Validity and reliability of the Norwegian version of the Ferrans and Powers Quality of Life Index

The purpose of this study was to examine the validity and reliability of th e Norwegian version of the Ferrans and Powers Quality of Life Index in a sa mple of 131 men and women with newly diagnosed cancer. The Quality of Life Index was translated into Norwegian using a standardized international appr oach. including back-translation. The findings showed high internal consist ency reliability for the global score (alpha = 0.93 (test)) as well as for the following domains: health and functioning (alpha = 0.88). socio-economi c (alpha = 0.82), psychological spiritual (alpha = 0.82) and family (alpha = 0.79). The test-retest reliability after 3-4 weeks was 0.78 for the globa l score. A factor analysis partially confirmed the different subscales. In conclusion, the Quality of Life Index was found to be reliable and had suff icient validity to be used for measuring quality of life in Norwegian cance r patients.