Index-Description

The QLI-66 consists of 66 questions covering various areas of an individual’s life. The questions are divided into four main dimensions:

Health and Functioning: Evaluates physical and mental health, level of energy, and ability to perform daily activities.

Socioeconomic Status: Examines economic stability, employment, and access to resources and opportunities.

Social and Family Support: Assesses the quality of personal and social relationships, including family support.

Personal Fulfillment: Focuses on feelings of self-esteem, spirituality, and personal growth.

Participants respond to each question using a Likert scale, allowing them to assess their level of satisfaction in each dimension.

Data Analysis and Usage

The data collected through the QLI-66 are analyzed to provide a comprehensive picture of an individual’s quality of life. The key statistical analyses include:

Reliability analysis, such as the use of Cronbach’s alpha, to measure the internal consistency of questions in each dimension.

Factor analysis to confirm the dimensions that constitute quality of life and to extract the relevant subscales.

Statistical comparisons between different populations (e.g., patients with chronic illnesses versus healthy individuals) to assess the impact of various factors on quality of life.

The data are often used in clinical studies to evaluate the impact of therapeutic interventions, the progression of a disease, or the general well-being of participants.

Purpose

The goal of the QLI-66 is to measure personal satisfaction and quality of life across various domains. The scale aims to help:

Evaluate the overall well-being of individuals.

Identify areas that positively or negatively affect quality of life.

Provide insights for designing interventions that improve quality of life, especially for populations with special needs, such as patients with chronic diseases.

Calibration

The calibration of the QLI-66 includes:

Reliability analysis to estimate the internal consistency of the dimensions of the scale.

Confirmatory factor analysis to validate the dimensions measured by the scale.

Cross-validation in different populations to ensure the reliability and generalizability of the results.

Bibliography

Ferrans, C. E., & Powers, M. J. (1985). Quality of Life Index: Development and psychometric properties. Advances in Nursing Science, 8(1), 15-24.

Skevington, S. M., Lotfy, M., & O’Connell, K. A. (2004). The World Health Organization’s WHOQOL-BREF quality of life assessment: Psychometric properties and results of the international field trial. Quality of Life Research, 13(2), 299-310.

Spitzer, W. O., Dobson, A. J., Hall, J., Chesterman, E., Levi, J., Shepherd, R., … & Battista, R. N. (1981). Measuring the quality of life of cancer patients: A concise QL-index for use by physicians. Journal of Chronic Diseases, 34(12), 585-597.