<p><b>OBJECTIVE:</b> To assess the validity of the geriatric depression scale (GDS) (4-item short form - GDS-4) to screen for depression in elderly primary care patients in Brazil.<br> <b>METHODS:</b> Cross-sectional study among 220 patients aged 60 or over attending 4 primary care clinics in Fortaleza city, Brazil. Those unable to answer the questionnaire because of impairments in communication skills were exc...