Differential item functioning due to gender and depression.

Abstract

<p>Notes: The dots represent the DIF-Effect, i.e., the item parameter difference between the two groups; error bars indicate the 95% confidence interval; Bullets indicate a significant DIF-Effect for the respective item. Values below 0 means that the item is rather preferred by men, items with DIF-values above 0 are rather preferred by women. The solid line indicates DIF according to sex and the dashed line indicates DIF according to depression. In the latter case, item 2 had to be omitted due to technical reasons (see text). For better readability, the two curves were horizontally displaced.</p