Clinical Overview
The Quality of Life Enjoyment and Satisfaction Questionnaire (Q-LES-Q©) is a comprehensive, validated psychiatric assessment instrument developed by Dr. Jean Endicott at Columbia University. This self-administered questionnaire measures the degree of enjoyment and satisfaction experienced by individuals across multiple domains of daily functioning, providing clinicians and researchers with crucial insights into subjective well-being and functional outcomes in psychiatric populations.
The Q-LES-Q© addresses a critical gap in psychiatric assessment by quantifying quality of life beyond traditional symptom-focused measures. Available in multiple formats including the original 93-item version, short form (Q-LES-Q-SF), and abbreviated versions, this instrument captures patient-reported outcomes across physical health, feelings, work, household duties, school/coursework, leisure activities, and social relationships. The scale’s robust psychometric properties and sensitivity to treatment-related changes make it an essential tool for comprehensive psychiatric evaluation, treatment monitoring, and outcomes research in both clinical and research settings.
Key Validation Points
- Extensive Psychometric Validation – Demonstrated excellent reliability (Cronbach’s alpha > 0.90) and strong test-retest stability across multiple psychiatric populations including depression, anxiety, schizophrenia, and bipolar disorder
- Multi-Population Studies – Validated across diverse clinical samples including adults, adolescents, and pediatric populations (PQ-LES-Q), with established norms for both psychiatric patients and healthy controls
- Convergent and Discriminant Validity – Strong correlations with established quality of life measures and appropriate differentiation from symptom severity scales, confirming its unique contribution to clinical assessment
- Treatment Sensitivity – Proven responsiveness to therapeutic interventions in clinical trials, demonstrating significant sensitivity to detect improvements in quality of life following pharmacological and psychotherapeutic treatments
- International Recognition – Widely adopted in psychiatric research globally with translations available in multiple languages and inclusion in major clinical trial protocols
- Database Indexing – Extensively cited in PubMed-indexed publications with over 500 peer-reviewed studies supporting its clinical utility and research applications
Primary Use Cases
- Clinical Trial Endpoint Measurement – Primary and secondary outcome measure in pharmaceutical trials for antidepressants, antipsychotics, and mood stabilizers, providing FDA-recognized patient-reported outcome data
- Treatment Response Monitoring – Longitudinal assessment of functional improvement and quality of life changes throughout psychiatric treatment, complementing traditional symptom rating scales
- Comparative Effectiveness Research – Evaluation of treatment modalities and interventions across different psychiatric conditions, supporting evidence-based practice decisions and healthcare policy development
- Clinical Practice Integration – Routine assessment tool for comprehensive psychiatric evaluation, treatment planning, and ongoing care management in both inpatient and outpatient settings
- Outcomes Research Applications – Population health studies, health economics research, and quality improvement initiatives requiring validated quality of life measurement in psychiatric populations
Licensing Information
Professional Licensing Available
This validated psychiatric rating scale is available for licensing to qualified organizations, research institutions, and clinical practices. Our licensing agreements provide you with the legal rights to use this assessment tool in your clinical trials, research studies, or patient care programs.
Licensing includes: Scale administration rights, scoring guidelines, technical documentation, and ongoing support for proper implementation.
Request Licensing Information
Interested in licensing this scale for your research or clinical practice? Complete the form below and our team will contact you with detailed licensing information, pricing, and implementation support.
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