Psychometric properties and population norms of the Brief Symptom Inventory-18 (BSI-18) based on a representative German sample
Background The Brief Symptom Inventory-18 (BSI-18) is a widely used self-report measure of psychological distress assessing somatization, depression, and anxiety. Although German population norms were published in 2017 based on data from 2009, updated psychometric evidence using modern statistical methods is lacking. M...