Questionnaire-Description

The QoL-RI-55 is a 55-item questionnaire designed to measure the impact of respiratory diseases on patients’ quality of life. It examines aspects related to both the physical and psychosocial well-being of individuals with respiratory disorders. The scale covers various dimensions, such as:

Physical health: Evaluates symptoms like shortness of breath, fatigue, and limitations in physical activities.

Emotional state: Measures emotional impacts, including anxiety, depression, and fear associated with respiratory illness.

Social functioning: Assesses the effect of the disease on social activities and interpersonal relationships.

Daily life: Examines how the illness affects daily activities and the individual’s independence.

The questionnaire uses a Likert scale to score responses, allowing the quantification of the impact of symptoms on quality of life.

Data Analysis and Usage

The data from the QoL-RI-55 are used to determine the extent to which respiratory diseases affect various aspects of patients’ lives. The data analysis includes:

Reliability analysis, such as calculating Cronbach’s alpha, to assess the internal consistency of the items in each subscale.

Factor analysis to identify the key dimensions of quality of life that are affected by respiratory diseases.

Statistical analyses, such as regression and correlation analysis, to explore the relationships between quality of life and other factors like disease severity, symptom frequency, and treatment effectiveness.

These data are valuable in clinical studies, helping evaluate the effectiveness of interventions for respiratory health and informing care programs that focus on improving patients’ quality of life.

Purpose

The main goal of the QoL-RI-55 is to measure the impact of respiratory diseases on patients’ quality of life, taking into account the physical, emotional, and social dimensions of well-being. The tool aims to:

Help clinicians and researchers better understand the experiences of patients with respiratory disorders.

Be used to evaluate therapeutic interventions and disease management.

Contribute to improving the quality of care and personalized treatment for patients.

Calibration

The calibration of the QoL-RI-55 involves the following steps:

Reliability analysis to measure the internal consistency and stability of responses across different subscales.

Confirmatory factor analysis to validate the structure and dimensions used to assess the various aspects of quality of life.

Cross-validation with different patient populations, such as those with asthma, chronic obstructive pulmonary disease (COPD), and pulmonary fibrosis, to ensure that the tool is reliable and applicable across various clinical settings.

Bibliography

Jones, P. W., Quirk, F. H., Baveystock, C. M., & Littlejohns, P. (1992). A self-complete measure of health status for chronic airflow limitation: The St George’s Respiratory Questionnaire. American Review of Respiratory Disease, 145(6), 1321-1327.

Guyatt, G. H., Berman, L. B., Townsend, M., Pugsley, S. O., & Chambers, L. W. (1987). A measure of quality of life for clinical trials in chronic lung disease. Thorax, 42(10), 773-778.

McSweeny, A. J., Grant, I., Heaton, R. K., Adams, K. M., & Timms, R. M. (1982). Life quality of patients with chronic obstructive pulmonary disease. Archives of Internal Medicine, 142(3), 473-478.