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Medicina is published by MDPI from Volume 54 Issue 1 (2018). Articles in this Issue were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence. Articles are hosted by MDPI on mdpi.com as a courtesy and upon agreement with Lithuanian Medical Association, Lithuanian University of Health Sciences, and Vilnius University.
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Psychometric properties of the World Health Organization Quality of Life 100 questionnaire in the middle-aged Lithuanian population of Kaunas city

Institute of Cardiology, Kaunas University of Medicine, Lithuania
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Medicina 2009, 45(6), 493; https://doi.org/10.3390/medicina45060065
Received: 12 January 2008 / Accepted: 3 June 2009 / Published: 8 June 2009
This study aimed to identify psychometric properties of the World Health Organization Quality of Life 100 questionnaire.
Material and methods
. A random sample of 1403 Kaunas city men and women aged 35–64 years was examined in 2001–2002. Quality of life was assessed by the self-administered World Health Organization Quality of Life 100 questionnaire.
Statistics. Scores of all domains and facets of the questionnaire were transformed to reflect a scale from 0 to 100. The validity and reliability of the questionnaire were evaluated by Pearson’s correlation coefficients and by Cronbach’s α. The relationship between the WHOQOL-100 domains and the two general items (G1 and G4) was assessed using linear regression analysis. Exploratory factor analysis was conducted to explore the factor structure of the data.
Results
. The mean scores of the World Health Organization Quality of Life 100 questionnaire domains ranged from 51.3±15.1 (overall quality of life) to 72.0±16.4 (level of independence domain). The instrument displayed acceptable Cronbach’s α (0.77–0.91) and test-retest reliability (0.64–0.89). The overall assessment of quality of life (G1) was most strongly associated with the environment (β=0.31), psychological (β=0.18), and social relationships (β=0.17) domains. Overall health (G4) showed the strongest association with the level of independence (β=0.34) and physical (β=0.18) domains. The principal component analysis revealed five-factor solution, which accounted for 57.7% of a total variance.
Conclusion. In the Lithuanian population, the World Health Organization Quality of Life 100 questionnaire was found to be a suitable instrument for evaluating quality of life.
Keywords: quality of life; WHOQOL-100; validity; reliability quality of life; WHOQOL-100; validity; reliability
MDPI and ACS Style

Bacevičienė, M.; Rėklaitienė, R. Psychometric properties of the World Health Organization Quality of Life 100 questionnaire in the middle-aged Lithuanian population of Kaunas city. Medicina 2009, 45, 493.

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