Arabic Behçet’s Disease Quality of Life Questionnaire

Abstract

The Arabic Behçet’s Disease Quality of Life Questionnaire (Arabic BD-QoL) is a specialized patient-reported outcome measure developed to assess health-related quality of life (HRQoL) among Arabic-speaking individuals diagnosed with Behçet’s disease. Originally devised in the United Kingdom, the instrument underwent rigorous cross-cultural translation, cognitive debriefing, and psychometric validation in Lebanon to ensure linguistic equivalence and structural fidelity. Behçet’s disease is a complex, chronic, systemic vasculitis characterized by recurrent oral aphthae, genital ulcerations, uveitis, cutaneous lesions, arthritis, and potential vascular, gastrointestinal, and central nervous system manifestations. Because generic health inventories frequently fail to detect the unique functional and psychosocial impairments triggered by these variable systemic manifestations, the disease-specific BD-QoL was developed to capture the full spectrum of patient-reported morbidity.

The Arabic BD-QoL comprises 30 self-administered items formatted with a dichotomous response structure (True/False). Psychometric evaluation confirms that the instrument operates within a unidimensional latent trait framework, wherein items aggregate into a single continuous indicator of disease-specific impairment ranging from 0 to 30. Internal consistency reliability is high, demonstrated by a Kuder-Richardson Formula 20 (KR-20) coefficient of 0.89. The scale displays strong temporal stability across repeated administrations, exhibiting a test-retest Spearman rank correlation coefficient of 0.91. Construct and convergent validity have been confirmed via statistically significant positive correlations with clinician-rated disease severity measures (r = 0.40) and functional disability assessments, including the Lawton Instrumental Activities of Daily Living (IADL) scale. The Arabic BD-QoL offers an empirically supported, rapidly administered metric for longitudinal clinical monitoring, cross-cultural comparative investigations, and therapeutic trials across Middle Eastern and North African clinical populations.

Keywords

Behçet’s disease, Quality of life, Cross-cultural adaptation, Psychometrics, Arabic BD-QoL, Rheumatology, Health-related quality of life, Patient-reported outcomes, Systemic vasculitis, Unidimensionality, Test-retest reliability, Internal consistency

Authors

The cross-cultural adaptation and psychometric validation of the Arabic Behçet’s Disease Quality of Life Questionnaire were conducted by an interdisciplinary team of clinical rheumatologists, epidemiologists, and public health researchers primarily affiliated with the American University of Beirut (AUB) and the American University of Beirut Medical Center (AUBMC):

• Zahi Touma, MD, PhD — Division of Rheumatology, American University of Beirut Medical Center, Beirut, Lebanon; currently affiliated with the University Health Network, University of Toronto, Toronto, Ontario, Canada (Email: [email protected]).
• Lilian Ghandour, PhD — Department of Epidemiology and Population Health, Faculty of Health Sciences, American University of Beirut, Beirut, Lebanon (Email: [email protected]).
• Abla Mehio Sibai, PhD — Department of Epidemiology and Population Health, Faculty of Health Sciences, American University of Beirut, Beirut, Lebanon (Email: [email protected]).
• Houry Puzantian, PhD, RN — American University of Beirut Medical Center, Beirut, Lebanon; currently affiliated with the School of Nursing, University of Pennsylvania, Philadelphia, Pennsylvania, USA (Email: [email protected]).
• Ayad Hamdan, MD — Division of Rheumatology, American University of Beirut Medical Center, Beirut, Lebanon (Email: [email protected]).
• Omar Hamdan, MD — Division of Rheumatology, American University of Beirut Medical Center, Beirut, Lebanon (Email: [email protected]).
• Jeanine Menassa, MD — Division of Rheumatology, American University of Beirut Medical Center, Beirut, Lebanon (Email: [email protected]).
• Imad Uthman, MD, MPH — Division of Rheumatology, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon (Email: [email protected]).
• Thurayya Arayssi, MD — Division of Rheumatology, American University of Beirut Medical Center, Beirut, Lebanon; currently affiliated with Weill Cornell Medicine-Qatar, Doha, Qatar (Email: [email protected]).

Purpose

The primary clinical and empirical purpose of adapting the BD-QoL into Arabic is to supply healthcare professionals and clinical trialists with a validated, disease-specific self-report instrument capable of indexing the nuanced personal impact of Behçet’s disease. Historically, epidemiological investigations and clinical trials in rheumatology have relied on clinical indices such as cutaneous lesion tallies, erythrocyte sedimentation rates, or physician global assessments. While these physiological parameters supply vital data regarding immunological flare-ups and biological damage, they do not inherently capture the day-to-day functional barriers, emotional distress, or social disruptions experienced by affected individuals.

Generic instruments, such as the Medical Outcomes Study 36-Item Short Form Health Survey (SF-36) or the EuroQol 5-Dimension scale (EQ-5D), provide valuable baseline comparisons across diverse pathologies. However, they frequently suffer from significant floor or ceiling effects and lack sensitivity to the unique symptom clusters characteristic of Behçet’s disease. For example, painful recurrent oral aphthae cause marked difficulty in basic physical functions such as chewing, swallowing, and speaking. Genital ulcers trigger intimate distress, social shame, and partnership conflicts, while sudden ocular inflammatory events (e.g., panuveitis or retinal vasculitis) provoke persistent anxiety over irreversible blindness. Generic quality of life measures lack the domain specificity to detect these acute, relapsing-remitting issues.

In clinical practice, the Arabic BD-QoL serves as a point-of-care screening and monitoring device. By evaluating the instrument during routine clinical encounters, rheumatologists can identify hidden burdens such as chronic fatigue, psychological distress, or isolation that might otherwise be obscured by stable laboratory markers. In academic and pharmacological research, the scale standardizes endpoints for randomized controlled trials assessing novel immunosuppressants, biologics, and targeted therapeutic interventions. Furthermore, establishing a culturally and linguistically sound Arabic tool enables multi-regional longitudinal research across the Middle East—a region historically demonstrating some of the highest global prevalence rates along the ancient “Silk Road” corridor—without confounding factors introduced by informal linguistic translations.

Psychological Construct

The underlying construct assessed by the Arabic BD-QoL is disease-specific health-related quality of life. Conceptually, health-related quality of life is a multidimensional construct reflecting an individual’s subjective appraisal of their physical, emotional, functional, and social well-being in the presence of illness and therapeutic interventions. Within the Arabic BD-QoL, this overarching construct is operationalized through an integrated, unidimensional continuum encompassing several interacting domains:

1. Physical Impairment and Basic Daily Functioning

This facet assesses the direct mechanical and somatic disruptions caused by mucosal, articular, and systemic inflammatory episodes. Painful oral ulcerations fundamentally alter food intake and verbal communication, forcing individuals to alter their diets or avoid eating entirely. Concurrently, musculoskeletal symptoms, including polyarthritis and arthralgia, impede functional ambulation and basic self-maintenance, leading to difficulties with walking long distances or managing household responsibilities.

2. Systemic Somatic Burden and Vitality

Persistent systemic fatigue is one of the most debilitating yet clinically underappreciated features of Behçet’s disease. The construct evaluates disruptions in vitality, including non-restorative nocturnal sleep, the involuntary requirement for daytime napping, generalized sluggishness, and the protracted time needed to perform routine everyday tasks. This persistent exhaustion occurs independent of active joint swelling or mucosal flare-ups.

3. Affective and Psychological Well-Being

The emotional domain taps into internal distress states arising from living with an unpredictable, painful, and potentially disfiguring chronic condition. The scale captures symptoms of psychological distress, demoralization, frustration, depressive mood, irritability, and sudden emotional lability (such as feeling overwhelmed or tearful). A primary cognitive component of this domain is catastrophic health anxiety, specifically the persistent dread of impending ocular complications or total vision loss, which impairs the patient’s perceived capacity to plan for the future.

4. Interpersonal, Romantic, and Social Connectedness

Behçet’s disease imposes substantial social strain. This dimension measures limitations in social participation, diminished recreational outings with peers, difficulties in maintaining romantic relationships, and challenges in expressing physical or emotional affection. Due to the recurrent and sensitive nature of genital lesions and visible skin eruptions, patients frequently report feelings of personal embarrassment, heightened self-consciousness, impaired self-confidence, and self-imposed social withdrawal leading to acute loneliness.

5. Functional Autonomy and Perceived Personal Control

Chronic inflammatory relapses undermine perceived self-efficacy and agency. This sub-domain captures the patient’s perceived loss of autonomy, manifested as an inability to maintain desired employment, an involuntary dependence on family members for daily support, and a generalized sense that their life circumstances are uncontrollable.

Theoretical Framework

The theoretical architecture of the BD-QoL is grounded in the Needs-Based Model of Quality of Life, initially conceptualized by Hunt and McKenna in the late 1980s and early 1990s. This model posits that life quality is directly tied to an individual’s capacity to fulfill fundamental human needs, as articulated in Abraham Maslow’s hierarchy of needs. According to this framework, health and medical treatments do not hold intrinsic value solely because they normalize biological biomarkers; rather, their ultimate value lies in their ability to restore the individual’s capacity to satisfy biological, psychological, social, and self-actualization needs.

When an active chronic illness like Behçet’s disease interferes with basic physiological drives (e.g., eating without pain, obtaining restful sleep), safety needs (e.g., preserving functional eyesight, sustaining employment, financial security), belongingness needs (e.g., engaging in social outings, sharing intimate affection), and self-esteem (e.g., retaining bodily confidence, autonomy, self-direction), the individual’s quality of life diminishes proportionally. In this framework, the severity of the illness is quantified by the number and extent of basic need fulfillments compromised by the condition.

Unlike classical psychometric inventories that weight items along complex frequency or intensity scales, the needs-based approach typically utilizes a dichotomous assessment structure. Patients affirm whether a specific life disruption, restriction, or distress state is currently true for them. Within modern measurement theory, this corresponds to a Rasch measurement model or Item Response Theory (IRT) philosophy: the 30 items are ordered along an underlying latent continuum of disease impact. Endorsing an item indicates that the patient’s disease-related limitation has reached or exceeded the specific severity threshold represented by that item.

Validity

The cross-cultural adaptation and psychometric validation of the Arabic BD-QoL followed international standard guidelines established by the Beaton and Guillemin protocols, as well as the International Society for Pharmacoeconomics and Outcomes Research (ISPOR) task force principles. Content and face validity were established through a multi-step forward-and-backward translation sequence involving independent bilingual linguists, clinical rheumatologists, and an expert review committee, followed by cognitive debriefing interviews with Behçet’s patients to confirm cultural acceptability, conceptual equivalence, and semantic clarity.

Empirical construct validity was established through several psychometric comparisons:

• Convergent Validity with Clinical Disease Severity: The Arabic BD-QoL demonstrated a statistically significant, moderate positive correlation with a standardized clinician-administered Behçet’s disease clinical severity score (r = 0.40, p < 0.05). In rheumatological research, moderate correlations between patient-reported outcomes and objective biological or clinician-rated indices are theoretically expected; subjective HRQoL captures personal coping reserves and social buffers that clinical pathology tallies overlook.
• External Validity with Functional Metrics: Construct validity was further substantiated through positive correlations with established measures of functional autonomy, specifically the Lawton Instrumental Activities of Daily Living (IADL) scale. Higher total scores on the Arabic BD-QoL correlated with increased functional dependence when performing complex instrumental tasks (e.g., housekeeping, medication management, transportation).
• Discriminant and Content Integrity: During cognitive evaluation and pilot testing, all items exhibited strong item-total coherence, confirming that the scale accurately discriminates between patients experiencing mild disease manifestations and those with severe, multi-organ exacerbations.

Reliability

The Arabic BD-QoL demonstrates high statistical reliability across both internal consistency and temporal stability metrics:

• Internal Consistency: Because the instrument employs a binary, dichotomous response format (True/False), internal consistency was determined using the Kuder-Richardson Formula 20 (KR-20)—the mathematical equivalent of Cronbach’s alpha for dichotomous variables. The resulting coefficient was 0.89, comfortably exceeding the accepted psychometric threshold of 0.70 for research and approaching the 0.90 standard recommended for individual clinical decision-making. This indicates that the 30 items exhibit strong inter-item relatedness and reliably capture a cohesive latent attribute.
• Test-Retest Reliability (Temporal Stability): Longitudinal stability was assessed over a short test-retest interval among clinically stable outpatients whose pharmacological regimens and clinical severity remained unchanged. The stability coefficient, evaluated using Spearman’s rank correlation coefficient (r_s), was 0.91 (p < 0.001). This demonstrates high reproducible precision over time, confirming that the Arabic BD-QoL is sensitive to genuine clinical changes rather than random measurement error.

Factor Analysis

The structural dimensionality of the 30-item Arabic BD-QoL was evaluated using Exploratory Factor Analysis (EFA) to verify whether the translated Arabic items preserved the single-factor structure identified in the original United Kingdom developmental study. The analytical findings demonstrated a clear convergence of all 30 items onto a primary latent dimension, confirming that the questionnaire functions as a unidimensional instrument. Factor loadings across the items supported the interpretation that diverse functional, psychological, and social items all index the single overarching latent construct of disease-related quality of life.

Methodologically, the primary validation study evaluated a clinical cohort of 41 consecutive Lebanese patients with Behçet’s disease. While the extraction of a single dominant factor aligns with the original Leeds validation by Gilworth and colleagues, psychometric literature typically recommends a higher participant-to-item ratio (e.g., 5:1 or 10:1) to ensure the stability of empirical factor loadings. Consequently, the original researchers noted that while EFA strongly supports unidimensionality, subsequent multi-center studies with larger cohorts are encouraged to conduct Confirmatory Factor Analysis (CFA) and examine item-fit statistics through Rasch or IRT modeling to refine individual item discrimination parameters.

Instrument / Measurement Tool

The operational specifications of the Arabic BD-QoL are summarized below:

• Test Type: Disease-specific Patient-Reported Outcome Measure (PROM); health-related quality of life self-report questionnaire.
• Clinical Population: Adult patients (aged 18 years and older) clinically diagnosed with Behçet’s disease according to established international diagnostic criteria (e.g., International Study Group for Behçet’s Disease).
• Item Count: 30 items.
• Format: Self-administered paper-and-pencil or digital questionnaire.
• Response Scale: Dichotomous response format (True = 1, False = 0).
• Administration Time: Approximately 5 to 10 minutes.
• Scoring Formula: Total Score = ∑ (All item responses where True = 1 and False = 0).
• Score Range: 0 to 30 points.
• Interpretation Guidelines: Higher cumulative scores reflect greater disease-induced functional disruption, emotional distress, and poorer health-related quality of life. Conversely, lower scores signify minimal quality of life impairment.
• Normative Reference Values: In the validation cohort of 41 consecutive Lebanese patients, the mean total score was 9.12 with a standard deviation (SD) of 6.69.

Permissions & Fee and Test Year

The original Behçet’s Disease Quality of Life Questionnaire (BD-QoL) was developed in the United Kingdom by Gilworth, Chamberlain, Bhakta, Haskard, Silman, and Tennant (published in 2004). The formal cross-cultural adaptation and psychometric validation of the Arabic version was completed and published in 2011 by Dr. Zahi Touma and colleagues at the American University of Beirut Medical Center, under formal permission granted by the developers of the original Leeds BD-QoL instrument.

The Arabic BD-QoL is generally accessible for non-commercial academic, observational, and clinical research purposes. In accordance with standard intellectual property protocols for health measurement instruments, investigators intending to use, adapt, or digitize the questionnaire for academic studies or clinical trials should contact the corresponding developers or copyright holders (such as the original Leeds development team or Dr. Zahi Touma) to obtain formal user agreements and scoring documentation.

References

The following academic publications document the development, adaptation, and psychometric evaluation of the BD-QoL and related clinical metrics:

• Beaton, D. E., Bombardier, C., Guillemin, F., & Ferraz, M. B. (2000). Guidelines for the process of cross-cultural adaptation of self-report measures. Spine, 25(24), 3186–3191. https://doi.org/10.1097/00007632-200012150-00014
• Bodur, H., Borman, P., Ozdemir, Y., Atan, C., & Kural, G. (2006). Quality of life and life satisfaction in patients with Behcet’s disease: Relationship with disease activity. Clinical Rheumatology, 25(3), 329–333. https://doi.org/10.1007/s10067-005-0046-8
• Gilworth, G., Chamberlain, M. A., Bhakta, B., Haskard, D., Silman, A., & Tennant, A. (2004). Development of the BD-QoL: A quality of life measure specific to Behcet’s disease. The Journal of Rheumatology, 31(5), 931–937.
• Guillemin, F., Bombardier, C., & Beaton, D. (1993). Cross-cultural adaptation of health-related quality of life measures: Literature review and proposed guidelines. Journal of Clinical Epidemiology, 46(12), 1417–1432. https://doi.org/10.1016/0895-4356(93)90142-N
• International Study Group for Behçet’s Disease. (1990). Criteria for diagnosis of Behcet’s disease. The Lancet, 335(8697), 1078–1080. https://doi.org/10.1016/0140-6736(90)92643-V
• Lawton, M. P., & Brody, E. M. (1969). Assessment of older people: Self-maintaining and instrumental activities of daily living. The Gerontologist, 9(3_Part_1), 179–186. https://doi.org/10.1093/geront/9.3_Part_1.179
• Streiner, D. L., & Norman, G. R. (2008). Health measurement scales: A practical guide to their development and use (4th ed.). Oxford University Press. https://doi.org/10.1093/acprof:oso/9780199231881.001.0001
• Touma, Z., Ghandour, L., Sibai, A. M., Puzantian, H., Hamdan, A., Hamdan, O., Menassa, J., Uthman, I., & Arayssi, T. (2011). Cross-cultural adaptation and validation of the Behçet’s Disease Quality of Life Questionnaire. BMC Medical Research Methodology, 11, Article 52. https://doi.org/10.1186/1471-2288-11-52
• Wild, D., Grove, A., Martin, M., Eremenco, S., McElroy, S., Verjee-Lorenz, A., & Erikson, P. (2005). Principles of good practice for the translation and cultural adaptation process for Patient-Reported Outcomes (PRO) measures: Report of the ISPOR Task Force for translation and cultural adaptation. Value in Health, 8(2), 94–104. https://doi.org/10.1111/j.1524-4733.2005.04054.x
• Yi, S. W., Kim, J. H., Lim, K. Y., Bang, D., Lee, S., & Lee, E. S. (2008). The Behcet’s disease quality of life: Reliability and validity of the Korean version. Yonsei Medical Journal, 49(5), 698–704. https://doi.org/10.3349/ymj.2008.49.5.698

Items of the Scale