Measures and constructs
Primary instrument
The Adult ADHD Self-Report Scale, version 1.1 (ASRS-v1.1) — Kessler RC, Adler L, Ames M, et al. (2005). Psychological Medicine, 35(2), 245–256. doi:10.1017/s0033291704002892. The 18-item instrument was developed by Harvard's Department of Health Care Policy in collaboration with the World Health Organization for the World Mental Health Survey Initiative. It is in the public domain and is the canonical brief adult ADHD screener globally.
Construct definition
The instrument operationalizes the DSM-IV/DSM-5 ADHD symptom criteria into 18 self-report items, each rated on a 5-point frequency scale (Never / Rarely / Sometimes / Often / Very Often) referenced to the past 6 months. The 18 items map directly to the 18 DSM-5 ADHD symptoms — 9 inattention symptoms (criterion A1) and 9 hyperactivity-impulsivity symptoms (criterion A2). The instrument does not address the additional DSM-5 criteria for diagnosis (childhood-onset, presence in multiple settings, functional impairment, exclusion of better-explanation by another disorder) — those require clinical evaluation.
Why this instrument over alternatives
| Instrument | Items | Licensing | Used here? |
|---|---|---|---|
| ASRS-v1.1 (Kessler 2005) | 18 | Public domain (WHO) | Yes — primary |
| Conners' Adult ADHD Rating Scale | 66 | Proprietary | No (paywalled, too long) |
| Brown ADD Scales | 40 | Proprietary | No (paywalled, narrow construct) |
| Wender Utah Rating Scale | 25 or 61 | Free | No (childhood-retrospective only) |
| ADHD Self-Report Scale (ADHD-SR) | 18 | Free | No (less-cited variant) |
The ASRS-v1.1 was selected for: (a) the cleanest licensing — WHO public domain; (b) brevity at 18 items; (c) direct DSM mapping; (d) the embedded 6-item screener (items 1–6) for binary classification alongside the dimensional profile; (e) global epidemiology — the ASRS underlies the National Comorbidity Survey Replication adult ADHD prevalence estimates (Kessler 2006).
Instrument structure
The 18 items map to the DSM-5 ADHD symptom criteria. Each item is rated 0–4 (Never / Rarely / Sometimes / Often / Very Often) over the past 6 months. Items 1–6 (marked ★ below) form the optimized 6-item ASRS Screener — the brief detection subset Kessler 2005 identified as the strongest screening combination.
| # | Item | Subscale | DSM-5 |
|---|---|---|---|
| 1 | How often do you have trouble wrapping up the final details of a project, once the challenging parts have been done? | Inattention | A1a |
| 2 | How often do you have difficulty getting things in order when you have to do a task that requires organization? | Inattention | A1d |
| 3 | How often do you have problems remembering appointments or obligations? | Inattention | A1g |
| 4 | When you have a task that requires a lot of thought, how often do you avoid or delay getting started? | Inattention | A1f |
| 5 | How often do you fidget or squirm with your hands or feet when you have to sit down for a long time? | Hyperactivity | A2a |
| 6 | How often do you feel overly active and compelled to do things, like you were driven by a motor? | Hyperactivity | A2e |
| 7 | How often do you make careless mistakes when you have to work on a boring or difficult project? | Inattention | A1a |
| 8 | How often do you have difficulty keeping your attention when you are doing boring or repetitive work? | Inattention | A1b |
| 9 | How often do you have difficulty concentrating on what people say to you, even when they are speaking to you directly? | Inattention | A1c |
| 10 | How often do you misplace or have difficulty finding things at home or at work? | Inattention | A1h |
| 11 | How often are you distracted by activity or noise around you? | Inattention | A1i |
| 12 | How often do you leave your seat in meetings or other situations in which you are expected to remain seated? | Hyperactivity | A2b |
| 13 | How often do you feel restless or fidgety? | Hyperactivity | A2c |
| 14 | How often do you have difficulty unwinding and relaxing when you have time to yourself? | Hyperactivity | A2d |
| 15 | How often do you find yourself talking too much when you are in social situations? | Hyperactivity | A2f |
| 16 | When you're in a conversation, how often do you find yourself finishing the sentences of the people you are talking to before they can finish them themselves? | Hyperactivity | A2g |
| 17 | How often do you have difficulty waiting your turn in situations where turn-taking is required? | Hyperactivity | A2h |
| 18 | How often do you interrupt others when they are busy? | Hyperactivity | A2i |
Subscale definitions
Inattention — items 1, 2, 3, 4, 7, 8, 9, 10, 11 (n=9). Maps to DSM-5 criterion A1. Range 0–36.
Hyperactivity-Impulsivity — items 5, 6, 12, 13, 14, 15, 16, 17, 18 (n=9). Maps to DSM-5 criterion A2. Range 0–36.
Total score — sum of all 18 items. Range 0–72.
6-item ASRS Screener subset — items 1, 2, 3, 4 (Inattention) and items 5, 6 (Hyperactivity). Scored separately with item-specific cutoffs (see Section III).
Scoring algorithm — full pseudocode
The complete scoring logic, exactly as implemented in the tool's JavaScript. Three computations are produced from the 18 item responses: total score, two subscale scores, and the 6-item screener positive/negative classification. The archetype is then matched from the subscale scores using a first-match-wins decision rule.
Step 1 — Compute total and subscale sums
Step 2 — Compute 6-item ASRS Screener result
The screener uses item-specific cutoffs from Kessler 2005. A response is "positive" if it meets or exceeds the item's cutoff. Four or more positive items means screener-positive overall.
Step 3 — Map total score to severity band
Step 4 — Count high-frequency items per subscale (for archetype matching)
The DSM-5 adult ADHD threshold is 5+ of 9 symptoms in either dimension. We adapt this to "5+ items at Often or Very Often" as a pragmatic surrogate for the clinical symptom-count requirement.
Step 5 — Match to archetype (first match wins)
Rule-order rationale
The decision tree tests the most-specific rules first. The Focused (low symptom burden) is tested first because it captures the largest single group (~50% of the general adult population per Kessler 2005). The Kinetic Mind is tested next because both-dimensions-high is the most clinically severe and most specific pattern. The Drifter and The Dynamo are tested next because they are the DSM-5 single-presentation specifiers. The Tired falls through last because it is defined by the absence of all prior rules — moderate symptoms without DSM-mapped dominance.
Validation strategy
Internal consistency
The ASRS-v1.1 has been replicated across multiple population samples. Cronbach's α for the full 18-item scale is consistently in the 0.84–0.93 range across published samples (Kessler 2005 development sample, Adler 2006 clinical replication, de Vries 2014 Dutch validation). Subscale α values are typically 0.78–0.88 for Inattention and 0.81–0.90 for Hyperactivity-Impulsivity.
Diagnostic accuracy of the 6-item screener
| Sample | n | Sensitivity | Specificity | Reference |
|---|---|---|---|---|
| NCS-R general population | 966 | 68.7% | 99.5% | Kessler 2005 |
| Clinical sample (diagnosed ADHD) | 154 | — | — | Kessler 2005 |
| Adult psychiatric outpatients | 60 | 87.5% | 68.6% | Adler 2006 |
| Dutch general population | 1003 | 77.0% | 92.0% | de Vries 2014 |
Performance varies substantially by sample composition. The Kessler 2005 specificity of 99.5% reflects the low base rate of ADHD in the general population (~4.4%). In high-base-rate samples (psychiatric outpatients), specificity drops as expected. Sensitivity ranges 68–88% across samples.
Test-retest reliability
Test-retest correlation has been reported in the 0.85–0.88 range over 1–4 week intervals (Adler 2006). The instrument is appropriate for one-time screening; repeated administration in short windows shows minimal practice effects.
Convergent validity
The ASRS-v1.1 correlates moderately-to-strongly with longer ADHD instruments — Conners' Adult ADHD Rating Scale (r ≈ 0.66–0.78), Brown ADD Scales (r ≈ 0.60–0.72), and the WHO-DAS-II disability metric (r ≈ 0.40–0.55). The correlations support construct validity for the adult ADHD construct without indicating redundancy.
Cross-cultural validity
The ASRS has been translated into 35+ languages. Validation studies in Dutch (de Vries 2014), German, Spanish, French, Japanese, and Chinese samples generally replicate the two-factor structure (Inattention + Hyperactivity-Impulsivity) and show acceptable internal consistency. Sex differences in mean scores are small but consistently in the direction of slightly higher male hyperactivity-impulsivity and slightly higher female inattention.
Score-band derivation
Unlike instruments such as the GAD-7 (anxiety) or PHQ-9 (depression) that have published clinical-consensus severity bands, the ASRS does not. The instrument was developed for binary screening, and the original Kessler 2005 paper provides ROC analysis but no official band cutpoints. The four LBL bands are an explicitly-disclosed author choice anchored to the Kessler 2005 normative distribution. They are presented as a pedagogical aid for "where am I relative to other adults," not as diagnostic thresholds.
The bands
| Band | Score | Anchored to |
|---|---|---|
| Minimal | 0–17 | Below US adult population median (16.7) per Kessler 2005 NCS-R subsample, n=966 |
| Mild | 18–35 | Median to ~1 SD above mean (mean 16.7, SD 9.0); symptoms present but subthreshold |
| Moderate | 36–53 | Approximately diagnosed-ADHD mean minus 1 SD (clinical sample mean 36.4, SD 13.7); consistent with screen-positive adults |
| Severe | 54–72 | Approximately diagnosed-ADHD mean plus 1 SD; high symptom burden even by clinical standards |
Statistical justification for cutpoints
17/18 boundary: Kessler 2005 reports US adult mean 16.7 (SD 9.0). The 17/18 boundary is the population median rounded to the nearest integer. Approximately 50% of US adults score below this.
35/36 boundary: The clinical sample (n=154 with confirmed ADHD diagnoses) reported mean 36.4 (SD 13.7). The 35/36 boundary is set such that a score of 36 places you at the clinical sample mean. Scores in the moderate band are consistent with diagnosed adults.
53/54 boundary: Clinical mean (36.4) plus 1.27 × SD (13.7) ≈ 53.8. The 53/54 boundary marks scores that are unusually high even by clinical standards, identifying the most severe symptom profiles.
What these bands are NOT
These cutpoints are not clinical thresholds in the sense that the GAD-7 ≥10 or PHQ-9 ≥10 boundaries function. They do not imply diagnostic certainty at any level. We use them to organize the score interpretation pedagogically and to anchor result copy. The 6-item ASRS Screener result (positive/negative) is the closer analog to a clinical threshold, and it is reported alongside the band severity in the tool's results panel.
Diagnostic probability per band
This is an LBL author-derived approximation. Values are derived from Kessler 2005 ROC data and post-screening confirmation rates, rounded for intuitive interpretation. They are explicitly labeled as approximate on the tool page and depend on the base rate of adult ADHD in the user's population (US adult prevalence ~4.4% per Kessler 2006).
| Band | Score | Approximate confirmed-ADHD rate |
|---|---|---|
| Minimal | 0–17 | ≈ 1 in 100 |
| Mild | 18–35 | ≈ 5 in 100 |
| Moderate | 36–53 | ≈ 50 in 100 |
| Severe | 54–72 | ≈ 85 in 100 |
Important caveat
These rates are approximate and depend on the base rate of adult ADHD in your specific population. They assume a primary-care-like base rate. In specialty mental-health populations the rates would be higher; in non-help-seeking general populations they would be lower. Treat them as ballparks for "what does my score generally mean," not as Bayesian posteriors.
Population norms
The norms below anchor your score relative to published population samples. The general-population norm anchors comparison to adults not seeking help; the clinical norm anchors to adults with confirmed ADHD diagnoses. The key intuition: a score around 36 puts you at the diagnosed-ADHD mean — the strongest signal short of formal evaluation.
| Population | Sample | Mean | SD | Reference |
|---|---|---|---|---|
| US adult general population | n = 966 | 16.7 | 9.0 | Kessler 2005 (NCS-R subsample) |
| US adults with confirmed ADHD diagnosis | n = 154 | 36.4 | 13.7 | Kessler 2005 |
| German general population | n = 1,003 | 14.9 | 9.6 | de Vries 2014 |
| Female (US, NCS-R) | ~500 | 16.0 | 9.0 | Kessler 2005 |
| Male (US, NCS-R) | ~466 | 17.4 | 9.0 | Kessler 2005 |
| Adult psychiatric outpatients | n = 60 | 32.1 | 14.2 | Adler 2006 |
Sex-stratified interpretation
US sex differences in ASRS total scores are small (~0.7–1.5 points on a 0–72 scale, slightly higher in males). Subscale-level patterns are more meaningful: men typically score slightly higher on Hyperactivity-Impulsivity, women slightly higher on Inattention. These patterns are consistent across replication samples and align with the broader epidemiological pattern that adult ADHD in women predominantly presents as inattentive (Quinn & Madhoo 2014).
Age-related considerations
Hyperactive-impulsive symptoms attenuate with age in adults with ADHD (Biederman 2000), while inattention typically persists. ASRS scores in older adults (60+) tend to be lower on the hyperactivity dimension than in younger adults with the same underlying clinical severity. The ASRS does not adjust for this; clinical interpretation should account for age.
Limitations
Self-report
Like all self-report instruments, the ASRS is subject to insight limitations, social desirability bias, and recall bias. Adults with ADHD sometimes under-report inattention (because attention difficulties are familiar and feel "normal") and sometimes over-report (when seeking diagnosis to access treatment). Informant ratings (partner, family) and clinician observation provide complementary perspectives that this self-screen cannot.
Past-6-months reference period
The instrument asks about symptoms over the past 6 months. This captures current functioning but not the developmental trajectory required for DSM-5 diagnosis (childhood-onset before age 12, persistence across settings). A high score on this screen with no childhood symptom history points to alternative explanations rather than ADHD specifically.
No comorbidity screening
The ASRS screens only for ADHD-symptom domains. Depression, anxiety, sleep disorders, substance use, and trauma can all produce ADHD-like cognitive symptoms in adulthood. The cross-tool referral system in the tool's results panel addresses this for the most common comorbidities (Sleep, Anxiety, Depression) but does not replace a comprehensive clinical evaluation.
The 5-items-at-Often threshold is approximate
The DSM-5 adult ADHD threshold is 5+ of 9 symptoms persisting for 6+ months. We adapt this to "5+ items at Often or Very Often" using item frequency as a surrogate for symptom-count. This adaptation is reasonable but not equivalent to a clinical interview. Some users with genuine ADHD may not cross the 5-items-at-Often threshold (e.g., 4 symptoms at Often plus 5 at Sometimes); the archetype matching would place them in The Tired category. Clinical judgment would correctly capture them as Predominantly Inattentive.
The 4 severity bands are author-choice
As noted in Section V, the bands are not clinical thresholds. Different population norms (e.g., German vs US) would shift the boundaries. The bands are pedagogical, not diagnostic.
Functional impairment is not assessed
DSM-5 requires that ADHD symptoms cause significant functional impairment in two or more settings. The ASRS does not include functional-impairment items (unlike the PHQ-9, which has a 10th functional-impairment question). A high symptom score without significant functional impairment may not warrant clinical diagnosis. Users should weight their results against their actual functional level.
Childhood-onset is not assessed
The DSM-5 childhood-onset requirement (symptoms before age 12) is the single biggest gap in adult self-screening. Adult-onset attention problems are not ADHD by current clinical convention; they are typically explained by depression, anxiety, sleep loss, hormonal changes, head injury, or chronic stress. The Wender Utah Rating Scale (childhood-retrospective) can complement the ASRS but is not currently implemented in this tool.
The 5 archetypes are interpretive
The Focused / Drifter / Dynamo / Kinetic Mind / Tired framework mirrors DSM-5 presentation specifiers but adds two LBL author-choice categories (Focused, Tired). It is not a published clinical typology. The pathways recommended for each archetype are evidence-based but the archetype assignment itself is a tool design choice.
Cannot replace clinical evaluation
The single most important limitation: this is a screen, not a diagnostic tool. A high score is a useful signal, not a clinical conclusion.
Independent review
This methodology and the corresponding tool implementation were reviewed by Eskezeia Y. Dessie, PhD — clinical reviewer for LifeByLogic — with particular attention to:
- 4-band severity threshold logic, given the absence of clinical-consensus bands for the ASRS
- The 5-archetype matching rule and the 5-items-at-Often-or-higher dominance threshold
- Cross-tool referral copy in The Tired archetype results, particularly the framing of alternative explanations vs primary ADHD
- The comorbidity callout in the results panel and the comorbidity-table figures
- The childhood-onset DSM-5 caveat and how it appears in tool results, methodology, and FAQ
- Severe-band recommendation language (whether it should require clinical evaluation, whether it should also recommend comorbidity screens)
- Sex-difference framing — particularly the Drifter archetype implications for women's adult ADHD presentation
- Whether any DSM-5 framing might be misread by users with bipolar I/II (where attention symptoms can also occur)
Eskezeia's clinical-tone changes take precedence over the original drafts. Any subsequent revisions to the tool or methodology will go through the same review pipeline before deploy.
Version log
v1.0 — 2026-05-06
Initial publication. Implements the full 18-item ASRS-v1.1 with 4 severity bands, 5 archetypes, derived 6-item screener, DSM-5 sub-dimension structure, comorbidity-aware results, and cross-tool referrals to LBL Sleep / Anxiety / Depression tools. Reviewed by Eskezeia Y. Dessie, PhD prior to deploy.
Versioning policy
Major version bumps (v2.0, v3.0) will be triggered by changes to: the instrument used, the severity-band cutpoints, the archetype matching algorithm, or the structure of the scoring formulas. A deprecation notice will be displayed on the tool page during the transition.
Minor version bumps (v1.1, v1.2) will track: language translations, additional FAQ entries, clarifications to existing copy, citation updates, and methodology document refinements that do not change the scoring outputs.
Patch version (no number bump) covers: typo corrections, broken-link fixes, accessibility improvements that do not change the rendered substance.
Key terms
Definitions and links to the LifeByLogic glossary entries for the constructs and instruments referenced in this methodology.
- Attention-Deficit/Hyperactivity Disorder (ADHD) — a neurodevelopmental disorder characterized by persistent inattention and/or hyperactivity-impulsivity that began in childhood and continues to cause functional impairment in adult life.
- ASRS Screener — the 18-item Adult ADHD Self-Report Scale, version 1.1 (and its embedded 6-item subset), developed by Kessler and colleagues in 2005 in collaboration with the World Health Organization.
- Inattention — the DSM-5 ADHD criterion-A1 symptom dimension, comprising 9 specific symptoms covering attention, organization, memory, listening, follow-through, and avoidance of mental effort.
- Hyperactivity-Impulsivity — the DSM-5 ADHD criterion-A2 symptom dimension, comprising 9 specific symptoms covering physical restlessness, talking, interrupting, and difficulty waiting.
- Presentation specifier — DSM-5 introduced three ADHD presentation labels (Predominantly Inattentive, Predominantly Hyperactive-Impulsive, Combined) replacing the DSM-IV "subtype" terminology. Reflects the recognition that the same disorder can present differently across individuals and within an individual across time.
- Comorbidity — the co-occurrence of two or more clinical conditions in the same individual. Adult ADHD has high comorbidity with depression (~19%), anxiety (~24%), sleep disorders (~25%), and substance use (~15%) per Kessler 2006.
- Effect size — standardized measure of the magnitude of a relationship or difference. The ASRS Screener achieves d ≈ 1.5–2.0 in distinguishing diagnosed ADHD from non-ADHD samples.
- Validated instrument — a measurement tool with established psychometric properties (reliability, validity, sensitivity, specificity) demonstrated across multiple peer-reviewed studies.
Methodology FAQ
Is the LBL author-choice severity band system clinically validated?
No — and this is documented explicitly. The ASRS does not have a clinical-consensus severity band system because the instrument was designed for binary screening, not severity grading. The four LBL bands (0–17 Minimal, 18–35 Mild, 36–53 Moderate, 54–72 Severe) are an explicitly-disclosed author choice anchored to the Kessler 2005 normative distribution. They are presented as a pedagogical aid for relating your score to general-population and clinical-population means, not as diagnostic thresholds.
Why does the archetype matching require 5 items at "Often" or higher, not 6 like in DSM-5?
DSM-5 requires 5 of 9 symptoms in adults (vs 6 of 9 in children). The lowered count for adults reflects the recognition that adults have typically developed compensation strategies that mask the full symptom expression. Our 5-items-at-Often-or-higher rule mirrors the DSM-5 adult requirement directly, using item frequency as the surrogate for clinical symptom-count. Items rated Sometimes or below are not counted because the DSM symptom-count threshold maps to clinical impairment at the higher frequencies.
Why isn't the 6-item ASRS Screener the primary measurement?
The 6-item screener is faster (~90 seconds) and validated for binary positive/negative classification, but it cannot distinguish DSM-5 presentation specifiers (Predominantly Inattentive vs Predominantly Hyperactive-Impulsive vs Combined). Of the 6 screener items, 4 are inattention items and only 2 are hyperactivity-impulsivity items — which under-represents the hyperactive dimension. Using the full 18-item form preserves the clinically meaningful sub-dimension structure that informs both treatment selection and the LBL archetype framework. The screener result is still computed and surfaced, alongside the dimensional profile.
How were the 5 archetypes derived?
Three of the five archetypes (The Drifter, The Dynamo, The Kinetic Mind) directly mirror the DSM-5 ADHD presentation specifiers (Predominantly Inattentive, Predominantly Hyperactive-Impulsive, Combined). Two are LBL author-choice categories: The Focused (total below population median, no concern) and The Tired (symptoms present without DSM-mapped dominance, suggesting alternative or comorbid causes). The matching rule is first-match-wins with the most-specific rules tested first. Full pseudocode and rule-order rationale are in Section III.
What evidence supports the cross-tool referrals from The Tired archetype?
The Tired archetype links to the LBL Sleep-Cognition Optimizer, Anxiety Test, and Depression Test because the comorbidity epidemiology (Kessler 2006) shows that adults with ADHD have ~25% concurrent sleep disorders, ~24% anxiety, and ~19% depression. When symptoms appear without DSM-5 dominance pattern, alternative explanations are statistically more likely than primary ADHD. Chronic sleep deprivation in particular produces a near-perfect mimic of inattentive ADHD. The cross-referrals are evidence-driven, not aesthetic.
Why no Spanish or other language translations yet?
v1.0 ships English-only. The ASRS-v1.1 has been translated into 35+ languages by the WHO, including a validated Spanish translation. LBL plans to add Spanish in a future version (v1.1 target) following the patterns of the validated Spanish ASRS-v1.1. No other languages are scheduled for initial release.
How is this methodology versioned?
This methodology is v1.0, published 2026-05-06. Future revisions will be tracked in the Version log section above with a brief description of what changed. Major changes (e.g., adding a new archetype, changing severity band cutpoints, restructuring the scoring algorithm) trigger a major version bump and a deprecation notice for the prior version. Minor changes (typo fixes, citation updates, clarifications) are tracked but don't trigger a version bump.
How to cite this methodology
If you reference this methodology document, the implementation, or the LBL-ADHD archetype framework in academic writing, public communication, or clinical materials, please cite the LBL methodology and the underlying ASRS-v1.1 instrument together.
Last reviewed: 2026-05-06. Methodology version 1.0. Next scheduled review: 2027-05-06.