passages.id: split_4_test_2581_passage
passages.type: progene_text
passages.text: All persons aged 60 years or older who were residents of the rural area of Wadi Ara were examined for identification of DAT , vascular dementia ( VaD ) and conversion from age related cognitive decline ( ARCD ) to DAT using DSM-IV criteria and a semi - structured questionnaire for collection of demographic and medical data .