Abstract

Psychometrics analysis is often used in quality of life outcomes research to evaluate the validity of survey instruments. Many psychometrics assessment instruments have been tested to various cohorts of participants. This paper offers a contribution to validate the instrument of quality of life research that was tested to Malaysian youths. The aim of this paper is to provide an analysis of psychometrics properties of the instrument WHOQOL-BREF, based on the scores of 435 valid questionnaires collected in the study. These psychometrics analyses, which include internal reliability, factor structure, loadings item and inter-domain correlations were tested to the data obtained from 15 to 40 years old of Malaysian youths who completed a 25-item questionnaire on quality of life. The questionnaire was designed to measure four different domains, two of which included physical health and psychological factor. The items fulfilled the internal consistency reliability while the factor analysis extracted approximately 65 percent of the items as the main seven factors. The loading items recognized the domain of Environment as the highest items load followed by the domain of Physical Health. Inter-domain correlations were measured and Spearman’s rho coefficients ranged from 0.554 to 0.613 to prove the connectivity of the four domains. The statistical evidence from Malaysian youth data supports the conclusions of WHOQOL-BREF as a suitable psychometrics tool for measuring quality of life.

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