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All authors were involved in the conception of the study, analysis and interpretation of data, and manuscripts writing. All authors have also read and approved the final version of the manuscript.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"CPeNSE 2015 was approved by the National Commission of Research Ethics of the Brazilian Ministry of Health (record no. 1.006.467). The participation was voluntary after giving free and informed consent. The PeNSE 2015 database is publicly available on theInstituto Brasileiro de Geografia e Estat\u00edstica(IBGE) website with no information which could identify subjects or schools,securing anonymity of participants.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical statement"}}]}}