Roland (Morris) Disability Questionnaire

Abstract

The Roland-Morris Disability Questionnaire (RDQ, also known as the RMDQ) is one of the most widely utilized and rigorously validated patient-reported outcome measures (PROMs) designed to assess self-rated physical disability and functional limitation resulting from low back pain (LBP). Developed in 1983 by Martin Roland and Richard Morris through selective adaptation of the comprehensive Sickness Impact Profile (SIP), the RDQ isolates 24 specific activity limitations directly attributed to lumbar impairment. Each item is prefaced or qualified by the phrase “because of my back,” establishing causal attribution and differentiating back-specific functional restrictions from general health comorbidities or baseline physical inactivity. The instrument employs a straightforward dichotomous response format (Yes = 1, No = 0), yielding a total sum score ranging from 0 (absence of back-related disability) to 24 (maximum functional disability).

Extensive psychometric investigations conducted across primary care, secondary rehabilitation, and spinal surgery settings demonstrate that the RDQ possesses robust measurement properties. Internal consistency is high, with Cronbach’s alpha values consistently falling between 0.84 and 0.93. Test-retest reliability across stable intervals ranges from intraclass correlation coefficients (ICC) of 0.83 to 0.91. Construct and convergent validity are substantiated by strong correlations with the Oswestry Disability Index (ODI), the Physical Functioning subscale of the Short Form Health Survey (SF-36), and Visual Analogue Scales (VAS) for pain intensity. Furthermore, the RDQ exhibits exceptional responsiveness to longitudinal clinical change, featuring an established Minimal Clinically Important Difference (MCID) typically identified as a 30% reduction from baseline or an absolute improvement of 2.5 to 5 points. Its clinical economy, linguistic accessibility, and strong psychometric foundation make the RDQ a global gold standard in clinical trials, epidemiological surveys, and routine clinical spine practice.

Keywords

Roland-Morris Disability Questionnaire, Low Back Pain, Functional Disability, Patient-Reported Outcome Measures, Sickness Impact Profile, Psychometrics, Physical Impairment, Spinal Disorders, Construct Validity, Responsiveness, Minimal Clinically Important Difference, Musculoskeletal Assessment, Activity Limitation, Clinical Epidemiology, Health-Related Quality of Life

Authors

The Roland-Morris Disability Questionnaire was originally authored and published by Martin Roland and Richard Morris in 1983:

• Martin Roland, DM, FRCGP, FRCP: Emeritus Professor of Health Services Research at the University of Cambridge, United Kingdom. Professor Roland trained in medicine at the University of Oxford and practiced as a general practitioner for over three decades. His pioneering academic contributions focus on primary care quality assessment, healthcare systems redesign, and musculoskeletal epidemiology. He established the RDQ during his clinical and health services research tenures in London and Manchester.
• Richard Morris, MSc, PhD: Emeritus Professor of Medical Statistics and Clinical Epidemiology, previously affiliated with the Department of Primary Care and Population Health at University College London (UCL) and the University of Bristol, United Kingdom. Professor Morris provided the quantitative, epidemiological, and statistical architecture that guided the item reduction and validation methodologies underpinning the instrument.

Subsequent international cross-cultural adaptations and psychometric validations have involved prominent clinical researchers, notably G. J. M. G. van der Heijden (1991) and A. J. H. M. Beurskens (1995) for the Dutch validation, as well as collaborative validation cohorts worldwide across European, North American, Asian, and Latin American health contexts.

Purpose

The primary clinical and scientific purpose of the Roland-Morris Disability Questionnaire is to quantify self-perceived physical functional disability specifically induced by low back pain. While subjective pain intensity measurements, such as numeric rating scales or visual analogue scales, provide insights into nociceptive or neuropathic sensory input, they frequently fail to capture the multidimensional manner in which pain alters an individual’s ability to execute essential daily activities, maintain vocational obligations, and sustain independent living. The RDQ was designed to bridge the gap between biological impairment and behavioral limitation, offering a standardized metric that reflects how pain disrupts daily life.

In routine clinical practice, the RDQ serves several functions:

• Baseline Functional Staging: It allows primary care clinicians, physiatrists, orthopedists, physical therapists, and chiropractors to rapidly evaluate the baseline functional impact of an acute, subacute, or chronic lumbar episode.
• Monitoring Treatment Trajectories: By administering the questionnaire at scheduled follow-up visits, clinicians can track response to conservative pharmacotherapy, rehabilitation, interventional pain procedures, or surgical interventions.
• Guiding Rehabilitation Goals: Examining specific positive endorsements (e.g., difficulty climbing stairs, needing assistance to put on socks, or staying in bed) helps multidisciplinary teams design tailored physical restoration interventions that target specific functional deficits.

In clinical trials and epidemiological research, the RDQ functions as a primary or secondary endpoint. Clinical trial guidelines, such as those recommended by the Initiative on Methods, Measurement, and Pain Assessment in Clinical Trials (IMMPACT) and international spine research consortia (Deyo et al., 1998; Bombardier, 2000), mandate the inclusion of back-specific physical disability scales in low back pain clinical trials. The RDQ is especially valuable in primary care and outpatient settings where patients exhibit mild-to-moderate disability, as it avoids some of the substantial floor effects observed when using instruments originally developed for severe or institutionalized populations.

The theoretical rationale for the RDQ rests on the premise that disease-specific outcome measures are more clinically responsive and conceptually coherent than generic health status instruments. By qualifying every item with “because of my back,” the instrument prevents confounding from comorbid medical conditions (such as cardiovascular limitations, respiratory illnesses, or unrelated joint pathology), ensuring that detected functional changes directly reflect spinal recovery or deterioration.

Psychological Construct

The overarching psychological and behavioral construct quantified by the Roland-Morris Disability Questionnaire is Low Back Pain-Specific Physical Functional Disability. In psychometric and epidemiological terminology, functional disability refers to the degree to which an individual’s physical capacity to perform everyday tasks, personal care, and social roles is curtailed as a direct consequence of pain and underlying spinal impairment. Rather than assessing unobservable physiological damage or subjective pain intensity, the construct operationalizes observable pain behaviors, somatic limitations, and self-reported performance deficits.

Although the RDQ is traditionally scored as a unidimensional summary score, structural psychometric analyses reveal that it covers several functional and behavioral domains. These domains reflect the multi-faceted nature of physical disability:

1. Basic Mobility and Ambulation

This domain captures gross motor functions required to navigate the physical environment. Items assess disruptions in the speed and duration of walking, reliance on assistive structures, and positional transitions. Specific items include:

• Item 3 (“I walk more slowly than usual because of my back”) and Item 17 (“I walk only short distances because of my back pain”), which capture reduced endurance and antalgic gait patterns.
• Item 5 (“Because of my back, I use a handrail to get upstairs”) and Item 23 (“Because of my back, I go upstairs more slowly than usual”), evaluating biomechanical challenges during vertical ascension against gravity.
• Item 7 (“Because of my back, I have to hold on to something to get out of an easy chair”), Item 10 (“I only stand up for short periods of time because of my back”), and Item 12 (“I find it difficult to get out of a chair because of my back”), which reflect load-bearing spinal intolerance and impaired sit-to-stand kinematics.

2. Self-Care and Activities of Daily Living (ADLs)

This dimension encompasses fine and gross functional tasks required for personal independence and domestic maintenance. These activities involve trunk flexion, rotation, and sustained mechanical loading:

• Item 4 (“Because of my back, I am not doing any jobs that I usually do around the house”) and Item 21 (“I avoid heavy jobs around the house because of my back”), which measure household activity reduction and protective avoidance behavior.
• Item 9 (“I get dressed more slowly than usual because of my back”), Item 16 (“I have trouble putting on my socks (or stockings) because of the pain in my back”), and Item 19 (“Because of back pain, I get dressed with help from someone else”), which evaluate self-care autonomy. Items 16 and 19 serve as sensitive markers of restricted lumbar flexion and pelvic tilt.
• Item 11 (“Because of my back, I try not to bend or kneel down”), capturing protective movement strategies commonly associated with fear of symptom exacerbation.

3. Static Postural Maintenance, Rest, and Sleep

Musculoskeletal spinal disorders interfere with static postures, resting behaviors, and nocturnal physiology:

• Item 2 (“I change position frequently to try and get my back comfortable”) and Item 20 (“I sit down for most of the day because of my back”), highlighting compensatory strategies to relieve intradiscal pressure or facet joint loading.
• Item 6 (“Because of my back, I lie down to rest more often”), Item 14 (“I find it difficult to turn over in bed because of my back”), Item 18 (“I sleep less well because of my back”), and Item 24 (“I stay in bed most of the time because of my back”), which capture sleep fragmentation, nocturnal mechanical pain, and prolonged recumbency indicative of severe functional disruption.

4. Psychosocial, Interpersonal, and Somatic Manifestations

Although the RDQ is predominantly a physical measure, physical pain invariably impacts psychological functioning, appetite, and social interactions:

• Item 1 (“I stay at home most of the time because of my back”) and Item 8 (“Because of my back, I try to get other people to do things for me”), capturing social withdrawal, domestic role alteration, and functional dependency.
• Item 13 (“My back is painful almost all of the time”) and Item 15 (“My appetite is not very good because of my back”), reflecting severe, constant somatic distress and systemic stress responses.
• Item 22 (“Because of back pain, I am more irritable and bad tempered with people than usual”), which explicitly targets the emotional strain, affective distress, and relational friction provoked by chronic physical suffering.

Theoretical Framework

The conceptual foundation of the Roland-Morris Disability Questionnaire is grounded in the evolution of modern medical sociology, the Biopsychosocial Model of illness, and disability conceptual frameworks established by the World Health Organization (WHO).

1. The Sickness Impact Profile and Health Status Theory

The RDQ was derived directly from the Sickness Impact Profile (SIP), developed by Marilyn Bergner and colleagues in the 1970s. The SIP was conceived as a behaviorally based measure of health-related dysfunction, operating on the premise that illness manifests objectively through changes in everyday behavior rather than solely through biochemical or radiological abnormalities. Roland and Morris reasoned that while the full 136-item SIP was too cumbersome for routine clinical practice, isolating items with high relevance to mechanical back dysfunction would yield an efficient, highly sensitive instrument tailored for clinical and research settings.

2. The Biopsychosocial Model of Musculoskeletal Pain

Historically, orthopedic medicine relied heavily on a biomedical paradigm that assumed a direct linear relationship between structural pathology (such as disc degeneration, herniation, or osteophyte formation observed on radiographs) and reported pain or functional incapacity. However, extensive clinical epidemiology has demonstrated that structural imaging findings correlate poorly with disability. In response, Gordon Waddell (1987) and other spine researchers advanced George Engel’s (1977) biopsychosocial framework to low back pain.

Within this framework, pain is recognized as a complex subjective perception influenced by psychological factors, cognitive appraisals, and environmental context. The RDQ operationalizes the behavioral manifestation of this biopsychosocial state. By measuring what patients actually do (e.g., resting, avoiding household tasks, modifying gait) rather than what they believe their spine can tolerate mechanically, the RDQ aligns closely with the behavioral dimensions of chronic pain theory.

3. The WHO Classification of Functioning, Disability and Health (ICF)

Under the WHO’s International Classification of Functioning, Disability and Health (ICF), functional status is conceptualized across three interconnected levels:

• Body Functions and Structures: Anatomical and physiological integrity (e.g., spinal biomechanics, nerve root compression, muscular spasm).
• Activities: Execution of specific tasks by an individual (e.g., walking, bending, dressing, climbing stairs).
• Participation: Involvement in broader life situations, domestic maintenance, occupational duties, and social relationships.

The RDQ operates predominantly at the level of Activity Limitations, with several items extending into Participation Restrictions (such as household labor and social contact). By distinguishing activity limitations from underlying spinal pathology, the RDQ provides a standardized operationalization of functional status that aligns with modern international classifications of disability.

4. Behavioral and Fear-Avoidance Models

The RDQ reflects core tenets of operant conditioning (Fordyce, 1976) and the Fear-Avoidance Model of chronic pain (Vlaeyen & Linton, 2000). According to fear-avoidance theory, individuals who interpret pain catastrophically often develop kinesiophobia (fear of movement), leading to safety-seeking behaviors, hypervigilance, and broad activity avoidance. Several RDQ items (e.g., Item 11: “I try not to bend or kneel down”; Item 21: “I avoid heavy jobs around the house”) directly reflect these protective behavioral adaptations. Consequently, the RDQ captures not only raw physical impairment but also cognitive-behavioral adaptations to anticipated pain.

Validity

The psychometric validity of the Roland-Morris Disability Questionnaire has been investigated across hundreds of studies, encompassing thousands of participants across diverse healthcare settings and cultural populations.

1. Construct and Convergent Validity

Construct validity refers to the extent to which an instrument aligns with established measures of related constructs. The convergent validity of the RDQ is supported by moderate-to-strong correlations with other validated spine and functional status measures:

• Correlation with the Oswestry Disability Index (ODI): Numerous investigations report Pearson or Spearman correlation coefficients between the RDQ and the ODI ranging from r = 0.70 to 0.85 (e.g., Leclaire et al., 1997; Roland & Fairbank, 2000). While the ODI contains more explicit inquiries regarding lifting, sitting tolerance, personal hygiene, and sexual activity, both instruments converge on the primary construct of spine-related functional disability.
• Correlation with Pain Severity: Cross-sectional correlations between the RDQ and Visual Analogue Scales (VAS) or Numeric Rating Scales (NRS) for back pain intensity typically range from r = 0.45 to 0.65 (Stratford et al., 1996; Beurskens et al., 1995). The moderate nature of this correlation supports construct validity, demonstrating that while pain severity drives functional disability, disability represents an independent construct that cannot be inferred from pain intensity alone.
• Correlation with Generic Quality of Life Scales: The RDQ exhibits strong negative correlations with the Physical Functioning (PF) subscale of the SF-36 (ranging from r = -0.65 to -0.80), and moderate correlations with the Role Physical (RP) and Bodily Pain (BP) subscales.

2. Discriminant (Divergent) Validity

Discriminant validity is demonstrated by weaker associations between the RDQ and unrelated or distinct health constructs. When compared to the Mental Health (MH) and Role Emotional (RE) subscales of the SF-36, RDQ correlation coefficients are substantially lower, typically ranging between r = -0.20 and -0.38. This shows that the instrument specifically evaluates physical activity limitation rather than general psychological distress or affective psychopathology.

Furthermore, the RDQ demonstrates known-groups validity by distinguishing between:

• Working individuals versus those on temporary or permanent disability leave due to back conditions.
• Patients managed in primary care (who typically show mean baseline RDQ scores of 9 to 12) versus surgical candidates evaluated in tertiary spinal clinics (who often exhibit mean baseline RDQ scores of 14 to 18).
• Individuals with localized axial mechanical low back pain versus those with concurrent radiculopathy and neurological deficits.

3. Predictive Validity

Baseline RDQ scores hold predictive value regarding long-term clinical prognosis, work resumption, and healthcare utilization. Research consistently shows that patients with elevated baseline RDQ scores (e.g., scores exceeding 14 to 16 in primary care) face a higher risk of chronicity, prolonged work absenteeism, and higher healthcare costs over 6- to 12-month follow-up windows (Pengel et al., 2003). Conversely, rapid declines in RDQ scores during the first four to six weeks of acute treatment predict favorable long-term functional recovery.

4. Responsiveness and Sensitivity to Change

Responsiveness—the ability of an instrument to detect clinically meaningful change over time—is a primary strength of the RDQ. In primary care cohorts undergoing conservative therapy or natural recovery, the RDQ frequently matches or exceeds the responsiveness of the Oswestry Disability Index. Standardized Response Means (SRM) and effect sizes across active treatment cohorts typically range from 0.80 to 1.25, indicating high sensitivity to functional improvement.

Extensive consensus work by the international back pain research community (Ostelo et al., 2008; Deyo et al., 1998) has established clear benchmarks for clinical interpretability:

• Minimal Clinically Important Difference (MCID): A reduction of 2.5 to 5 points on the 0–24 scale, or approximately a 30% improvement from baseline score, represents the threshold for a clinically meaningful functional recovery perceived by patients.
• Baseline Dependence: For patients with mild baseline impairment (scores < 8), a change of 2 to 3 points often reflects meaningful progress; for patients with severe baseline limitation (scores > 16), an improvement of 5 to 8 points may be required to achieve equivalent clinical significance.

Reliability

The reliability of the Roland-Morris Disability Questionnaire has been demonstrated across diverse patient populations, multiple language translations, and various clinical contexts.

1. Internal Consistency

Internal consistency reflects the degree of inter-relatedness among the questionnaire items. Across the published literature, Cronbach’s alpha coefficients for the full 24-item RDQ range between 0.84 and 0.93:

• In Roland and Morris’s initial validation cohorts, high internal consistency was observed, supporting the practice of combining items into a single composite score.
• In the Dutch validation by van der Heijden et al. (1991) and Beurskens et al. (1995), Cronbach’s alpha was determined to be 0.86 and 0.89, respectively.
• Subsequent validations across German, Spanish, French, Portuguese, Turkish, and Japanese translations report internal consistency estimates consistently above the accepted threshold of 0.80 for group comparisons and 0.85 for individual patient monitoring.

Item-total correlations across the 24 items generally range from 0.35 to 0.70. Rare items exhibiting lower item-total correlations (such as Item 15: “My appetite is not very good because of my back” or Item 22: “Because of back pain, I am more irritable and bad tempered with people than usual”) reflect less common systemic or psychological responses to mechanical pain, but they remain included due to their clinical sensitivity among severely disabled subsets.

2. Test-Retest Reliability

Test-retest stability assesses the reproducibility of scores when clinical status remains unchanged. Across varying re-administration windows:

• Short intervals (same day to 24 hours): Pearson r and Intraclass Correlation Coefficients (ICC) range from 0.88 to 0.93. In the original 1983 study by Roland and Morris, re-administration to 14 patients on the same day yielded a correlation coefficient of r = 0.91.
• Moderate intervals (1 to 2 weeks): In clinically stable patients undergoing sham intervention or waitlist tracking, ICC values range between 0.83 and 0.91 (Stratford et al., 1996; Beurskens et al., 1995).

3. Measurement Precision: SEM and MDC

Beyond correlation coefficients, modern psychometrics evaluates instrument precision using the Standard Error of Measurement (SEM) and the Minimal Detectable Change (MDC, also termed the Smallest Detectable Change):

• Standard Error of Measurement (SEM): Typically calculated between 1.2 and 1.8 points on the 24-point scale.
• Minimal Detectable Change at 95% confidence (MDC₉₅): Consistently established across multiple cohorts as falling between 3.5 and 4.5 points. This indicates that an individual patient must demonstrate a score change of at least 4 points to ensure with 95% statistical certainty that the observed variation reflects true functional change rather than measurement error.

Factor Analysis

Although the Roland-Morris Disability Questionnaire is scored clinically as a single aggregate unidimensional scale, empirical research employing Exploratory Factor Analysis (EFA), Confirmatory Factor Analysis (CFA), and modern Item Response Theory (IRT) reveals structural nuances.

1. Exploratory Factor Analysis (EFA)

Early exploratory factor analyses often challenged strict unidimensionality, extracting between two and six underlying factors depending on patient chronicity, language translation, and clinical setting. Commonly identified factors include:

• Factor 1: Gross Physical Mobility & Ambulation (Items 3, 5, 7, 10, 12, 17, 20, 23). This factor represents the physical core of the scale, explaining the largest share of variance (typically 25% to 35%).
• Factor 2: Activities of Daily Living and Flexibility (Items 4, 9, 11, 16, 19, 21), loading heavily on lumbar flexion, personal dressing, and domestic chore performance.
• Factor 3: Severe Disability and Bed Rest (Items 1, 6, 14, 24), characterizing profound functional limitation and extensive daytime recumbency.
• Factor 4: Somatosensory and Psychosocial Impact (Items 8, 13, 15, 18, 22), capturing unremitting pain, sleep fragmentation, appetite reduction, irritability, and reliance on social support.

2. Confirmatory Factor Analysis (CFA)

Subsequent structural equation modeling and CFA studies comparing unidimensional, multidimensional, and higher-order hierarchical models have provided valuable structural insights. While a simple single-factor model often yields acceptable fit indices in mild-to-moderate primary care samples (Root Mean Square Error of Approximation [RMSEA] ≈ 0.05–0.07; Comparative Fit Index [CFI] ≈ 0.90–0.94), bifactor models demonstrate superior statistical fit:

• In a bifactor framework, a single, dominant general factor (“Global Physical Disability”) accounts for the majority of the common variance (often > 70%), while minor orthogonal group factors capture residual item correlations among specific behaviors (e.g., stair climbing, dressing, or sleep).
• Because the general factor accounts for the vast majority of explained variance, psychometricians generally conclude that the single summary score remains conceptually justified for research and clinical communication.

3. Rasch Analysis and Item Response Theory (IRT)

Modern Rasch and IRT modeling have yielded valuable insights into item difficulty hierarchies and the calibration of the RDQ continuum:

• Item Difficulty Hierarchy: Rasch analysis orders items along a standardized logit continuum according to difficulty (severity of disability required to endorse the item). Items representing mild limitations (e.g., Item 2: “I change position frequently…” and Item 11: “I try not to bend or kneel down”) possess low logit difficulty thresholds and are endorsed by nearly all symptomatic patients. Conversely, items such as Item 24 (“I stay in bed most of the time…”), Item 19 (“…I get dressed with help from someone else”), and Item 15 (“My appetite is not very good…”) possess high logit values, endorsed only by patients experiencing severe functional impairment.
• Targeting and Floor/Ceiling Effects: Rasch person-item targeting confirms that the RDQ is well-targeted for primary care and ambulatory outpatient cohorts with mild-to-moderate low back pain. However, ceiling effects may occur in severe tertiary surgical candidates (where items may fail to differentiate between severe levels of impairment), while slight floor effects may emerge in elite athletes or occupational cohorts with minor pain presentations.

Instrument / Measurement Tool

• Instrument Name: Roland-Morris Disability Questionnaire (RDQ / RMDQ)
• Instrument Alternate Names: Roland Disability Questionnaire; The Roland Back Pain Disability Scale
• Original Authors: Martin Roland and Richard Morris (1983)
• Target Population: Adults (18+ years) and older adults experiencing acute, subacute, or chronic low back pain, with or without associated lower extremity radiation (sciatica / lumbar radiculopathy)
• Primary Construct Measured: Self-reported physical functional disability and activity limitation attributed to low back pain
• Test Type: Patient-Reported Outcome Measure (PROM); health status questionnaire
• Administration Mode: Self-administered (paper-and-pencil, computer-based, or mobile digital interface); may also be administered via structured clinical interview
• Completion Time: Approximately 3 to 5 minutes
• Number of Items: 24 items
• Response Scale: Dichotomous (Yes = 1, No = 0 / checked if item describes the respondent today)
• Scoring Methodology: Total score is calculated by summing the total number of checked items. Each endorsed item receives 1 point; unendorsed items receive 0 points. Total sum score ranges from 0 (indicating no functional disability) to 24 (indicating severe functional disability).
• Score Interpretive Benchmarks:
  • 0 to 8: Mild back-related functional disability
  • 9 to 16: Moderate functional disability (typical primary care baseline)
  • 17 to 24: Severe functional disability (typical tertiary spine clinic / surgical baseline)
• Primary Psychometric Thresholds: Minimal Clinically Important Difference (MCID) = 2.5 to 5 points (or ≥ 30% reduction from baseline); Smallest Detectable Change (MDC₉₅) = 3.5 to 4.5 points; Standard Error of Measurement (SEM) ≈ 1.2 to 1.8 points.

Permissions & Fee and Test Year

The Roland-Morris Disability Questionnaire was first published in 1983 in the peer-reviewed medical journal Spine (Volume 8, Issue 2, pages 141–144). The questionnaire was placed in the public domain by its originators to encourage standardized measurement and clinical research into back pain disorders.

Under the conditions established by Martin Roland and the scientific community:

• Licensing and Royalties: The instrument is free of charge and may be used without royalty payments for individual clinical patient care, non-profit academic research, epidemiological surveys, and commercial clinical trials.
• Modification Restrictions: To maintain comparability across studies and preserve established psychometric properties, researchers and clinicians are advised to administer the scale without altering item wording, response formats, or qualifying clauses (“because of my back”). Adding or omitting items alters the underlying measurement properties and invalidates standard normative cutoffs.
• Translations and Adaptations: Numerous cross-culturally validated translations exist worldwide (including Dutch, Spanish, French, German, Italian, Portuguese, Japanese, Chinese, Arabic, and Scandinavian languages). Users should select translations published and validated in peer-reviewed literature following standard forward-backward translation guidelines.
• Citation Requirement: Proper academic attribution must be provided in all published works, citing the original seminal publication (Roland & Morris, 1983).

References

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• Beurskens, A. J. H. M., de Vet, H. C. W., & Koke, A. J. A. (1996). Responsiveness of functional status in low back pain: A comparison of different instruments. Pain, 65(1), 71–76. https://doi.org/10.1016/0304-3959(95)00149-2
• Bombardier, C. (2000). Outcome assessments in the evaluation of treatment of subacute and chronic low back pain. Spine, 25(24), 3100–3103. https://doi.org/10.1097/00007632-200012150-00003
• Deyo, R. A., Battie, M., Beurskens, A. J., Bombardier, C., Croft, P., Koes, B., Malmivaara, A., Roland, M., Von Korff, M., & Waddell, G. (1998). Outcome measures for low back pain research: A proposal for standardized measure. Spine, 23(18), 2003–2013. https://doi.org/10.1097/00007632-199809150-00018
• Engel, G. L. (1977). The need for a new medical model: A challenge for biomedicine. Science, 196(4286), 129–136. https://doi.org/10.1126/science.847460
• Fordyce, W. E. (1976). Behavioral Methods for Chronic Pain and Illness. C.V. Mosby Company.
• Leclaire, R., Blier, F., Fortin, L., & Proulx, R. (1997). A cross-sectional study comparing the Oswestry and Roland-Morris Functional Disability Indexes in Canadian French. Spine, 22(19), 2311–2316. https://doi.org/10.1097/00007632-199710010-00023
• Ostelo, R. W., Deyo, R. A., Stratford, P., Waddell, G., Croft, P., Von Korff, M., Bouter, L. M., & de Vet, H. C. (2008). Interpreting change scores for pain and functional status in low back pain: Towards international consensus regarding minimal important change. Spine, 33(1), 90–94. https://doi.org/10.1097/BRS.0b013e31815e3a10
• Pengel, L. H., Herbert, R. D., Maher, C. G., & Refshauge, K. M. (2003). Acute low back pain: Systematic review of its prognosis. BMJ, 327(7410), 323. https://doi.org/10.1136/bmj.327.7410.323
• Roland, M., & Fairbank, J. (2000). The Roland-Morris Disability Questionnaire and the Oswestry Disability Questionnaire. Spine, 25(24), 3115–3124. https://doi.org/10.1097/00007632-200012150-00006
• Roland, M., & Morris, R. (1983). A study of the natural history of back pain: Part I: Development of a reliable and sensitive measure of disability in low-back pain. Spine, 8(2), 141–144. https://doi.org/10.1097/00007632-198303000-00004
• Stratford, P. W., Binkley, J., Solomon, P., Finch, E., & Gill, C. (1996). Assessing change in patients with low-back pain: How many change points represent a change in status? Physical Therapy, 76(2), 148–157. https://doi.org/10.1093/ptj/76.2.148
• van der Heijden, G. J., Beurskens, A. J., Koes, B. W., Assendelft, W. J., de Vet, H. C., & Bouter, L. M. (1991). De Roland-Morris Vragenlijst voor functionele status bij lage-rugpijn: Betrouwbaarheid en validiteit van de Nederlandse versie [The Roland-Morris Questionnaire for functional status in low-back pain: Reliability and validity of the Dutch version]. Nederlands Tijdschrift voor Fysiotherapie, 101, 190–198.
• Vlaeyen, J. W., & Linton, S. J. (2000). Fear-avoidance and its consequences in chronic musculoskeletal pain: A state of the art. Pain, 85(3), 317–332. https://doi.org/10.1016/S0304-3959(99)00242-0
• Waddell, G. (1987). 1987 Volvo award in clinical sciences: A new clinical model for the treatment of low-back pain. Spine, 12(7), 632–644. https://doi.org/10.1097/00007632-198709000-00002

Items of the Scale