Validity and test-retest reliability of the Swedish version of the Geriatric Depression Scale among very old adults.

Background: The Geriatric Depression Scale (GDS) has shown good validity and reliability, but few studies have examined the GDS among very old adults or the Swedish translation.

Objectives: Evaluate the validity and reliability of the Swedish version of GDS-15 among very old adults.

Methods: In the Umeå85 + /GErontological Regional DAtabase (GERDA) study, 387 participants were assessed with both the GDS-15 and the Montgomery-Åsberg Depression Rating Scale (MADRS).