Objective Previous studies have recognized differential item function (DIF) in depressive symptoms measures but the impact of DIF has been rarely reported. Level (GDS) and the Montgomery-?sberg Depressive disorder Rating Level (MADRS). Hybrid logistic regression-item response theory methods were used to examine the presence and impact of DIF due to age sex race/ethnicity and years… Continue reading Objective Previous studies have recognized differential item function (DIF) in depressive