Reliability of interview information in a family study in the elderly.

The aim of the present study was to evaluate the combined test-retest and interrater reliability of different psychiatric lifetime diagnoses yielded in the course of a family study in elderly patients and controls. The following interviews and questionnaires were used in combination: the Composite International Diagnostic Interview (CIDI), the Structured Interview for the Diagnosis of Dementia of the Alzheimer Type, Multi-infarct Dementia and Dementias of Other Aetiology (SI-DAM), the General Health Questionnaire (GHQ-12) and questionnaires for neurasthenia and recurrent brief depression (RBD). Depressive and dementia disorders can be diagnosed with good reliability in a family study setting with the use of these instruments. The diagnoses of phobic disorders, neurasthenia, RBD, subthreshold RBD and psychiatric caseness as indicated by GHQ-12 scores were less reliable in this setting and are therefore less suitable for use in family studies.