Description

The Quality of Life Index (QLI-66) is a multidimensional assessment instrument consisting of 66 items that examine different areas of an individual’s life.

The instrument approaches quality of life as a broad construct encompassing health and functioning, socioeconomic circumstances, social and family support, and personal fulfillment.

Participants respond to each item using a Likert-type scale, allowing them to indicate their level of satisfaction across the different dimensions assessed by the instrument.

Objective

The primary objective of the QLI-66 is to measure personal satisfaction and quality of life across different areas of an individual’s life.

According to the available source, the instrument aims to:

  • assess individuals’ overall well-being;
  • identify areas that positively or negatively influence quality of life;
  • provide information that can support the development of interventions designed to improve quality of life, particularly among populations with specific needs, such as individuals living with chronic illnesses.

The instrument can therefore provide both an overall perspective on quality of life and more detailed information regarding the areas that contribute to an individual’s perceived well-being.

Dimensions

The 66 items of the QLI-66 are organized into four main dimensions:

Health and Functioning: Assesses physical and mental health, energy levels, and the individual’s ability to perform everyday activities.

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

Social and Family Support: Evaluates the quality of personal and social relationships, including support provided by family members.

Personal Fulfillment: Focuses on aspects such as self-esteem, spirituality, and personal development.

Together, these dimensions provide a multidimensional representation of the factors that may influence an individual’s overall quality of life.

Scoring

Participants respond to each QLI-66 item using a Likert-type response scale, indicating their level of satisfaction with the different aspects of life assessed by the questionnaire.

Responses can be organized according to the four principal dimensions, allowing different areas of quality of life to be examined separately.

The available source does not specify the exact number of Likert response categories, response anchors, total score range, reverse-scored items, or specific interpretation thresholds. Therefore, detailed scoring should follow the instructions associated with the particular version of the QLI-66 being administered.

Data Analysis and Use

Data collected through the QLI-66 can be analyzed to provide a comprehensive representation of an individual’s quality of life.

According to the source, statistical analysis may include reliability analysis, such as Cronbach’s alpha, to assess the internal consistency of items within each dimension.

Factor analysis may be used to confirm the dimensions underlying quality of life and to identify the corresponding subscales.

Statistical comparisons may also be conducted between different populations, such as individuals with chronic illnesses and healthy individuals, to examine the impact of different factors on quality of life.

QLI-66 data may also be used in clinical studies to evaluate the impact of therapeutic interventions, the course of a disease, or participants’ general well-being.

Psychometric Evaluation

According to the available source, psychometric evaluation of the QLI-66 may include:

Reliability Analysis: Used to assess the internal consistency of the dimensions included in the scale.

Confirmatory Factor Analysis: Used to examine the validity of the dimensions measured by the instrument.

Cross-Validation: Applied across different populations to assess the reliability and generalizability of the results.

These approaches can contribute to evaluating whether the structure and measurement properties of the instrument remain consistent when it is applied to different populations.

Applications

The QLI-66 can be used in clinical and research settings to assess overall quality of life and the individual domains that contribute to it.

In clinical research, the instrument may be used to investigate the impact of therapeutic interventions, disease progression, and general well-being.

It may also support comparisons between different clinical or population groups and help identify specific areas in which interventions aimed at improving quality of life may be required.

Its multidimensional structure enables the simultaneous consideration of health and functioning, socioeconomic circumstances, social and family support, and personal fulfillment.

References

Ferrans CE, Powers MJ. Quality of Life Index: Development and psychometric properties. Advances in Nursing Science. 1985;8(1):15-24.

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

Spitzer WO, Dobson AJ, Hall J, Chesterman E, Levi J, Shepherd R, et al. Measuring the quality of life of cancer patients: A concise QL-index for use by physicians. Journal of Chronic Diseases. 1981;34(12):585-597.