Culturally sensitive validation of screening questionnaires for depression in older African– Caribbean people living in south London

Abstract

BackgroundWe tested the validity of two screens for depression in older African–Caribbean adults, the 15-item Geriatric Depression Scale (GDS) and a new Caribbean Culture-Specific Screen for emotional distress (CCSS). Two independent criteria were used for validity: (a) a psychiatric diagnosis derived from GMS–AGECAT, and (b) a culturally sensitive assessment of mental disorder, derived from a tool developed with local African–Caribbean religious healers.MethodOne hundred and sixty-four consecutive African–Caribbean primary care users, aged 60 years or older, were screened with the GDS and the CCSS. Diagnostic interviews were carried out on 80% of high scorers and 20% of low scorers.ResultsThe number of cases detected by the two separate diagnostic approaches was similar. However, the agreement between who was and who was not a case was only modest. At a cutoff of $5, the GDS was an adequate case detector for psychiatric depression, and, at a cut-off of $4, for ‘depressed/lost spirit’, as defined by culture-specific criteria. It performed as well as the new CCSS.ConclusionsAt a cut-off of $4 the 15-item GDS can be recommended as a case detector for significant forms of depression in older African–Caribbean people living in south London.