Anorexia Nervosa Stages Of Change Questionnaire

Abstract

The Anorexia Nervosa Stages of Change Questionnaire (ANSOCQ or ANSOC-Q) is a multidimensional, self-report psychometric instrument developed to assess readiness and motivation to recover in individuals suffering from anorexia nervosa. Grounded in the Transtheoretical Model (TTM) of behavior change pioneered by James O. Prochaska and Carlo DiClemente, the instrument addresses the pervasive clinical challenge of ego-syntonicity and treatment ambivalence characteristic of restrictive eating disorders. The questionnaire comprises 20 clinical items (frequently administered in psychometric batteries as 19 or 20 core symptom domains), each providing five ordered statements reflecting the discrete TTM stages of change: Precontemplation (stage score 1), Contemplation (stage score 2), Preparation (stage score 3), Action (stage score 4), and Maintenance (stage score 5). The target constructs span core behavioral, somatic, and cognitive dimensions of anorexia nervosa, including weight restoration, body weight targets, shape and weight salience, fear of weight gain, restrictive eating patterns, ritualized mealtime behaviors, compensatory weight control practices, and associated psychological features such as perfectionism and interpersonal functioning. Psychometric evaluations across inpatient, day-program, and outpatient clinical populations have demonstrated exceptional internal consistency (Cronbach’s alpha ranging from .90 to .95), robust two-week test-retest reliability ($r = .89$ to $.93$), and solid construct, convergent, and predictive validity. Specifically, ANSOCQ scores reliably correlate with independent clinician ratings of motivation (such as the Stages of Change Interview for Anorexia Nervosa; Anorexia Nervosa Stages of Change Interview) and prospectively predict therapeutic engagement, symptomatic reduction, caloric normalization, body mass index (BMI) gain, and premature discharge or treatment dropout. This paper delivers an exhaustive academic analysis of the ANSOCQ, reviewing its theoretical architecture, psychometric properties, factor structure, clinical scoring procedures, and complete authentic item inventory.

Keywords

Anorexia Nervosa Stages of Change Questionnaire, ANSOCQ, anorexia nervosa, Transtheoretical Model, readiness to recover, motivation to change, eating disorders, ego-syntonicity, psychometrics, treatment adherence

Authors

The Anorexia Nervosa Stages of Change Questionnaire was developed by an Australian clinical research team led by Dr. Elizabeth Rieger in collaboration with prominent clinician-scientists at the University of Sydney, Royal Prince Alfred Hospital, and Westmead Hospital. The original instrument validation study was published in 2000:

• Elizabeth Rieger, Ph.D. — School of Psychology, University of Sydney, and Department of Psychological Medicine, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia; currently Professor of Clinical Psychology at the Australian National University (ANU), Canberra, Australia. Specialization: eating disorder psychopathology, motivation to change, and obesity interventions.
• Stephen W. Touyz, Ph.D. — Emeritus Professor of Clinical Psychology, School of Psychology, University of Sydney; Co-Director of the InsideOut Institute for Eating Disorders, Sydney, Australia. Renowned international authority on severe and enduring anorexia nervosa (SE-AN).
• Dirk Schotte, Ph.D. — Clinical Psychologist, Department of Psychological Medicine, Royal Prince Alfred Hospital, Sydney, Australia.
• Pierre J. V. Beumont, M.B.Ch.B., M.Phil., FRACP, FRCPsych (1937–2003) — Foundation Professor of Psychiatry, University of Sydney; pioneer of eating disorder research and treatment paradigms in Australasia.
• Janice Russell, M.B.B.S., MD, FRANZCP — Clinical Professor of Psychiatry, Royal Prince Alfred Hospital and University of Sydney. Specialist in medical complications and refeeding management in severe eating disorders.
• Simon Clarke, M.B.B.S., FRACP — Adolescent and Young Adult Physician, Adolescent Medicine Unit, The Children’s Hospital at Westmead, Sydney, Australia.
• Michael R. Kohn, M.B.B.S., FRACP — Staff Specialist in Adolescent Medicine, The Children’s Hospital at Westmead, and Associate Professor, University of Sydney.
• Rosalyn Griffiths, Ph.D. — Clinical Psychologist, Royal Prince Alfred Hospital and University of Sydney, Australia.

Purpose

The primary clinical and empirical objective of the Anorexia Nervosa Stages of Change Questionnaire (ANSOCQ) is to quantify a patient’s self-reported readiness and motivation to recover across the distinct physical, affective, and behavioral symptoms of anorexia nervosa. Anorexia nervosa has long presented one of the most formidable dilemmas in psychiatric medicine due to its pronounced ego-syntonic quality: emaciation, dietary restriction, and relentless somatic monitoring are frequently experienced by the individual not as distressing pathology, but as primary sources of pride, perceived control, self-efficacy, and identity. Consequently, individuals routinely present to medical settings under familial, social, or physiological coercion, displaying profound ambivalence or active resistance toward refeeding, weight restoration, and psychotherapeutic interventions.

Prior to the introduction of the ANSOCQ, clinicians and clinical trialists lacked an objective, standardized, disorder-specific questionnaire capable of capturing readiness for change across diverse symptom facets. Generic motivational scales (such as the University of Rhode Island Change Assessment; URICA) yielded broad assessments of change orientation that frequently failed to isolate the compartmentalized nature of eating pathology. For instance, an individual might actively desire reduction of distressing mealtime anxiety or interpersonal conflict (Action stage), while simultaneously remaining entirely opposed to somatic weight gain or dietary fat reintroduction (Precontemplation stage). The ANSOCQ was purpose-built to address this structural limitation by deconstructing the clinical presentation of anorexia nervosa into distinct behavioral and cognitive domains.

In clinical practice, the ANSOCQ fulfills several critical functions:

• Treatment Matching and Tailoring: Establishing whether an individual requires motivational interviewing techniques designed to resolve ambivalence and raise consciousness (for Precontemplation and Contemplation stages) versus directive behavioral and cognitive-behavioral interventions targeting active skill implementation and food exposure (for Preparation and Action stages).
• Rupture Prevention: Preventing therapeutic impasses caused by clinicians imposing action-oriented weight-gain goals upon patients who reside psychologically in early precontemplative states.
• Dropout and Attrition Forecasting: Identifying patients at high risk for premature departure from intensive day-patient or inpatient refeeding programs, allowing multidisciplinary teams to introduce pre-emptive motivational scaffolding.
• Outcome Monitoring: Serving as a continuous, sensitive measure of internal psychological shifts that occur alongside, or independently of, physiological weight gain during hospitalization or ambulatory psychotherapy.

In research contexts, the ANSOCQ functions as an essential mediator and moderator variable in randomized controlled trials (RCTs) assessing cognitive-behavioral therapy (CBT), the Maudsley Model of Anorexia Nervosa Treatment for Adults (MANTRA), Specialist Supportive Clinical Management (SSCM), and family-based treatment (FBT).

Psychological Construct

The core psychological construct measured by the ANSOCQ is stage of change or readiness to recover as conceptualized within the Transtheoretical Model, applied explicitly to the multidimensional clinical features of anorexia nervosa. Unlike unitary affective states or trait variables, readiness to recover is dynamic, domain-specific, and behavioral in nature. The construct operationalizes an individual’s temporal positioning along a five-stage motivational continuum with respect to each primary pathological dimension of the disorder:

1. Precontemplation (Stage 1)

In this stage, the individual exhibits complete absence of intention to alter the target symptom or behavior in the foreseeable future (typically framed as within the next six months). Anorexic behaviors are experienced as ego-syntonic, vital for emotional stabilization, or objectively benign. The patient denies personal risk, defends low weight as normal or desirable, actively avoids weight increase, and dismisses concerns voiced by family members or medical practitioners. For example, regarding weight restoration, a precontemplative response posits: “As far as I am concerned, I do not need to gain weight.”

2. Contemplation (Stage 2)

The contemplation stage signifies the emergence of awareness and cognitive ambivalence. The individual recognizes that a problem exists, acknowledges some of the severe physiological, psychological, or interpersonal costs of starvation, and considers the prospective advantages of change. However, this awareness is offset by intense distress regarding loss of control, fear of adiposity, and profound reluctance to abandon core eating disorder functions. The person is actively weighing the pros and cons of recovery but has made no firm commitment to take action. For example: “In some ways I think that I might be better off if I gained weight.”

3. Preparation (Stage 3)

Preparation represents an explicit intention to undertake behavioral modification in the immediate future (conventionally within the next month). Cognitive ambivalence has predominantly shifted toward prioritizing recovery, and the individual makes concrete decisions to begin challenging eating disorder rules, adjusting dietary intake, or confronting target weight thresholds. Small behavioral steps may already be under exploration, although sustained execution has not yet commenced. For example: “I have decided that I will attempt to gain weight.”

4. Action (Stage 4)

The action stage reflects active, overt behavioral and cognitive modification. During this stage, the individual mobilizes significant time, mental energy, and behavioral effort to alter their habits, consume prescribed meal plans, face fear foods, limit compensatory rituals, and reach target physiological metrics. Because action demands substantial counter-regulation against conditioned anorexic anxiety, it carries elevated subjective distress. For example: “At the moment I am putting in a lot of effort into gaining weight.”

5. Maintenance (Stage 5)

The maintenance stage denotes the consolidation of gains achieved during the action phase and the systematic prevention of relapse. The individual works to stabilize normal body weight, preserve normalized and flexible dietary regimens, sustain realistic cognitive appraisals of body shape, and manage potential triggers without reverting to starvation or purging rituals. The focus shifts from initiating novel behaviors to sustaining long-term behavioral integration. For example: “I am working to maintain the weight gains I have made.”

Construct Subdimensions in the ANSOCQ

The ANSOCQ integrates these five motivational states across three overarching symptom clusters recognized in eating disorder psychopathology:

• Weight and Shape Restoration: Willingness to gain weight, attain a medically safe minimum target BMI, accept body fat accumulation versus muscle mass, endure localized adipose distribution (e.g., hips, abdomen), and challenge strict aesthetic shape benchmarks.
• Dietary and Cognitive Normalization: Readiness to abandon rigid calorie counting, cease avoidance of feared macronutrients (fats, carbohydrates, dairy), consume structured thrice-daily meals and snacks, and curtail obsessive ruminations about food, body shape, and exercise energy balance.
• Eating Psychopathology, Compensatory Rituals, and Psychological Correlates: Willingness to eradicate mealtime behavioral rituals (prolonged chewing, food dissection, pacing), mitigate guilt-laden emotional responses to nutritional consumption, terminate purging and compulsive over-exercising, and confront underlying characterological maintenance factors such as clinical perfectionism, low self-esteem, over-control, and relational estrangement.

Theoretical Framework

The architectural foundation of the ANSOCQ is the Transtheoretical Model of Health Behavior Change (TTM), originally synthesized by James O. Prochaska and Carlo DiClemente in the late 1970s and early 1980s. Emerging from integrative comparative analyses of major psychotherapeutic systems (including psychodynamic, humanistic, behavioral, and cognitive orientations), the TTM posits that health-related behavioral change is not a dichotomous, all-or-nothing event, but rather a cyclical, developmental progression through qualitatively distinct stages.

In traditional psychiatric models, patient non-compliance was frequently attributed to characterological resistance, lack of insight, or personality pathology. The TTM radically reconceptualized resistance as a predictable clinical mismatch between the clinician’s therapeutic stance and the client’s current stage of change. When clinicians mandate behavioral modifications (e.g., refeeding prescriptions) for individuals in Precontemplation, severe therapeutic ruptures, overt rejection of care, and treatment refusal predictably ensue.

The adaptation of the TTM to anorexia nervosa by Rieger and colleagues required critical theoretical refinements:

• Domain-Specific Staging: In substance abuse or smoking cessation (where the TTM was first validated), the target behavior is predominantly unidimensional (e.g., cessation of tobacco consumption). In stark contrast, anorexia nervosa is a complex neuropsychiatric disorder comprising conflicting behavioral, cognitive, affective, and physiological vectors. An individual may simultaneously reside in the Action stage regarding physical medical check-ups, the Contemplation stage regarding feared carbohydrate consumption, and the absolute Precontemplation stage regarding restoration of a normal body mass index. The ANSOCQ theoretically operationalizes this domain specificity by evaluating readiness across each distinct pathological feature.
• Decisional Balance: Prochaska’s model emphasizes the role of the “pros” (perceived benefits) and “cons” (perceived costs) of change. In early anorexia nervosa, the perceived pros of the disorder (sense of purity, mastery, emotional numbing, positive reinforcement from physical thinness) vastly outweigh the cons. Movement into Contemplation and Preparation necessitates an internal tipping of this decisional balance, where the medical, emotional, and social consequences become progressively recognized as intolerable.
• Processes of Change: The TTM delineates ten experiential and behavioral processes that drive movement across stages (such as consciousness-raising, dramatic relief, self-reevaluation, counterconditioning, and stimulus control). The ANSOCQ serves as the diagnostic substrate informing clinicians which processes must be targeted. For instance, consciousness-raising and environmental reevaluation must precede behavioral counterconditioning.

Validity

The psychometric validity of the ANSOCQ has been rigorously established across numerous independent investigations in Australia, North America, Europe, and Asia, encompassing adult and adolescent clinical cohorts across inpatient, residential, partial hospitalization, and outpatient care pathways.

Construct and Convergent Validity

Construct validity was initially demonstrated in the seminal study by Rieger et al. (2000), wherein ANSOCQ global and subscale scores exhibited strong convergent correlations with established motivational measures. The ANSOCQ correlated significantly with clinician-administered instruments, including the Stages of Change Interview for Anorexia Nervosa ($r = .65$ to $.78, p < .001$), demonstrating that patients’ self-reported stage classifications align closely with thorough, semi-structured expert diagnostic evaluations.

Furthermore, convergent validity is evidenced by robust inverse correlations with eating disorder psychopathology as measured by the Eating Disorder Examination Questionnaire (EDE-Q) and the Eating Disorder Inventory (EDI). Higher stages of change (reflecting Action and Maintenance) correlate significantly with lower levels of dietary restraint, reduced shape concern, decreased weight concern, and lower drive for thinness ($r = -.42$ to $-.61, p < .001$). Importantly, the ANSOCQ shows positive associations with general measures of psychological functioning, such as self-esteem and perceived quality of life, confirming that readiness to recover is intertwined with broader psychological resilience.

Predictive and Clinical Validity

The clinical utility of the ANSOCQ is underscored by its ability to prospectively predict critical clinical outcomes:

• Treatment Completion and Dropout: In both inpatient and specialized outpatient treatment settings, baseline ANSOCQ scores reliably predict program completion. Patients entering treatment in Precontemplation or early Contemplation exhibit significantly higher rates of premature treatment dropout and discharge against medical advice compared to those in Preparation or Action stages (odds ratios ranging from 2.4 to 3.8).
• Rate of Weight Gain during Inpatient Refeeding: Studies by Rieger et al. (2000, 2002) and subsequent international replications have documented that baseline ANSOCQ scores account for a statistically significant proportion of variance in weekly weight gain among hospitalized patients. Higher readiness scores predict faster achievement of target discharge weight and shorter lengths of stay.
• Long-Term Symptom Remission: Longitudinal assessments at 6- and 12-month post-discharge follow-ups reveal that post-treatment ANSOCQ scores are powerful predictors of sustained recovery, whereas low motivational scores at discharge correlate strongly with rapid relapse and psychiatric re-admission.

Discriminant Validity

The ANSOCQ exhibits strong discriminant validity. While it correlates moderately with general indices of depression and anxiety (e.g., Beck Depression Inventory, BDI; State-Trait Anxiety Inventory, STAI)—reflecting the known distress associated with severe starvation—multivariate regression analyses demonstrate that the ANSOCQ accounts for substantial unique variance in eating disorder outcomes after controlling for general negative affectivity. Moreover, the scale successfully discriminates between clinical subtypes of anorexia nervosa (restricting type vs. binge-eating/purging type) across specific subdomains, capturing distinct motivational profiles regarding purging cessation versus caloric reintroduction.

Reliability

The psychometric reliability of the ANSOCQ has been comprehensively evaluated across multiple clinical trials, establishing high internal consistency, strong temporal stability, and minimal measurement error.

Internal Consistency

In the original validation study by Rieger et al. (2000), conducted with female patients diagnosed with DSM-IV anorexia nervosa, the full instrument demonstrated exceptional overall internal consistency, with a Cronbach’s alpha of $\alpha = .92$. Subsequent replications across diverse multinational samples have consistently substantiated this finding:

• Inpatient adult cohorts: $\alpha = .90$ to $.94$
• Adolescent anorexia nervosa populations: $\alpha = .89$ to $.93$
• Outpatient and partial hospitalization programs: $\alpha = .91$ to $.95$

Individual subscale internal consistencies remain similarly robust, typically ranging from $\alpha = .78$ to $.89$, confirming that each thematic symptom cluster functions as a coherent, homogeneous psychometric dimension.

Test-Retest Reliability

Temporal stability was investigated by administering the ANSOCQ to clinically stable eating disorder patients across short-term test-retest intervals (ranging from 3 to 14 days) in the absence of major therapeutic interventions. The overall intraclass correlation coefficient (ICC) and Pearson correlation coefficients yielded values between $r = .89$ and $r = .93$ ($p < .001$). These figures demonstrate that the scale is highly stable over short durations, ensuring that measured shifts during active interventions reflect genuine clinical progression rather than test-retest instability.

Inter-Item and Item-Total Correlations

Corrected item-total correlations across the questionnaire items consistently exceed the psychometric benchmark of .40, with most items falling between .52 and .76. These metrics confirm that every individual symptom domain contributes meaningfully to the overall readiness-to-recover construct without excessive redundancy.

Factor Analysis

Extensive exploratory factor analyses (EFA) and confirmatory factor analyses (CFA) have been conducted to delineate the internal structural architecture of the ANSOCQ.

Exploratory Factor Structure

In the initial psychometric derivation by Rieger and colleagues, principal component analysis (PCA) with varimax rotation was performed. While the instrument was primarily constructed to provide an overall composite readiness score (as well as individual item profiles), factor extraction revealed a clear multidimensional underlying structure. Most empirical studies identify a reliable three-factor solution accounting for approximately 58% to 65% of the total variance:

1. Factor 1: Weight and Shape Concerns (Weight Restoration): Encompassing items assessing attitudes toward gaining weight, body weight targets, localized weight distribution, appearance satisfaction at normal weight, health risks of emaciation, fear of fatness, and rate of weight gain. Items load heavily on this factor with coefficients typically ranging from .61 to .84.
2. Factor 2: Eating, Feeding, and Food Avoidance (Dietary Normalization): Capturing items related to feared food avoidance, daily consumption of three regular meals and snacks, time spent obsessively thinking about food and calories, and ritualistic mealtime behaviors. Factor loadings range from .58 to .81.
3. Factor 3: Compensatory Methods and Associated Psychopathology: Comprising items addressing weight-control practices (restricting, compulsive exercise, vomiting, laxatives) alongside broader psychological vulnerabilities including perfectionism, low self-esteem, need for control, and relationship difficulties. Factor loadings range from .50 to .75.

Confirmatory Factor Analysis (CFA) Fit Indices

Subsequent structural evaluations applying CFA to clinical cohorts have confirmed adequate to excellent model fit for the correlated three-factor structural model. Typical fit indices reported across the psychometric literature include:

• Comparative Fit Index (CFI) = $.92$ to $.96$
• Tucker-Lewis Index (TLI) = $.91$ to $.95$
• Root Mean Square Error of Approximation (RMSEA) = $.048$ to $.065$ (90% CI: [.041, .072])
• Standardized Root Mean Square Residual (SRMR) = $.051$ to $.062$

These empirical indices validate both the multidimensional utility of the subscales and the legitimacy of computing a single higher-order global readiness score, offering clinicians flexibility depending on whether general staging or granular symptom profiling is clinically required.

Instrument / Measurement Tool

The Anorexia Nervosa Stages of Change Questionnaire (ANSOCQ) is structured as follows:

• Instrument Name: Anorexia Nervosa Stages of Change Questionnaire (ANSOCQ / ANSOC-Q)
• Assessment Type: Standardized self-report psychometric rating scale
• Target Population: Individuals diagnosed with anorexia nervosa (restricting or binge-eating/purging subtype), severe restrictive eating disorders, or atypical anorexia nervosa; validated for adults and adolescents (aged 12 years and above).
• Administration Time: Approximately 15 to 25 minutes
• Total Item Count: 20 clinical symptom items (widely presented as 19 or 20 core symptom domains covering somatic, dietary, behavioral, and characterological features).
• Response Architecture: Each item consists of a contextual symptom prompt followed by five categorical statements (labeled a, b, c, d, and e) corresponding strictly to the five Transtheoretical Model stages:
• Option (a) = Precontemplation (Assigned a numerical score of 1)
• Option (b) = Contemplation (Assigned a numerical score of 2)
• Option (c) = Preparation (Assigned a numerical score of 3)
• Option (d) = Action (Assigned a numerical score of 4)
• Option (e) = Maintenance (Assigned a numerical score of 5)
• Individual Item Customization: Certain somatic items (Items 2, 4, and 5) instruct the respondent to insert their personal minimum normal weight in kilograms (_____ kg), tailoring the psychometric assessment directly to the individual’s specific physiological reality. Item 17/18 allows respondents to specify their distinct compensatory weight control methods (e.g., restricting, purging, excessive exercise).
• Scoring Procedures:
  • Global Mean Readiness Score: The primary summary metric is obtained by summing the scores of all completed items (each scored 1 to 5) and dividing by the total number of items completed. The resulting mean score ranges continuously from 1.00 to 5.00:
  • $1.00 – 1.49$: Predominantly Precontemplative
  • $1.50 – 2.49$: Predominantly Contemplative
  • $2.50 – 3.49$: Predominantly Preparation
  • $3.50 – 4.49$: Predominantly Action
  • $4.50 – 5.00$: Predominantly Maintenance
  • Subscale Mean Scores: Calculated by averaging the scores within each specific factor (Weight and Shape Restoration, Dietary Normalization, Compensatory/Psychological Features).
  • Categorical Stage Classification: Alternatively, patients can be categorized into a predominant clinical stage based on the modal response across all items, or profiled visually across each symptom domain to construct a clinical “readiness map.”

Permissions & Fee and Test Year

• Year of Initial Publication: 2000 (Development and psychometric validation study published in the International Journal of Eating Disorders).
• Authorship and Copyright: Authored by Elizabeth Rieger, Stephen Touyz, Dirk Schotte, Pierre Beumont, Janice Russell, Simon Clarke, Michael Kohn, and Rosalyn Griffiths. Academic copyright is held by the original authors and the publisher, John Wiley & Sons, Inc.
• Accessibility and Licensing: The ANSOCQ is made widely available for academic, clinical, and non-commercial research purposes without charging royalty fees. Clinicians, researchers, and public healthcare institutions (such as National Health Service [NHS] trusts and university hospitals) may reproduce and administer the scale provided that full bibliographic attribution is maintained and items remain unedited. Commercial deployment, inclusion in proprietary software systems, or redistribution within profit-generating digital platforms requires formal written permission from the copyright holders.

References

Below are primary peer-reviewed academic references detailing the development, psychometric validation, and clinical application of the ANSOCQ:

• Rieger, E., Touyz, S., Schotte, D., Beumont, P., Russell, J., Clarke, S., Kohn, M., & Griffiths, R. (2000). Development of an instrument to assess readiness to recover in anorexia nervosa. International Journal of Eating Disorders, 28(4), 387–396. https://doi.org/10.1002/eat.10059
• Prochaska, J. O., & DiClemente, C. C. (1983). Stages and processes of self-change of smoking: Toward an integrative model of change. Journal of Consulting and Clinical Psychology, 51(3), 390–395. https://doi.org/10.1037/0022-006X.51.3.390
• Prochaska, J. O., Velicer, W. F., Rossi, J. S., Goldstein, M. G., Marcus, B. H., Rakowski, W., Fiore, C., Harlow, L. L., Redding, C. A., Rosenbloom, D., & Rossi, S. R. (1994). Stages of change and decisional balance for 12 problem behaviors. Health Psychology, 13(1), 39–46. https://doi.org/10.1037/0278-6133.13.1.39
• Swinbourne, J. M. (2008). Anxiety disorders in eating disorders: Occurrence, course, and treatment implications (Doctoral dissertation). Department of Psychology, Faculty of Science, The University of Sydney. http://ses.library.usyd.edu.au/bitstream/2123/4026/1/j-swinbourne-thesis.pdf
• Treasure, J., & Ward, A. (1997). A practical guide to the use of motivational interviewing in anorexia nervosa. European Eating Disorders Review, 5(2), 102–114. https://doi.org/10.1016/S0272-7358(98)00012-9

13. Items of the Scale (Questionnaire)