The HELIAD study has been conducted in Greece the city of in Larissa, Thessaly since 2009, and in Marousi, Athens since 2013. Over a thousand participants of a random sample completed the initial evaluation. The subjects were, on average, 73.4 years old, 60% of the sample were female, and most of the participants were poorly educated with an average of 5.41 years of education. The main previous occupations of the male participants were unskilled laborer, self-employed professional, farmer, and skilled laborer. Approximately half of the female participants described themselves as homemakers, whereas fewer than 20% worked as unskilled laborers and farmers. The majority of the participants were married. The baseline assessment of the cohort began in 2011, and the participants were re-evaluated approximately 3 years after the initial assessment.