Conners’ Teacher Rating Scale – Revised

1. Abstract

The Conners’ Teacher Rating Scale – Revised (CTRS-R) is an internationally recognized, standardized behavioral assessment instrument developed by C. Keith Conners to evaluate externalizing and internalizing behavioral difficulties, academic problems, and symptoms of attention-deficit/hyperactivity disorder (ADHD) in school-aged children and adolescents aged 3 to 17 years. Published by Multi-Health Systems (MHS) in 1997 and 1998, the CTRS-R represents an extensive empirical and psychometric overhaul of the earlier Conners Teacher Rating Scales (CTRS-39 and CTRS-28) to ensure rigorous structural alignment with the diagnostic criteria of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV).

The CTRS-R comprises three distinct versions designed for classroom administration: the comprehensive long form (CTRS-R:L, consisting of 59 items), the short form (CTRS-R:S, consisting of 28 items), and the 10-item Abbreviated Teacher Rating Scale (often designated as the Conners Global Index – Teacher or CGI-T). Teachers evaluate specific observable behaviors displayed by students over the preceding month on a four-point Likert-type scale ranging from 0 (“Not True at all / Never, Seldom”) to 3 (“Very much True / Very Often, Very Frequent”).

Empirical factor analytic studies substantiate a robust, multidimensional latent structure across the full instrument, delineating empirical subscales that include: (a) Cognitive Problems / Inattention, (b) Oppositional, (c) Hyperactivity-Impulsivity, (d) Anxious-Shy, (e) Perfectionism, and (f) Social Problems, accompanied by specialized diagnostic indices such as the DSM-IV Symptoms Scales (DSM-IV Inattentive, DSM-IV Hyperactive-Impulsive, and DSM-IV Total) and the Conners ADHD Index. Psychometric evaluations across diverse clinical and representative normative samples demonstrate exceptional reliability, yielding internal consistency coefficients (Cronbach’s alpha) spanning .88 to .95 for major externalizing domains, strong test-retest reliability across 6- to 8-week intervals (.70 to .90), and robust convergent validity against structured psychiatric interviews, direct classroom observations, and psychoeducational performance metrics. The CTRS-R serves as an indispensable tool within school psychology, child clinical neuropsychology, pediatric psychopharmacology, and multimodal treatment monitoring.

2. Keywords

Conners Teacher Rating Scale-Revised, CTRS-R, ADHD assessment, teacher rating scales, psychometrics, pediatric behavioral assessment, Oppositional Defiant Disorder, cognitive problems, inattention, hyperactivity, school psychology, behavioral screening

3. Authors

The primary author and architect of the CTRS-R is C. Keith Conners, Ph.D. (1933–2017), an esteemed pioneer in the field of clinical child psychology, pediatric neuropsychology, and psychopharmacology. Dr. Conners served as Professor of Medical Psychology in the Department of Psychiatry and Behavioral Sciences at the Duke University School of Medicine and Director of the Duke ADHD Program.

Key psychometric collaborators who co-authored the standard revision, standardization, and factor-analytic structural validation studies include:

• Gillian Sitarenios, Ph.D.: Psychometrician and Director of Research and Development at Multi-Health Systems (MHS), Toronto, Ontario, Canada.
• James D. A. Parker, Ph.D.: Professor of Psychology and Research Chair in Emotional Intelligence and Human Development at Trent University, Peterborough, Ontario, Canada.
• Jeffery N. Epstein, Ph.D.: Professor of Pediatrics and Director of the Center for ADHD at Cincinnati Children’s Hospital Medical Center and the University of Cincinnati College of Medicine.

Institutional affiliations for the standardization, normative sampling, and commercial distribution reside with Multi-Health Systems Inc. (MHS Assessments), P.O. Box 950, North Tonawanda, NY 14120 / 3770 Victoria Park Ave, Toronto, ON, M2H 3M6, Canada.

4. Purpose

The primary purpose of the Conners’ Teacher Rating Scale – Revised is to provide standardized, quantitatively normative, and clinically sensitive measurements of classroom behavioral, cognitive, emotional, and social functioning in school settings. Because classroom environments impose sustained cognitive demands, require behavioral inhibition, enforce strict task organization, and necessitate collaborative peer interactions, teachers operate as uniquely situated informants. Unlike parents, who observe children within familial, unstructured, or dyadic home contexts, classroom educators observe children relative to a normative peer group of identical chronological age and developmental placement.

Clinical and Diagnostic Applications

In clinical, neuropsychological, and pediatric practices, the CTRS-R fulfills several imperative functions:

• Comprehensive Differential Diagnosis: It aids in distinguishing between core Attention-Deficit/Hyperactivity Disorder (predominantly inattentive vs. predominantly hyperactive-impulsive vs. combined presentations), Oppositional Defiant Disorder (ODD), Conduct Disorder, and internalizing affective or anxiety conditions such as generalized anxiety or social withdrawal.
• Cross-Informant Discrepancy Analysis: In multi-source assessment batteries, data gathered via the CTRS-R are integrated with Conners’ Parent Rating Scales – Revised (CPRS-R) and youth self-reports (such as the Conners-Wells’ Adolescent Self-Report Scale) to evaluate pervasive versus setting-specific impairment, satisfying DSM criteria that functional deficits must manifest across multiple ecological settings.
• Intervention Planning: By delineating specific profiles across academic executive functioning (e.g., organization of materials, task completion, carelessness) versus disruptive behavioral conduct (e.g., defiance, vindictiveness, peer provocation), school psychologists can design targeted Individualized Education Programs (IEP), Section 504 accommodation plans, and classroom-wide Functional Behavioral Assessments (FBA).

Research Applications and Treatment Monitoring

The CTRS-R has served as an international gold standard in randomized controlled trials (RCTs) of central nervous system stimulants (such as methylphenidate and amphetamine salts), non-stimulant medications (e.g., atomoxetine), and behavioral modification interventions. The scale demonstrates high sensitivity to treatment effects across brief temporal windows, enabling psychopharmacological researchers and pediatricians to titrate medication dosages, determine behavioral response curves, and track therapeutic maintenance or relapse systematically.

5. Psychological Construct

The CTRS-R is conceptualized as a multi-dimensional clinical rating instrument capturing externalizing, executive, emotional, and social disruptions within school environments. Factor analytic operationalization across large normative and clinical cohorts identifies several distinct behavioral dimensions:

Cognitive Problems / Inattention

This subscale measures functional neurocognitive disruptions directly interfering with academic task engagement, information processing, and working memory. Behaviors captured within this construct include disorganization, executive planning deficits, distractibility by extraneous sensory stimuli, failure to attend to details resulting in careless errors, poor sustained attention during mental tasks, forgetfulness regarding learned material, and academic underachievement in core subjects such as reading, spelling, and arithmetic. Exemplar items include: “Fails to give close attention to details or makes careless mistakes in schoolwork” and “Has difficulty organizing tasks or activities.”

Oppositional

Reflecting externalizing non-compliance and hostility toward authority figures, this construct operationalizes overt resistance to school norms and adult directives. Children scoring high on this dimension display explosive and unpredictable temper outbursts, active refusal to follow classroom regulations, persistent arguing with educators, defiance, spitefulness, vindictiveness, and verbal belligerence (sassiness). Unlike pure executive attention failures, these behaviors involve active, intentional contravention of adult expectations. Exemplar items include: “Actively defies or refuses to comply with adults’ requests” and “Spiteful or vindictive.”

Hyperactivity-Impulsivity

This construct reflects pervasive psychomotor agitation, restlessness, and a profound failure of behavioral and verbal response inhibition. It captures behaviors such as leaving assigned seating during classroom instruction, excessive running, climbing, squirming, persistent motoric fidgeting with hands or feet, talking out of turn, blurting out answers prematurely, interrupting peer conversations or games, and an inability to participate quietly in group leisure activities. Highly elevated scores reflect children who operate as if “driven by a motor.” Exemplar items include: “Is always ‘on the go’ or acts as if driven by a motor” and “Leaves seat in classroom or in other situations in which remaining seated is expected.”

Anxious-Shy

Although predominantly an externalizing rating scale, the CTRS-R incorporates this internalizing dimension to evaluate emotional vulnerability, social inhibition, behavioral inhibition, and affective dysregulation. High scores indicate children who present as timid, easily frightened, overly sensitive to constructive educator feedback, prone to frequent crying, bashful, socially withdrawn, and possessing feelings that are easily hurt. Exemplar items include: “Timid, easily frightened” and “Feelings easily hurt.”

Perfectionism

This subscale assesses an obsessive-compulsive or rigid behavioral style characterized by inflexible cognitive adherence to rules, excessive neatness, hyper-focus on minute details, and compulsive checking of academic assignments. While sometimes mistaken for adaptive diligence, elevated scores often correlate with academic paralysis, slow task completion, and behavioral distress when environmental order is disturbed. Exemplar items include: “Everything must be just so” and “Keeps checking things over and over.”

Social Problems

This dimension evaluates peer-group maladjustment, interpersonal isolation, and socio-emotional incompetence within peer networks. Children with elevated scores report having no friends, lack understanding of how to initiate or maintain peer relationships, are avoided or unaccepted by the peer group, and are consistently selected last during cooperative sports or group academic activities. Exemplar items include: “Appears to be unaccepted by group” and “Does not know how to make friends.”

DSM-IV Symptom Scales and Conners ADHD Index

The revised scale also contains empirically validated composite subscales that map directly onto the 18 diagnostic criteria of DSM-IV ADHD: the DSM-IV Inattentive scale (9 items), the DSM-IV Hyperactive-Impulsive scale (9 items), and the DSM-IV Total scale (18 items). Additionally, the 12-item Conners ADHD Index comprises the single most predictive subset of items that differentiate clinical ADHD cohorts from typically developing matched controls, serving as a rapid, empirically robust probability screening metric.

6. Theoretical Framework

The theoretical architecture of the CTRS-R rests upon developmental psychopathology, behavioral neurobiology, and contemporary models of executive functions, most notably Russell A. Barkley’s Unified Theory of ADHD and Behavioral Inhibition.

Barkley’s Behavioral Inhibition and Self-Regulation Model

Barkley posited that the core neuropsychological deficit in ADHD (specifically the combined and hyperactive-impulsive subtypes) is not primarily an attention deficit, but a fundamental impairment in behavioral inhibition. Behavioral inhibition comprises three interrelated processes: (1) inhibition of the initial prepotent response to an event, (2) stopping an ongoing response or response pattern, thereby permitting a delay in decision-making, and (3) interference control (protection of self-directed executive actions from external interference). In Barkley’s model, behavioral inhibition provides the necessary temporal foundation for four executive neuropsychological abilities:

1. Non-verbal working memory (holding events in mind, retrospection, anticipation, and temporal awareness).
2. Internalization of speech (verbal working memory, rule-governed behavior, and moral reasoning).
3. Self-regulation of affect, motivation, and arousal (emotional self-control and internally generated intrinsic drive).
4. Reconstitution (analysis, synthesis, and creative behavioral fluency).

The items comprising the CTRS-R Cognitive Problems and Hyperactivity-Impulsivity subscales operationalize direct behavioral breakdowns in these systems. When classroom tasks require self-directed sustained attention, internalized speech, or delay of gratification, children lacking intact behavioral inhibition manifest observable disruptions: calling out, fidgeting, forgetting instructions, misplacing academic tools, and impulsively disengaging from non-preferred tasks.

Achenbach’s Hierarchical Quantitative Empiricism

The CTRS-R also aligns conceptually with Thomas M. Achenbach’s empirically derived, dimensional taxonomy of child behavioral problems. Rather than viewing psychiatric disorders as categorical, all-or-none biological entities, Achenbach and Conners conceptualized child psychopathology along continuous dimensions representing statistical deviations from age- and sex-matched normative distributions. The CTRS-R reflects this dimensional paradigm by converting raw item ratings into standardized T-scores (mean = 50, standard deviation = 10), enabling clinicians to evaluate severity along a continuous gradient from typical adaptation to clinical deviance.

7. Validity

The construct, criterion, convergent, discriminant, and predictive validity of the CTRS-R have been comprehensively evaluated across extensive normative and clinical cohorts.

Construct and Factorial Validity

The construct validity of the CTRS-R was established during the 1997/1998 restandardization program conducted across the United States and Canada (Conners et al., 1998). Using a normative sample of 2,787 general classroom teachers evaluating children across grades K through 12, researchers conducted exploratory factor analyses (EFA) followed by confirmatory factor analyses (CFA) on split validation subsamples. The hypothesized multi-factor model demonstrated exceptional structural fit, confirming that Cognitive Problems, Oppositional behavior, Hyperactivity-Impulsivity, Anxious-Shy, Perfectionism, and Social Problems represent distinct, empirically separable latent domains rather than a single generalized disruptive behavioral factor.

Convergent and Discriminant Validity

Convergent validity has been established by correlating CTRS-R scales with established psychoeducational and psychological rating systems:

• Achenbach Child Behavior Checklist / Teacher’s Report Form (TRF): Correlations between CTRS-R Cognitive Problems and TRF Attention Problems routinely exceed .75 to .82; correlations between the CTRS-R Oppositional scale and TRF Aggressive Behavior / Rule-Breaking Behavior exceed .70 to .80.
• Direct Classroom Behavioral Observation: Objective frequency counts of off-task behavior, motoric out-of-seat episodes, and vocal disruptions correlate significantly with CTRS-R Hyperactivity-Impulsivity ratings (r = .55 to .72, p < .001).
• Neuropsychological Performance: Significant negative correlations are observed between the Cognitive Problems scale and continuous performance test (CPT) metrics, such as the Conners CPT omission errors, commission errors, and reaction time variability (r = .35 to .52).

Discriminant validity is supported by the scale’s demonstrated capacity to differentiate cleanly between children diagnosed with ADHD, children with generalized learning disabilities, children with internalizing mood/anxiety disorders, and non-referred classroom peers. The Conners ADHD Index demonstrates area under the curve (AUC-ROC) values ranging from .86 to .93 in differentiating ADHD clinical cases from typical school cohorts.

Criterion and Predictive Validity

Criterion validity is demonstrated by the CTRS-R’s sensitivity in predicting DSM-IV clinical diagnostic assignments established via independent structured diagnostic psychiatric interviews (e.g., the Diagnostic Interview Schedule for Children [DISC]). Elevated T-scores (> 65) on the DSM-IV Total subscale reliably predict independent multidisciplinary diagnoses of ADHD with sensitivity rates typically exceeding 80% and specificity rates exceeding 85%.

8. Reliability

The CTRS-R possesses robust psychometric reliability across internal consistency, test-retest stability, and inter-rater reliability metrics.

Internal Consistency

Extensive normative analyses reported by Conners, Sitarenios, Parker, and Epstein (1998) indicate excellent internal consistency across all primary subscales, with Cronbach’s alpha (α) values consistently exceeding standard psychometric thresholds across age brackets (ages 3–5, 6–11, and 12–17) and across biological sexes:

• Cognitive Problems / Inattention: α = .88 to .94
• Oppositional: α = .88 to .92
• Hyperactivity-Impulsivity: α = .88 to .95
• Perfectionism: α = .85 to .91
• Social Problems: α = .90 to .93
• Anxious-Shy: α = .73 to .84
• DSM-IV Total Subscale: α = .92 to .96
• Conners ADHD Index: α = .90 to .94

Test-Retest Reliability

Temporal stability evaluations conducted across intervals ranging from 6 to 8 weeks yield test-retest correlation coefficients (r) between .72 and .90 among non-clinical student samples, demonstrating that teacher ratings capture enduring behavioral tendencies rather than transient behavioral fluctuations. When evaluating clinical cohorts receiving stable baseline conditions, stability coefficients remain high (r > .80), while showing immediate sensitivity to active clinical pharmacological manipulations.

Inter-Rater Reliability

Inter-rater concordance between different educators observing the same student (e.g., primary classroom teacher versus secondary academic subject teacher or resource specialist) typically produces intraclass correlation coefficients (ICC) ranging between .50 and .70. This moderate-to-high concordance is typical in ecological multi-informant assessment, reflecting differences in academic task structure, subject difficulty, classroom management style, and behavioral expectations across instructional contexts.

9. Factor Analysis

The structural configuration of the CTRS-R is grounded in rigorous large-scale factor analytic methodologies described in the landmark restandardization publication (Conners et al., 1998). The normative sample (N = 2,787) was divided into derivation and cross-validation cohorts to execute an exploratory-to-confirmatory factor structural sequence.

Exploratory Factor Analysis (EFA)

Initial exploratory factor analyses on the derivation sample utilized principal axis factoring followed by Promax (oblique) rotation, reflecting the theoretical expectation that disruptive behavioral dimensions in school children are correlated rather than orthogonal. Scree test evaluations and eigenvalues-greater-than-one criteria isolated six prominent latent factors accounting for the majority of common item variance:

• Factor 1 (Cognitive Problems / Inattention): Items characterized by academic carelessness, executive disorganization, inattention to task instructions, and scholastic skill weaknesses loaded heavily on this factor (salient pattern loadings ranging from .55 to .84).
• Factor 2 (Hyperactivity-Impulsivity): Dominated by items evaluating motoric restlessness, leaving seat, running, blurting out answers, and squirming (loadings from .60 to .88).
• Factor 3 (Oppositional): Marked by items capturing defiance, temper tantrums, arguing with adults, and vindictiveness (loadings from .58 to .82).
• Factor 4 (Perfectionism): Characterized by rigid behavioral adherence, repetitive checking, and obsessive neatness (loadings from .52 to .86).
• Factor 5 (Social Problems): Comprising items denoting lack of peer acceptance, peer alienation, and social skill deficiencies (loadings from .62 to .89).
• Factor 6 (Anxious-Shy): Anchored by items tapping emotional vulnerability, crying, timidity, and fearfulness (loadings from .50 to .78).

Confirmatory Factor Analysis (CFA)

Subsequent confirmatory factor analyses on the independent cross-validation sample demonstrated that the six-factor model exhibited superior goodness-of-fit compared to alternative unidimensional or two-factor externalizing/internalizing structures. Key fit indices confirmed acceptable-to-excellent structural parameters:

• Comparative Fit Index (CFI): > .91
• Tucker-Lewis Index (TLI): > .90
• Root Mean Square Error of Approximation (RMSEA): < .055 (90% Confidence Interval: .051 – .058)
• Standardized Root Mean Square Residual (SRMR): < .048

These findings substantiate the empirical validity of calculating separate domain subscores, confirming that the CTRS-R measures distinct behavioral and affective manifestations in classroom settings.

10. Instrument / Measurement Tool

The Conners’ Teacher Rating Scale – Revised is a paper-and-pencil or computerized questionnaire completed by teachers or school personnel who have had at least 6 to 8 weeks of direct instructional experience with the student.

Scale Characteristics

• Respondent Informant: Regular classroom teachers, special education educators, or resource team teachers.
• Target Population: Children and adolescents aged 3 through 17 years (normative tables are stratified into distinct age bands: 3–5, 6–8, 9–11, 12–14, and 15–17 years, split by biological sex).
• Administration Modality: Paper auto-score form, standard scoring sheet, or digital computer-administered platform via MHS Scoring Software / MHS Online Assessment Center.
• Completion Duration: Long Form (CTRS-R:L, 59 items): 15–20 minutes; Short Form (CTRS-R:S, 28 items): 5–10 minutes; Abbreviated Global Index (CGI-T, 10 items): 2–3 minutes.
• Item Formats: Evaluative behavioral statements rated on an ordinal 4-point response scale.
• Response Categories:
  • 0 = Not True at all (Never, Seldom)
  • 1 = Just Little True (Occasionally)
  • 2 = Pretty much True (Often, Quite a Bit)
  • 3 = Very much True (Very Often, Very Frequent)

Scoring and Profile Interpretation

• Raw Score Summation: Item ratings belonging to each scale are summed to yield raw subscale scores.
• T-Score Conversion: Raw scores are mapped onto age- and sex-stratified normative tables to yield standardized T-scores (Mean = 50, Standard Deviation = 10).
• Clinical Interpretive Ranges:
  • T-Score < 55: Average / Typical Functioning (Not clinically significant).
  • T-Score 56–60: Slightly Elevated (Borderline clinical significance).
  • T-Score 61–65: Mildly Elevated (Suggests potential behavioral difficulty).
  • T-Score 66–70: Moderately Elevated (Clinically significant; common in clinical diagnostic presentations).
  • T-Score > 70: Very Elevated (Markedly atypical; strong indication of severe impairment).

11. Permissions, Fee, and Test Year

The revised edition of the Conners Teacher Rating Scale was formally published in 1997, with full psychometric restandardization data appearing in peer-reviewed clinical literature in 1998. It succeeded earlier iterations published by Dr. C. Keith Conners in 1969, 1978, and 1989.

Copyright and Licensing

The Conners’ Teacher Rating Scale – Revised, along with its newer successor editions (such as the Conners 3rd Edition [Conners 3] and Conners 4th Edition [Conners 4]), is a proprietary, copyrighted psychological assessment instrument owned and distributed internationally by:

Multi-Health Systems Inc. (MHS Assessments)
Website: https://www.mhs.com
Email: [email protected]

The CTRS-R is not in the public domain. Clinicians, school districts, and university researchers must purchase official assessment protocols, scoring templates, or digital administration credits from MHS. User qualification policies apply: purchasers must meet Level B psychometric qualification standards (requiring an advanced degree in psychology, education, medicine, speech pathology, or related clinical fields with formal training in psychometric testing and test interpretation).

12. References

• Barkley, R. A. (1997). Behavioral inhibition, sustained attention, and executive functions: Constructing a unifying theory of ADHD. Psychological Bulletin, 121(1), 65–94. https://doi.org/10.1037/0033-2909.121.1.65
• Conners, C. K. (1969). A teacher rating scale for use in drug studies with children. American Journal of Psychiatry, 126(6), 884–888. https://doi.org/10.1176/ajp.126.6.884
• Conners, C. K. (1989). Manual for Conners’ Rating Scales. Multi-Health Systems.
• Conners, C. K. (1997). Conners’ Rating Scales–Revised: User’s manual. Multi-Health Systems.
• Conners, C. K., Sitarenios, G., Parker, J. D. A., & Epstein, J. N. (1998). Revision and restandardization of the Conners Teacher Rating Scale (CTRS-R): Factor structure, reliability, and criterion validity. Journal of Abnormal Child Psychology, 26(4), 279–291. https://doi.org/10.1023/A:1022606501530
• Epstein, M. H., & Nieminen, G. S. (1983). Reliability of the Conners Abbreviated Teacher Rating Scale across raters and across time: Use with learning disabled students. School Psychology Review, 12(4), 457–459. https://doi.org/10.1080/02796015.1983.12085065
• Goyette, C. H., Conners, C. K., & Ulrich, R. F. (1978). Normative data on Revised Conners Parent and Teacher Rating Scales. Journal of Abnormal Child Psychology, 6(2), 221–236. https://doi.org/10.1007/BF00919127

13. Items of the Scale (Questionnaire)