Anger assessment with the STAXI-CA

Abstract

The State-Trait Anger Expression Inventory-Child and Adolescent (STAXI-CA) is a standardized psychometric self-report instrument designed to quantify the experience, expression, and control of anger in youth aged 7 to 17 years. Originating from the theoretical framework established by Charles D. Spielberger and adapted specifically for pediatric populations by Victoria del Barrio, Anton Aluja, and Charles Spielberger (2004), the STAXI-CA addresses the critical developmental need for reliable emotional assessment in children and adolescents. The instrument operationalizes anger within the Anger-Hostility-Aggression (AHA) framework, differentiating between anger as an acute, transitory emotional condition (State Anger) and anger as a stable, cross-situational personality disposition (Trait Anger). Furthermore, the scale evaluates specific directional coping modes: externalized anger expression (Anger-Out), internalized anger suppression (Anger-In), and cognitive-behavioral emotional regulation strategies (Anger Control).

Comprising 46 items rated on an age-appropriate Likert scale, the STAXI-CA demonstrates robust psychometric properties across both clinical and community cohorts. Psychometric evaluations demonstrate strong internal consistency (with Cronbach’s alpha coefficients typically ranging between .71 and .88 across subscales) and sound test-retest reliability for trait and expression dimensions. Exploratory and confirmatory factor analyses replicate the structural dimensions identified in adult populations while accommodating the cognitive and socioemotional developmental stages of childhood and adolescence. By facilitating early identification of maladaptive anger patterns, the STAXI-CA serves as an indispensable tool in child clinical psychology, juvenile justice assessments, educational intervention planning, and pediatric psychosomatic medicine.

Keywords

State-Trait Anger Expression Inventory, STAXI-CA, pediatric anger assessment, child psychometrics, adolescent aggression, State Anger, Trait Anger, Anger Expression-Out, Anger Expression-In, Anger Control, Charles Spielberger, emotional regulation, developmental psychopathology

Authors

The STAXI-CA was developed through an international collaborative research effort led by scholars specializing in child personality assessment and developmental psychometrics:

• Victoria del Barrio, Ph.D.: Department of Personality, Assessment, and Psychological Treatment, Faculty of Psychology, National University of Distance Education (Universidad Nacional de Educación a Distancia – UNED), Madrid, Spain. Dr. del Barrio is a prominent clinical psychologist whose research focuses on emotional development, childhood depression, and child aggression assessment.
• Anton Aluja, Ph.D.: Department of Psychology, Universitat de Lleida and Institut de Recerca Biomèdica de Lleida (IRBLleida), Catalunya, Spain. Dr. Aluja is an expert in individual differences, personality biological foundations, and psychometric validation of assessment batteries.
• Charles D. Spielberger, Ph.D., ABPP (1927–2013): Department of Psychology, Center for Research in Behavioral Medicine and Health Psychology, University of South Florida, Tampa, Florida, USA. Dr. Spielberger was an internationally renowned psychometrician who pioneered the distinction between state and trait constructs in clinical psychology and developed the State-Trait Anxiety Inventory (STAI) and State-Trait Anger Expression Inventory (STAXI).

Purpose

Anger represents a primary affective state characterized by subjective feelings that vary in intensity from mild irritation or annoyance to intense fury and rage. While anger is an evolutionarily conserved, adaptive emotional response designed to signal boundary violations or facilitate goal-directed behavior, chronic dysregulation of anger during childhood and adolescence is a central transdiagnostic risk factor. Heightened anger reactivity and maladaptive expression are closely linked to conduct disorder, oppositional defiant disorder (ODD), peer victimization, school dropout, juvenile delinquency, and early-onset depressive disorders. Conversely, chronic suppression of anger without adequate behavioral or cognitive control has been implicated in internalizing disorders and pediatric autonomic dysregulation.

The primary purpose of the STAXI-CA is to provide a developmentally calibrated, psychometrically rigorous measurement system capable of delineating the multifaceted nature of pediatric anger. Prior to the construction of this scale, clinicians and researchers frequently relied on adult inventories that contained linguistic idioms inaccessible to young children or utilized broad-band behavior checklists completed by parents or teachers (e.g., the Child Behavior Checklist). While collateral reports provide critical behavioral observations, they systematically fail to capture the subjective, internal phenomenological experience of anger, particularly internalizing suppression or covert emotional distress.

The STAXI-CA fills this methodological void by serving multiple diagnostic, clinical, and experimental functions:

• Differential Diagnosis: Distinguishing between situational emotional crises (elevated State Anger) and enduring behavioral patterns (elevated Trait Anger or low Anger Control), thereby guiding targeted diagnostic classifications in pediatric mental health clinics.
• Intervention Planning: Identifying whether a child’s behavioral difficulties stem from hyper-reactivity (Angry Reaction), pervasive temperament (Angry Temperament), explosive behavioral outbursts (Anger-Out), social withdrawal and somatic internalization (Anger-In), or deficits in emotional modulation skills (Anger Control).
• Treatment Outcome Monitoring: Serving as a pre- and post-test evaluative tool for cognitive-behavioral therapy (CBT), social skills training, and socio-emotional learning (SEL) anger-coping curricula in clinical and school settings.
• Developmental and Epidemiological Research: Enabling longitudinal investigations into the trajectory of anger regulation across childhood, puberty, and late adolescence, including sex differences in emotional socialization.

Psychological Construct

The STAXI-CA operationalizes anger as a multi-component psychological construct encompassing affective, cognitive, physiological, and behavioral dimensions. Rather than viewing anger as a monolithic emotion, the inventory delineates several discrete yet interrelated constructs:

1. State Anger (S-Ang)

State Anger is defined as a transitory emotional condition or feeling state consisting of subjective feelings of tension, annoyance, irritation, fury, or rage, accompanied by activation of the autonomic nervous system. In the STAXI-CA, State Anger captures the respondent’s emotional intensity at the immediate moment of evaluation. It encompasses two core facets:

• Feeling Anger: The subjective, internal emotional sensation of being irritated, angry, or furious (e.g., “I am furious”, “I feel irritated”).
• Desire to Express Anger: The physiological and behavioral action impulses driving the child to release tension through verbal or physical destruction (e.g., “I feel like screaming”, “I feel like breaking things”, “I feel like hitting someone”).

2. Trait Anger (T-Ang)

Trait Anger reflects enduring individual differences in the frequency, intensity, and duration with which State Anger is experienced over extended periods. Children with high Trait Anger perceive a broader array of situations as provocative, unfair, or frustrating. Trait Anger is differentiated into two distinct sub-constructs:

• Angry Temperament (T-Ang/T): A general, unprovoked disposition to experience and express anger quickly, reflecting high emotional lability, low frustration tolerance, and an explosive disposition without specific external provocation (e.g., “I am quick tempered”, “I have a bad temper”).
• Angry Reaction (T-Ang/R): Sensitivity to specific interpersonal events, particularly perceived injustice, negative evaluation, unwarranted criticism, or frustration caused by the perceived incompetence of others (e.g., “I get angry when I’m told I’m wrong in front of the others”, “I feel infuriated when I do a good job and get a poor evaluation”).

3. Anger Expression-Out (AX-O)

Anger Expression-Out reflects the propensity to direct angry feelings outward toward other people or physical objects in the environment. This construct encompasses both overt verbal aggression (e.g., swearing, shouting, arguing, making derogatory remarks) and physical aggression or destruction (e.g., slamming doors, hitting, kicking, smashing objects). High scores indicate under-regulation of aggressive behavioral impulses.

4. Anger Expression-In (AX-I)

Anger Expression-In measures the extent to which angry feelings are held in, concealed, suppressed, or directed inwardly toward the self. Children high in this construct experience intense anger but deliberately avoid externalizing behaviors, opting instead for emotional withdrawal, sulking, crying, or somatic internalization (e.g., “I hide my anger”, “I withdraw from other people”, “I hold my anger in”).

5. Anger Control (AC)

Anger Control assesses the frequency with which a child actively deploys cognitive, physiological, and behavioral self-regulation strategies to monitor, reduce, or extinguish anger before it results in aggressive behavior. This includes intentional cognitive reappraisal, physiological de-escalation (taking deep breaths, seeking relaxation), behavioral inhibition, and proactive self-calming (e.g., “I take a deep breath and relax”, “I try to calm myself”, “I control my anger feelings”). In modern formulations, this reflects regulatory emotional self-efficacy.

Theoretical Framework

The theoretical architecture of the STAXI-CA is grounded in the State-Trait Theory of Emotion initially formulated by Raymond Cattell and substantially expanded into psychometric clinical frameworks by Charles D. Spielberger (1980, 1988, 1999). Spielberger recognized that affective phenomena must be dissected along temporal and dispositional planes: transient, fluctuating physiological and subjective states must be conceptually and empirically distinguished from pervasive personality traits that predispose individuals to specific state activations.

This state-trait dichotomy operates within the broader Anger-Hostility-Aggression (AHA) Model (Spielberger et al., 1983; Spielberger, 1988). The AHA syndrome provides a clear conceptual taxonomy:

• Anger: The primary, acute affective response consisting of physiological arousal and subjective distress.
• Hostility: A cognitive and attitudinal construct involving stable negative evaluations, pervasive cynicism, mistrust, and an attributional style that interprets others’ ambiguous behaviors as malevolent.
• Aggression: The overt, observable behavioral action directed toward harming individuals or damaging property, which can be verbal or physical, instrumental or reactive.

In developmental psychopathology, Thomas Achenbach and colleagues established the fundamental bifurcation of psychological difficulties into externalizing and internalizing domains. Victoria del Barrio (2002) integrated these developmental insights into the AHA model, demonstrating that although verbal expressions of frustration emerge around age three, it is around the age of seven that children achieve the requisite cognitive maturation (concrete operational stage), meta-emotional awareness, and linguistic competence to introspect accurately and report on their internal emotional states via self-report questionnaires.

Before age seven, children regulate emotion primarily through external behavioral interactions and scaffolding provided by caregivers. After age seven, internal cognitive mechanisms—such as deliberate suppression (Anger-In) or cognitive reframing (Anger Control)—become prominent components of their emotional repertoire. The STAXI-CA was intentionally engineered to map directly onto this emerging developmental capacity for emotional self-monitoring.

Validity

The validity of the STAXI-CA has been substantiated across diverse clinical and empirical paradigms, confirming that the scale accurately captures the intended theoretical dimensions of youth anger.

Construct and Structural Validity

Construct validity is evidenced by the distinct empirical separation between state, trait, and expression/control dimensions. In the seminal psychometric validation study conducted by del Barrio, Aluja, and Spielberger (2004) with a representative sample of 1,189 Spanish children and adolescents (aged 7 to 17), structural equations and correlation matrices confirmed that State Anger behaves as an acute condition, correlating moderately with Trait Anger during resting baseline conditions, but demonstrating heightened reactivity under laboratory-induced frustration or real-world situational conflict.

Convergent and Discriminant Validity

Convergent validity has been evaluated by contrasting the STAXI-CA with established parent-, teacher-, and youth-report behavior scales:

• Externalizing Dimensions: The Anger Expression-Out (AX-O) and Trait Anger (T-Ang) subscales demonstrate robust, statistically significant positive correlations (ranging from .45 to .68, p < .001) with the Aggressive Behavior and Rule-Breaking Behavior scales of the Youth Self-Report (YSR) and Child Behavior Checklist (CBCL), as well as the Buss-Perry Aggression Questionnaire.
• Internalizing Dimensions: The Anger Expression-In (AX-I) subscale correlates significantly with depressive symptomatology assessed by the Children’s Depression Inventory (CDI) and somatic complaints subscales of the CBCL (coefficients typically between .35 and .52, p < .001), corroborating the theoretical premise that internalized anger plays a significant role in internalizing pathology.
• Discriminant Validity: The Anger Control (AC) subscale displays moderate-to-strong inverse correlations with overt behavioral misconduct and disciplinary sanctions, while showing negligible or non-significant correlations with unrelated cognitive ability measures, demonstrating that the inventory does not simply reflect general social compliance or intelligence.

Criterion and Clinical Validity

The scale effectively discriminates between clinical and non-clinical youth cohorts. Adolescents diagnosed with Oppositional Defiant Disorder or Conduct Disorder score significantly higher on Trait Anger, Angry Temperament, and Anger Expression-Out, and substantially lower on Anger Control, compared to age- and sex-matched neurotypical peers. Furthermore, in juvenile justice settings, high Trait Anger and AX-O scores significantly predict institutional disciplinary infractions and violent recidivism.

Reliability

Empirical evaluations of the STAXI-CA confirm sound psychometric reliability across internal consistency and temporal stability metrics:

Internal Consistency

In standard psychometric investigations (del Barrio et al., 2004), the internal consistency of the STAXI-CA subscales was systematically examined across distinct developmental cohorts (children aged 7–11 vs. adolescents aged 12–17) and across gender groups. The subscales consistently exhibit acceptable-to-high Cronbach’s alpha coefficients:

• State Anger (S-Ang): α = .82 to .88 (reflecting high coherence among acute anger symptoms).
• Trait Anger (T-Ang): α = .78 to .84 across age tiers.
• Angry Temperament (T-Ang/T): α = .71 to .79.
• Angry Reaction (T-Ang/R): α = .70 to .76.
• Anger Expression-Out (AX-O): α = .73 to .81.
• Anger Expression-In (AX-I): α = .68 to .75 (a slight dip in younger children due to the developmental complexity of conceptualizing covert suppression).
• Anger Control (AC): α = .81 to .87, demonstrating strong reliability for youth reporting their self-soothing and inhibitory strategies.

Test-Retest Stability

Stability coefficients evaluated across intervals ranging from two to six weeks align closely with Spielberger’s theoretical postulates:

• State Anger exhibits low-to-moderate temporal stability (r = .20 to .35), which is theoretically expected for an instrument designed to capture transient, situational emotional states that vary rapidly in response to immediate ambient stimuli.
• Trait Anger and Expression Subscales demonstrate strong test-retest coefficients (r = .68 to .81), indicating that individual differences in temperamental reactivity, externalizing behavior, and internalizing suppression remain stable across time in the absence of targeted psychological intervention.

Factor Analysis

The structural validity of the STAXI-CA was rigorously evaluated through both Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) during its developmental standardization:

Exploratory Factor Structure

In the original factor analyses reported by del Barrio et al. (2004), principal axis factoring with oblimin and varimax rotations was conducted separately for the three conceptual blocks of the test: State items, Trait items, and Expression/Control items:

• State Anger Block: Factor analyses clearly yielded two correlated primary factors: Feeling Anger (items tapping pure emotional arousal, such as feeling furious, irritated, or annoyed) and Action Impulses (items reflecting behavioral urges to scream, hit, kick, or break things). Item loadings on their respective primary factors exceeded .50, with minimal cross-loadings.
• Trait Anger Block: Factor solutions replicated the classic two-factor model established in adult STAXI inventories: Angry Temperament (spontaneous, hot-headed reactivity without obvious cause) and Angry Reaction (anger provoked by perceived mistreatment, unfair grading, or public embarrassment).
• Expression and Control Block: Analysis revealed a three-factor solution representing Anger Control (items measuring active relaxation, calming strategies, and self-restraint), Anger Expression-Out (overt aggressive actions, slamming doors, verbal arguments), and Anger Expression-In (concealing anger, crying, social withdrawal).

Confirmatory Factor Analysis (CFA) Fit Indices

Subsequent structural modeling in adolescent and pediatric samples confirmed that the multi-factor hierarchical model provides an acceptable fit to the empirical data. Model fit indices routinely meet established psychometric benchmarks:

• Root Mean Square Error of Approximation (RMSEA): Values typically range from .045 to .058, indicating close approximate fit.
• Comparative Fit Index (CFI): Values consistently exceed .90 to .94 across age-stratified cohorts.
• Tucker-Lewis Index (TLI): Values exceed .90, demonstrating robust replicability of the latent factors across diverse sociocultural contexts.

Instrument / Measurement Tool

• Instrument Name: State-Trait Anger Expression Inventory-Child and Adolescent (STAXI-CA).
• Authors: Victoria del Barrio, Anton Aluja, and Charles D. Spielberger (2004).
• Target Population: Children and adolescents aged 7 to 17 years (readable at or above a 2nd-grade reading level).
• Administration Format: Self-report paper-and-pencil or computer-administered questionnaire. Can be administered individually or in group settings. For children aged 7–8, clinicians may read items aloud if reading difficulties are present.
• Completion Time: Approximately 10 to 15 minutes.
• Item Count: 46 items categorized into three operational sections:
  • Part 1: State Anger (Items 1–12)
  • Part 2: Trait Anger (Items 13–21)
  • Part 3: Anger Expression and Control (Items 22–46)
• Response Scale:
  • In child adaptations, items are scored on an age-appropriate 3-point Likert scale:
    • 1 = Hardly ever / Almost never / Nothing (Casi nunca / Nada)
    • 2 = Sometimes / A little (A veces / Algo)
    • 3 = Often / Almost always (A menudo / Casi siempre)
  • In certain adolescent research protocols, a standard 4-point Likert format is used (1 = Almost Never / Not at all; 2 = Sometimes / Somewhat; 3 = Often / Moderately so; 4 = Almost Always / Very much so).
• Scoring and Subscales:
  • State Anger (S-Ang): Sum of items 1 to 12.
  • Trait Anger (T-Ang): Sum of items 13 to 21 (subdivided into Angry Temperament and Angry Reaction).
  • Anger Expression-Out (AX-O): Calculated by summing externalizing items (e.g., items 22, 26, 27, 29, 34, 36).
  • Anger Expression-In (AX-I): Calculated by summing internalizing/suppression items (e.g., items 23, 24, 25, 28, 35).
  • Anger Control (AC): Calculated by summing emotional regulation and calming items (e.g., items 30, 31, 32, 33, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46).
  • Anger Expression Index (AX Index): A global metric reflecting overall anger proneness, calculated using the standard formulation: AX Index = AX-O + AX-I – AC + Correction Constant.

Permissions & Fee and Test Year

The STAXI-CA was formally published in 2004 following extensive psychometric standardization across Spanish and international youth populations. The conceptual framework, design, and original psychometric validation are copyrighted by the authors (Victoria del Barrio, Anton Aluja, and Charles D. Spielberger) and published under academic dissemination in Personality and Individual Differences (Elsevier). Commercial Spanish test kits, comprehensive normative scoring tables, and clinical manuals are distributed by TEA Ediciones (Madrid, Spain) and authorized psychometric distributors.

For independent academic, non-commercial research and educational investigations, access to the items is governed by fair-use scientific research guidelines or formal permission requests through corresponding author channels. Clinical diagnostic usage, commercial assessment batteries, and standardized profile forms require purchasing official licensed protocols from commercial test publishers to ensure normative compliance.

References

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Items of the Scale