Inka Wahl

TL;DR: Results from this study support the reliability and validity of thePHQ-4, PHQ-2, and GAD-2 as ultra-brief measures of depression and anxiety in the general population and can be used to compare a subject's scale score with those determined from a general population reference group.

TL;DR: An IRT-based instrument-independent metric for depression severity enables direct comparisons among established measures and simplifies the interpretation of depression assessment by identifying key thresholds for clinical and epidemiologic decision making and facilitates integrative psychometric research across studies, including meta-analysis.

TL;DR: A high rate of previously unrecognized severe symptoms of depression and anxiety in patients with AIH is identified for the first time, suggesting the factors associated with these symptoms may in part be amenable to targeted counselling and adequate treatment of the disease.

TL;DR: Overall, the SSS-8 performed well as a short version of the PHQ-15 which makes it preferable for assessment in time restricted settings and the comparability of severity classifications needs further evaluation in other populations.

TL;DR: Overall, there is little evidence for language DIF between US and German samples, which could be addressed by either replacing the DIF items by items not showing DIF or by scoring the short form in German samples with the corrected item parameters reported.