WHODAS 2.0 — World Health Organization Disability Assessment Schedule
World Health Organization Disability Assessment Schedule 2.0 · Also known as: WHODAS-36, WHODAS-12
WHODAS 2.0 is a standardized, WHO-developed instrument that measures disability and functioning across six core life domains in any population aged 18 and above. Introduced in 2010, it operationalizes the biopsychosocial model of disability using the International Classification of Functioning (ICF) framework, making it applicable to chronic disease, physical injury, mental health, and aging contexts.
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When to use it
WHODAS 2.0 is indicated for (1) outcome measurement in clinical trials for any chronic condition (stroke, TBI, spinal cord injury, arthritis, depression, diabetes); (2) disability assessment in workers' compensation, insurance, or legal contexts; (3) program evaluation in rehabilitation or public health; (4) epidemiological surveys of population health; (5) individual functional status tracking. Validated from age 18 upward; not appropriate for pediatric populations without modification. Particularly valuable when comparing disability across conditions (e.g., HIV vs. depression vs. arthritis) because the ICF framework is universal.
Strengths & limitations
- Theoretically grounded in ICF biopsychosocial model: measures functioning, not diagnosis. Enables apples-to-apples comparisons across health conditions.
- Globally validated: translated and validated in 65+ countries; extensively normed in diverse cultures, healthcare systems, and populations.
- Flexible administration: 36-item full version, 12-item brief version, and modular options allow use in resource-limited or time-constrained settings.
- Psychometric rigor: strong internal consistency (Cronbach α 0.90–0.96), test-retest reliability (ICC 0.85–0.95), convergent validity with other disability measures (r 0.70–0.85).
- Practical utility: scores are interpretable by clinicians, insurance companies, and researchers. IRT scoring captures subtle change better than simple sum-scoring.
- Comprehensiveness: six domains capture the full range of disability (cognitive, physical, social, vocational) in a single instrument.
- No pediatric version validated for <18 years (separate WHODAS-Child exists but different psychometric profile).
- IRT scoring requires specialized software; simple paper-and-pencil scoring is less precise and loses information.
- Ceiling and floor effects in samples with very mild or very severe disability (near-perfect health or near-total dependence).
- Cultural equivalence: while translated widely, some concepts (e.g., 'work' or 'social participation') may not map identically to all cultures.
- Respondent burden: 36-item version takes 10–15 minutes; in very acutely ill or severely cognitively impaired populations, completion rate drops.
- Score changes of 8–10 points MCID are meaningful clinically, but may be undetectable in short-term trials or with small samples.
Frequently asked
How long does WHODAS 2.0 take to administer?
The 12-item short form takes 3–5 minutes. The 36-item full version typically takes 10–15 minutes in an interview format; self-completion may be slightly faster (5–10 minutes) for literate populations. Administration time varies by cognitive status and interview depth.
Can WHODAS 2.0 be used in children?
The standard WHODAS 2.0 is validated for adults aged 18 and above. The WHO has developed WHODAS-Child (ages 5–17) and WHODAS-Parent Proxy (parent-report), which use modified item wording and domains appropriate for children; these are distinct instruments with separate psychometrics.
What is the minimum clinically important difference (MCID)?
MCID varies by domain and condition. Typical estimates: 8–10 points per domain for general populations and many chronic conditions. Condition-specific studies may report larger MCIDs (e.g., 12–15 in stroke, 5–8 in depression). Always reference the MCID from your condition-specific literature, not generic estimates.
Is WHODAS 2.0 free to use?
Yes. WHODAS 2.0 is in the public domain and published by WHO; you may use it without license fees. The instrument itself is free; some software platforms charge for database integration or automated scoring, but the paper-and-pencil version is free.
How do I handle missing data on WHODAS?
If <10% of items in a domain are missing, mean-imputation is acceptable: calculate the mean of answered items in that domain and use it for the missing item(s). If >10% are missing in a domain, report that domain as incomplete. Document your imputation method. Some studies use item-response models for more sophisticated imputation; consult WHO guidance or your statistical advisor.
What's the difference between simple and IRT scoring?
Simple scoring: sum raw item scores (1–5) per domain, then rescale to 0–100. Quick, no software needed. IRT (Item Response Theory) scoring: uses WHO algorithms and software to weight items by their discrimination and difficulty, producing a latent disability score 0–100. IRT is more precise, avoids floor/ceiling bias, and is recommended for clinical trials. Simple scoring is acceptable for clinical monitoring and general program evaluation.
Can WHODAS be used to diagnose disability?
WHODAS 2.0 measures the extent of functional limitation, not diagnosis. It does not diagnose a condition (e.g., 'spinal cord injury' or 'depression'). It quantifies how much that condition (or any condition) affects daily life. Use alongside clinical diagnosis and objective impairment testing.
Is WHODAS culturally equivalent across countries?
WHODAS 2.0 was designed for cross-cultural use and is validated in 65+ countries. However, some concepts (work, social roles, family structure) may not be identical across cultures. Always use the official WHO translation for your language and culture. Be cautious when comparing scores between very different cultural contexts without culture-specific norming.
Sources
- World Health Organization. (2010). Measuring Health and Disability: Manual for WHO Disability Assessment Schedule (WHODAS 2.0). WHO Publications. link ↗
- Ustün, T. B., Kostanjsek, N., Chatterji, S., & Rehm, J. (2010). Measuring health and disability: Manual for the World Health Organization Disability Assessment Schedule (WHODAS 2.0). WHO. link ↗
How to cite this page
ScholarGate. (2026, June 3). World Health Organization Disability Assessment Schedule 2.0. ScholarGate. https://scholargate.app/en/rehabilitation-science/whodas-2
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