OECD Long-Term Disability Questionnaire

Abstract

The OECD Long-Term Disability Questionnaire is a concise, 16-item instrument developed by the Organization for Economic Cooperation and Development (OECD) in 1981. Its primary function is to provide a standardized measure of physical and sensory functional limitation suitable for large-scale, cross-national population surveys. The scale assesses key areas of functioning, including mobility, dexterity, vision, and hearing, using a simple four-point response format. This instrument was crucial in the early efforts of the OECD Social Indicators Programme to establish comparable measures of well-being and disability prevalence across member countries.

Keywords

OECD, Disability, Long-Term Disability, Functional limitation, Population Survey, Activities of Daily Living, Mobility, Sensory Function, Questionnaire, 1981.

Authors

Organization for Economic Cooperation and Development (OECD), JR McWhinnie, RW Wilson, JM McNeil.

Purpose

The primary purpose of the OECD Long-Term Disability Questionnaire was to create a methodologically sound and internationally comparable tool for estimating the prevalence and severity of disability within the general populations of OECD member nations. Before this instrument, definitions and measures of disability varied widely, making cross-national comparisons problematic. This questionnaire aimed to standardize the measurement of functional limitations based on observable physical capacity rather than medical diagnosis.

The scale was specifically designed for integration into existing national census efforts or post-census surveys, requiring it to be brief, easily understood, and amenable to self-report or rapid interviewer administration. Its focus on long-term physical limitations helped policymakers assess the need for social support and health services related to chronic impairment.

Construct

The scale measures the construct of Long-Term Functional Limitation, which is defined as the difficulty or inability to perform basic physical and sensory tasks necessary for independent living. This construct aligns closely with the concept of Activities of Daily Living (ADLs) and instrumental activities, although it is slightly broader, encompassing sensory functions (vision and hearing) and gross motor skills (mobility and endurance).

The 16 items collectively map out four critical domains of functioning: 1) Sensory ability (vision and hearing), 2) Communication (speech), 3) Mobility and Endurance (walking, running, climbing stairs), and 4) Dexterity and Self-Care (dressing, cutting food, bending). By focusing on objective physical tasks, the scale minimizes cultural bias inherent in assessing subjective well-being or socially defined roles of disability.

Validity

The validity of the OECD instrument was primarily established through intensive content validity and cross-cultural development efforts. The scale was developed through a common development effort involving multiple OECD countries, ensuring that the defined tasks (e.g., walking 400 meters, reading newspaper print) held functional equivalence across diverse linguistic and cultural settings. This process involved extensive pre-testing and cognitive interviewing.

Furthermore, early studies, such as those by Wilson and McNeil (1981), provided preliminary evidence of criterion validity by comparing the results of the OECD items against more comprehensive disability measures in pretests. The scale demonstrated its ability to effectively screen populations for severe functional limitations, correlating well with other established disability indicators used at the time.

Reliability

Reliability studies related to the initial development of the OECD scale focused heavily on minimizing measurement error inherent in large population surveys. While specific Cronbach’s alpha scores are often detailed in the original technical reports (McWhinnie, 1981), the instrument’s design emphasizes test-retest reliability for individual items, ensuring that the reported capacity for a specific task remains stable over short periods.

The use of specific, measurable tasks (e.g., “carry an object of 5 kilos for 10 meters”) rather than vague self-assessments enhances the objectivity of the responses, thereby improving inter-rater reliability when the questionnaire is administered by different interviewers.

Factor Analysis

Although the OECD Long-Term Disability Questionnaire is often used as a single, cumulative index of functional limitation, initial analyses suggested that the 16 items naturally cluster into distinct factors reflecting different functional domains. Typically, factor analysis reveals groupings corresponding to Sensory Function (vision and hearing), Gross Mobility, and Fine Motor Skills/Self-Care.

This factor structure supports the scale’s utility in research, allowing analysts to differentiate between sensory impairments and physical mobility issues, which often require distinct policy interventions. The simple structure allows researchers flexibility in creating sub-scores or using the aggregated total score.

Instrument

Test Type: Self-report or interviewer-administered screening questionnaire.

Format: 16 items, utilizing a 4-point ordinal response scale: Yes, without difficulty; Yes, with minor difficulty; Yes, with major difficulty; and No, not able to.

Language Available: Developed for multilingual administration and translated into the official languages of various OECD member countries.

Population Group: General population, used specifically for epidemiological and public health surveys.

Age Group: Typically adults (age 16 or 18 and older).

Population Details: Used extensively in national health surveys, often as a precursor to more detailed disability assessments.

Test Methodology: The instrument is scored by assigning ordinal values (e.g., 1 to 4) to the response categories, allowing for the calculation of a total score representing the degree of functional limitation. Higher scores indicate greater levels of difficulty or inability to perform the listed tasks.

Keywords

Population surveys, Health measurement, Functional capacity, OECD Social Indicators Programme, ADL, Self-care, Mobility, Long-Term Disability.

Authors

Author ORCID Identifier: Not applicable (Organizational instrument; specific ORCIDs for 1981 authors not readily available).

Affiliation Email addresses: Not applicable (Organization for Economic Cooperation and Development).

Correspondence Address: OECD Headquarters, Paris, France.

Permissions & Fee and Test Year

The OECD Long-Term Disability Questionnaire was first developed and published in 1981 by the Organization for Economic Cooperation and Development. As a product of an international governmental organization for public policy research, the instrument is generally considered to be in the public domain and is widely available for use in research and public health applications without licensing fees. The original PDF outlining the context and application of this instrument can be downloaded here: www.a4ebm.org/sites/default/files/Measuring%20Health.pdf.

Reference’s

• McWhinnie‚ JR. (1981). Disability assessment in population surveys: results of the OECD common development effort. Rev Epidémiol Santé Publique‚ 29:413–419.

• McWhinnie‚ JR. (1981). Disability indicators for measuring well-being. Paris: OECD Social Indicators Programme.

• Wilson‚ RW.‚ McNeil‚ JM. (1981). Preliminary analysis of OECD disability on the pretest of the post census disability survey. Rev Epidémiol Santé Publique‚ 29:469–475.

• McDowell‚ Ian. (2006). Measuring Health: A Guide to Rating Scales and Questionnaires‚ Third Edition. OXFORD UNIVERSITY PRESS.

Items of the OECD Long-Term Disability Questionnaire

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

• 1. Is your eyesight good enough to read ordinary newspaper print? (with glasses if usually worn).

• 2. Is your eyesight good enough to see the face of someone from 4 meters? (with glasses if usually worn).

• 3. Can you hear what is said in a normal conversation with 3 or 4 other persons? (with hearing aid if you usually wear one).

• 4. Can you hear what is said in a normal conversation with one other person? (with hearing aid if you usually wear one).

• 5. Can you speak without difficulty?

• 6. Can you carry an object of 5 kilos for 10 meters?

• 7. Could you run 100 meters?

• 8. Can you walk 400 meters without resting?

• 9. Can you walk up and down one flight of stairs without resting?

• 10. Can you move between rooms?

• 11. Can you get in and out of bed?

• 12. Can you dress and undress?

• 13. Can you cut your toenails?

• 14. Can you (when standing)‚ bend down and pick up a shoe from the floor?

• 15. Can you cut your own food? (such as meat‚ fruit‚ etc.).

• 16. Can you both bite and chew on hard foods? (for example‚ a firm apple or celery).

The standard response options for these items are: Yes, without difficulty; Yes, with minor difficulty; Yes, with major difficulty; and No, not able to.