Sao Paulo Epidemiologic Sleep Study: Rationale, design, sampling, and procedures

To present the rational design, sampling, and procedures utilized in an Epidemiologic Sleep Study carried out in 2007 to establish the epidemiologic profile of sleep disorders in the adult population of a large metropolitan city, Sao Paulo, Brazil.A population-based survey adopting a probabilistic three-stage cluster sample of Sao Paulo was used to represent the population according to gender, age (20-80 years), and socioeconomic class....