Do Cross-Group Differences in Life Satisfaction Reflect Measurement Bias or True Differences in Life Satisfaction? Evidence from a Dutch National Sample.

The purpose of this study was to examine measurement invariance of the Dutch version of the Satisfaction with Life Scale between groups based on gender, age, education, perceived difficulty of the survey, perceived clarity of the survey, and national background. A nationally representative Dutch sample was used (N = 5369). Multiple-groups confirmatory factor analysis was conducted to test measurement invariance. Full metric and scalar invariance were supported for all groups studied. These results indicate that the items of the scale are understood and answered similarly by all groups. Therefore, the 5 items of the Satisfaction with Life Scale measure the same construct in all groups. In other words, the differences in the life satisfaction scores are indicative of actual differences in life satisfaction rather than measurement artifacts and biases. This means that the levels of life satisfaction can be meaningfully compared between groups in The Netherlands.