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Differential item and test functioning methodology indicated that item response bias was not a substantial cause of country differences in mental well-being.
Forero CG, Adroher ND, Stewart-Brown S, Castellví P, Codony M, Vilagut G, Mompart A, Tresseres R, Colom J, Castro JI, Alonso J. Forero CG, et al. Among authors: tresseres r. J Clin Epidemiol. 2014 Dec;67(12):1364-74. doi: 10.1016/j.jclinepi.2014.06.017. Epub 2014 Aug 21. J Clin Epidemiol. 2014. PMID: 25150627