Differential item functioning (DIF) analyses of health-related quality of life instruments using logistic regression.
Scott NW, Fayers PM, Aaronson NK, Bottomley A, de Graeff A, Groenvold M, Gundy C, Koller M, Petersen MA, Sprangers MA, et al. Health Qual Life Outcomes. 2010 Aug 4; 8:81. Epub 2010 Aug 4.