, Atlanta, Georgia, USA.
• Valerie J. Edwards, PhD: Division of Adult and Community Health, National Center for Chronic Disease Prevention and Health Promotion, CDC, Atlanta, Georgia, USA.
• Mary P. Koss, PhD: Department of Family and Community Medicine, College of Medicine, University of Arizona, Tucson, Arizona, USA.
• James S. Marks, MD, MPH: National Center for Chronic Disease Prevention and Health Promotion, CDC, Atlanta, Georgia, USA.

Purpose

The primary purpose of the Adverse Childhood Experiences Questionnaire is to identify, categorize, and quantify an individual’s cumulative exposure to pervasive stressors and interpersonal trauma sustained during the first 18 years of life. Historically, medical and psychiatric research evaluated categories of trauma—such as physical abuse, sexual abuse, or parental addiction—as independent, isolated risk factors. The developers of the ACE-Q posited that these exposures rarely occur in isolation; rather, they exhibit marked clustering and multiplicative interactive effects within unstable caregiving ecologies. The instrument was intentionally engineered to serve as an epidemiological surveillance mechanism and a clinical risk-stratification measure capable of linking developmental adversity to the primary drivers of adult morbidity and mortality.

In clinical practice, the ACE-Q functions as a foundational tool within trauma-informed care (TIC) frameworks. By systematically inquiring about developmental stressors, clinicians across primary care, psychiatric, and social service settings can contextualize a patient’s emotional dysregulation, chronic health complaints, treatment non-adherence, or substance use as potential survival strategies and neurobiological adaptations to prolonged toxic stress. Screening with the ACE-Q allows healthcare professionals to differentiate between primary endogenous psychiatric pathologies and chronic neurodevelopmental adaptations to developmental trauma, thereby directly informing clinical formulation, psychotherapy approaches (e.g., eye movement desensitization and reprocessing, cognitive behavioral therapy for trauma), and psychopharmacological choices.

In public health and population research, the ACE-Q serves as a standardized metric for quantifying population-attributable risk. The measure enables researchers to evaluate the social determinants of health, investigate the intergenerational transmission of trauma, evaluate early childhood prevention programs, and model the financial and systemic impacts of child maltreatment on healthcare systems, carceral settings, and workforce productivity.

Psychological Construct

The construct assessed by the ACE-Q is developmental adversity, conceptualized as severe, recurring, or chronic environmental stressors occurring during critical windows of neurobiological and social development. The instrument operationalizes this overarching construct into 10 distinct, non-overlapping categorical indicators organized across three primary domains: childhood abuse, childhood neglect, and household dysfunction.

1. Childhood Abuse

The abuse domain encompasses active acts of commission perpetrated by parents, caregivers, or other household members that result in emotional, physical, or sexual harm:

• Emotional Abuse (Item 1): Pervasive, severe verbal hostility, denigration, insults, humiliation, or threats directed toward the child, generating persistent terror, feelings of worthlessness, or anticipatory fear of physical harm.
• Physical Abuse (Item 2): Bodily assault inflicted by a caregiver, operationally defined as pushing, grabbing, slapping, throwing objects, or hitting with sufficient force to cause physical injury, cutaneous marks, or severe pain.
• Sexual Abuse (Item 3): Unwanted sexual contact, molestation, fondling, or coerced oral, anal, or vaginal penetration perpetrated by an adult or an individual at least five years older than the child, violating bodily autonomy and developmental boundaries.

2. Childhood Neglect

Neglect denotes acts of omission wherein caregivers fail to provide the fundamental provisions and relational safety required for normative human maturation:

• Emotional Neglect (Item 4): Relational abandonment, lack of emotional reciprocity, and the chronic absence of warmth, validation, affection, or familial solidarity, leaving the developing child feeling unloved, unimportant, or isolated.
• Physical Neglect (Item 5): Systemic failure to provide basic physiological necessities, such as adequate nutrition, clean clothing, medical treatment, and physical protection, frequently secondary to caregiver incapacitation due to substance abuse or chronic disorganization.

3. Household Dysfunction

Household dysfunction captures ecological instability and systemic environmental stressors within the child’s proximate family unit, compromising caregiver availability and environmental safety:

• Parental Separation or Divorce (Item 6): Marital dissolution, abandonment, or structural disruption of the parental dyad, resulting in emotional distress, economic instability, or chronic custodial conflict.
• Intimate Partner Violence / Mother Treated Violently (Item 7): Witnessing domestic abuse inflicted upon a maternal caregiver, ranging from verbal coercion and slapping to weapon threats and severe physical beatings.
• Household Substance Abuse (Item 8): Living with a primary caregiver or cohabitant who meets criteria for alcoholism, problem drinking, or illicit drug abuse, creating an erratic, neglectful, and unpredictable home environment.
• Household Mental Illness (Item 9): Co-residence with a family member suffering from severe psychiatric disorders, major depression, or who engages in suicidal behaviors or completed suicide.
• Incarcerated Household Member (Item 10): The arrest and prolonged imprisonment of a parent or household member, which induces profound stigma, attachment rupture, financial distress, and developmental discontinuity.

Theoretical Framework

The theoretical architecture undergirding the Adverse Childhood Experiences Questionnaire synthesizes principles from life course epidemiology, allostatic load theory, attachment theory, and developmental neurobiology. Central to this framework is the toxic stress model articulated by the National Scientific Council on the Developing Child and researchers such as Jack Shonkoff.

Under normative developmental conditions, physiological stress responses (characterized by temporary increases in heart rate and mild elevations in neuroendocrine hormones) are buffered by supportive, responsive caregiving relationships. In contrast, toxic stress occurs when a child experiences strong, frequent, or prolonged activation of the body’s stress response systems in the absence of the buffering protection of adult support. The sustained release of stress mediators—specifically cortisol, epinephrine, and pro-inflammatory cytokines—disrupts the architecture of the developing brain. Key structures vulnerable to toxic stress include the amygdala (resulting in chronic hypervigilance and fear conditioning), the hippocampus (impairing memory consolidation and glucocorticoid negative feedback), and the prefrontal cortex (attenuating executive functioning, impulse control, and emotional regulation).

Concurrently, Bruce McEwen’s paradigm of allostatic load explains the physiological wear and tear that accumulates across bodily systems when mediators of the stress response remain chronically active. The ACE model posits that early ecological trauma initiates a cascade of developmental consequences: disrupted neurodevelopment leads to social, emotional, and cognitive impairments; these deficits prompt the adoption of health-risk behaviors (e.g., smoking, binge drinking, overeating, substance dependence) as maladaptive coping mechanisms or self-medication strategies; these behaviors subsequently produce chronic disease, disability, social problems, and ultimately early mortality.

Validity

The psychometric validity of the ACE-Q has been demonstrated across dozens of large-scale international epidemiological cohorts, encompassing hundreds of thousands of participants:

Predictive and Criterion Validity

The hallmark of the ACE-Q is its pronounced predictive validity, characterized by a monotonic, graded dose-response relationship between cumulative ACE exposure and adult morbidity. In the seminal CDC-Kaiser study (Felitti et al., 1998; Anda et al., 2006) involving 17,337 adult respondents, individuals with an ACE score of 4 or higher, compared to those with an ACE score of 0, exhibited:

• A 4.6-fold increase in the risk of clinical depression.
• A 12.2-fold increase in lifetime suicide attempts.
• A 7.4-fold increased risk for self-reported alcoholism.
• A 10.3-fold increased risk for illicit intravenous drug use.
• A 2.4-fold increase in ischemic heart disease and a 3.9-fold increase in chronic obstructive pulmonary disease (COPD).

Individuals with an ACE score of 6 or greater were found to experience a lifespan shortened by an average of 20 years compared to peers with zero ACEs.

Construct and Convergent Validity

Construct validity is substantiated through convergent associations with validated psychometric measures of childhood trauma and adult psychiatric distress. The ACE-Q exhibits strong positive correlations with the Childhood Trauma Questionnaire (CTQ), demonstrating convergent coefficients ranging from r = .62 to .78 across corresponding abuse and neglect domains. Furthermore, ACE scores demonstrate significant convergence with standardized measures of emotional dysregulation, borderline personality traits, and trauma symptom indices (such as the Trauma Symptom Checklist-40 and the PCL-5).

Discriminant Validity

Discriminant validity has been demonstrated by showing that while ACE scores robustly predict stress-mediated, lifestyle-linked, and psychiatric conditions, they do not uniformly correlate with disorders lacking stress-mediated etiologies, such as strictly Mendelian genetic disorders, demonstrating that the questionnaire does not merely measure non-specific somatization or general complaint tendencies.

Reliability

The reliability of retrospective childhood adversity reports has been a central topic in psychiatric epidemiology. Methodological studies evaluating the ACE-Q confirm high stability over time, demonstrating that recall bias does not invalidate the measure:

Test-Retest Reliability

In a dedicated methodological investigation within the CDC-Kaiser cohort, Dube et al. (2004) assessed the test-retest reliability of the ACE questions over intervals ranging from several months to several years. Kappa coefficients (κ) across the individual categories demonstrated moderate to substantial agreement:

• Substance abuse in the household: κ = 0.76
• Incarcerated household member: κ = 0.86
• Parental divorce/separation: κ = 0.85
• Sexual abuse: κ = 0.69
• Physical abuse: κ = 0.55
• Emotional abuse: κ = 0.45

The total ACE score demonstrated high test-retest stability (intraclass correlation coefficient [ICC] = 0.64 to 0.72), indicating that an individual’s classification along cumulative risk strata remains consistent over extended periods.

Internal Consistency and Scale Nature

Because the ACE-Q is constructed as a formative, cumulative environmental risk index rather than an internal reflective scale, conventional indicators of internal consistency (such as Cronbach’s alpha) must be interpreted with caution. The occurrence of one type of adversity (e.g., household incarceration) does not conceptually require or represent the same underlying psychological trait as another (e.g., sexual abuse). Nonetheless, when evaluated using classical test theory parameters, the 10 items demonstrate acceptable internal consistency, with Kuder-Richardson Formula 20 (KR-20) coefficients and ordinal alpha values generally clustering between .70 and .82 across diverse clinical and community cohorts.

Factor Analysis

Extensive psychometric investigations have examined the latent structure of the Adverse Childhood Experiences Questionnaire to determine whether adverse exposures are best understood as unidimensional, multidimensional, or hierarchical:

Exploratory and Confirmatory Factor Structures

Structural equation modeling and confirmatory factor analysis (CFA) across diverse international populations (e.g., Ford et al., 2014; Afifi et al., 2020) consistently demonstrate that the 10 ACE-Q items do not fit a strictly unidimensional reflective model. Instead, comparative fit evaluations consistently support two-factor and three-factor correlated models:

• The Two-Factor Model: Divides items into (1) Direct Maltreatment / Interpersonal Abuse and Neglect (emotional, physical, sexual abuse, and neglect items) and (2) Household Dysfunction / Environmental Adversity (substance use, mental illness, domestic violence, parental separation, incarceration). This model routinely exhibits adequate goodness-of-fit indices (CFI > .94, TLI > .92, RMSEA < .05).
• The Three-Factor Model: Deconstructs the scale into (1) Abuse (Items 1, 2, 3), (2) Neglect (Items 4, 5), and (3) Household Dysfunction (Items 6, 7, 8, 9, 10). In numerous contemporary CFA studies, this model demonstrates superior fit indices (Comparative Fit Index [CFI] ≥ .96, Tucker-Lewis Index [TLI] ≥ .95, Root Mean Square Error of Approximation [RMSEA] ≤ .042, Standardized Root Mean Square Residual [SRMR] ≤ .038).

Bifactor and Formative Formulations

Recent psychometric research has evaluated bifactor models consisting of a general “Developmental Adversity” factor (explaining the shared variance across all 10 items) alongside specific group factors (abuse, neglect, and dysfunction). These models show that while the general adversity factor accounts for the shared risk driving severe adult health outcomes, the unique sub-factors preserve incremental validity for specific diagnostic presentations (e.g., sexual abuse loading heavily on dissociative and sexual dysfunction profiles, neglect loading on interpersonal and attachment pathologies).

Instrument / Measurement Tool

The structural characteristics, administration protocols, and scoring guidelines for the Adverse Childhood Experiences Questionnaire are outlined below:

• Test Type: Retrospective self-report questionnaire / structured clinical interview.
• Primary Target Population: Adults (aged 18 and older) reporting on childhood exposures before age 18; adapted versions exist for adolescents and parent-proxy reporting.
• Number of Items: 10 dichotomously scored questions.
• Response Scale: Dichotomous (Yes / No).
• Administration Time: Approximately 3 to 5 minutes for self-administration; 5 to 10 minutes when administered in an interview format.
• Scoring Methodology:
  • Each endorsed “Yes” response is assigned a score of 1 point.
  • Each “No” response is assigned a score of 0 points.
  • Items within each category are aggregated; endorsing any element within a category results in 1 point for that respective category.
  • Total cumulative score is calculated by summing across all 10 categories, yielding an overall ACE Score ranging from 0 to 10.
• Clinical Stratification and Cut-offs:
  • Score of 0: Unexposed reference group.
  • Score of 1 to 3: Low to moderate cumulative exposure; elevated risk for specific health-risk behaviors and stress-related conditions.
  • Score of ≥ 4: Clinically significant threshold; high cumulative trauma exposure associated with steep escalations in chronic physical illness, psychiatric disorders, substance abuse, and premature mortality.

Permissions & Fee and Test Year

The original Adverse Childhood Experiences Questionnaire was developed between 1995 and 1997 and published in the primary literature in 1998 (Felitti et al., 1998) through a research initiative funded by the Centers for Disease Control and Prevention and Kaiser Permanente. As an instrument produced in part through United States federal government sponsorship and disseminated as a public health instrument, the original 10-item ACE survey resides in the public domain.

No licensing fees, commercial royalties, or formal institutional permissions are required for clinicians, researchers, non-profit institutions, or public health bodies to utilize, administer, or integrate the standard 10-item questionnaire into clinical records or scientific protocols. Clinicians and researchers must cite the original landmark publication (Felitti et al., 1998) when referencing the instrument. Clinicians should ensure trauma-informed safeguards, psychological resources, and appropriate clinical debriefing when administering the scale to vulnerable populations, given the potential for recalling distressing experiences.

References

• Afifi, T. O., Taillieu, T., Salmon, S., Davila, I. G., Stewart-Tufescu, A., Fortier, J., Driedger, M., & MacMillan, H. L. (2020). Adverse childhood experiences (ACEs) and physical and mental health conditions: Validating the factor structure of ACEs in a population-based sample. Child Abuse & Neglect, 107, Article 104598. https://doi.org/10.1016/j.chiabu.2020.104598
• Anda, R. F., Fleisher, V. I., Felitti, V. J., Edwards, V. J., Whitfield, C. L., Dube, S. R., & Williamson, D. F. (2004). Childhood abuse, household dysfunction, and indicators of impaired adult worker performance. The Permanente Journal, 8(1), 30–38. https://doi.org/10.7812/TPP/03-089
• Anda, R. F., Felitti, V. J., Bremner, J. D., Walker, J. D., Whitfield, C., Perry, B. D., Dube, S. R., & Giles, W. H. (2006). The enduring effects of abuse and related adverse experiences in childhood: A convergence of evidence from neurobiology and epidemiology. European Archives of Psychiatry and Clinical Neuroscience, 256(3), 174–186. https://doi.org/10.1007/s00406-005-0624-4
• Centers for Disease Control and Prevention. (2010). Adverse childhood experiences reported by adults—Five states, 2009. Morbidity and Mortality Weekly Report (MMWR), 59(49), 1609–1613. https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5949a1.htm
• Dube, S. R., Anda, R. F., Felitti, V. J., Chapman, D. P., Williamson, D. F., & Giles, W. H. (2001). Childhood abuse, household dysfunction, and the risk of attempted suicide throughout the life span: Findings from the Adverse Childhood Experiences Study. JAMA, 286(24), 3089–3096. https://doi.org/10.1001/jama.286.24.3089
• Dube, S. R., Felitti, V. J., Dong, M., Giles, W. H., & Anda, R. F. (2003). The impact of adverse childhood experiences on health problems in adulthood: Does the type of childhood trauma matter? Child Abuse & Neglect, 27(11), 1279–1296. https://doi.org/10.1016/j.chiabu.2003.09.009
• Dube, S. R., Williamson, D. F., Thompson, T., Felitti, V. J., & Anda, R. F. (2004). Assessing the reliability of retrospective reports of adverse childhood experiences among adult HMO members attending a primary care clinic. Annals of Epidemiology, 14(10), 729–734. https://doi.org/10.1016/j.annepidem.2004.03.001
• Edwards, V. J., Anda, R. F., Gu, D., Dube, S. R., & Felitti, V. J. (2007). Adverse childhood experiences and smoking persistence in adults with smoking-related symptoms and illness. The Permanente Journal, 11(2), 5–13. https://doi.org/10.7812/TPP/06-136
• Felitti, V. J., Anda, R. F., Nordenberg, D., Williamson, D. F., Spitz, A. M., Edwards, V., Koss, M. P., & Marks, J. S. (1998). Relationship of childhood abuse and household dysfunction to many of the leading causes of death in adults: The Adverse Childhood Experiences (ACE) Study. American Journal of Preventive Medicine, 14(4), 245–258. https://doi.org/10.1016/S0749-3797(98)00017-8
• Ford, E. S., Anda, R. F., Edwards, V. J., Perry, G. S., Zhao, G., Li, C., & Croft, J. B. (2011). Adverse childhood experiences and smoking status in five states. Preventive Medicine, 53(3), 188–193. https://doi.org/10.1016/j.ypmed.2011.06.015
• Ford, D. C., Merrick, M. T., Parks, S. E., Breiding, M. J., Anderson, K. N., & Metzler, M. (2014). Factor structure of adverse childhood experiences: A structural equation modeling approach. American Journal of Preventive Medicine, 47(6), 841–848. https://doi.org/10.1016/j.amepre.2014.07.050
• Hillis, S. D., Anda, R. F., Dube, S. R., Felitti, V. J., Marchbanks, P. A., & Marks, J. S. (2004). The association between adverse childhood experiences and adolescent pregnancy, long-term psychosocial consequences, and fetal death. Pediatrics, 113(2), 320–327. https://doi.org/10.1542/peds.113.2.320
• Hughes, K., Bellis, M. A., Hardcastle, K. A., Sethi, D., Butchart, A., Mikton, C., Jones, L., & Dunne, M. P. (2017). The effect of multiple adverse childhood experiences on health: A systematic review and meta-analysis. The Lancet Public Health, 2(8), e356–e366. https://doi.org/10.1016/S2468-2667(17)30118-4
• McEwen, B. S. (1998). Stress, adaptation, and disease: Allostasis and allostatic load. Annals of the New York Academy of Sciences, 840(1), 33–44. https://doi.org/10.1111/j.1749-6632.1998.tb09546.x
• Nurius, P. S., Logan-Greene, P., & Green, S. (2012). ACEs within a lifecourse perspective: Implications for practice and policy. Social Work in Mental Health, 10(2), 99–114. https://doi.org/10.1080/15332985.2011.606240
• Patterson, M. L., Moniruzzaman, A., & Somers, J. M. (2014). History of adverse childhood experiences among homeless adults with mental illness: Results from the At Home/Chez Soi study. Social Psychiatry and Psychiatric Epidemiology, 49(11), 1781–1790. https://doi.org/10.1007/s00127-014-0887-5
• Ramiro, L. S., Madrid, B. J., & Brown, D. W. (2010). Adverse childhood experiences (ACE) and health-risk behaviors among adults in a developing country setting. Child Abuse & Neglect, 34(11), 842–855. https://doi.org/10.1016/j.chiabu.2010.02.012
• Raposo, S. M., Mackenzie, C. S., Henriksen, C. A., & Afifi, T. O. (2014). Time does not heal all wounds: Older adults who experienced childhood adversities have higher odds of mood, anxiety, and personality disorders. The American Journal of Geriatric Psychiatry, 22(11), 1241–1250. https://doi.org/10.1016/j.jagp.2013.04.009
• Rothman, E. F., Bernstein, J., & Strunin, L. (2010). Why might adverse childhood experiences lead to a greater risk of intimate partner violence perpetration? Findings from a qualitative study with young adult men. Violence and Victims, 25(3), 360–374. https://doi.org/10.1891/0886-6708.25.3.360
• Shonkoff, J. P., Garner, A. S., Siegel, B. S., Dobbins, M. I., Earls, M. F., McGuinn, L., Pascoe, J., & Wood, D. L. (2012). The lifelong effects of early childhood adversity and toxic stress. Pediatrics, 129(1), e232–e246. https://doi.org/10.1542/peds.2011-2663

Items of the Scale