title: The authors reply.
authors.affiliation: Pediatric Critical Care Unit, Instituto da Criança Hospital das Clinicas da Faculdade de Medicina da Universidade de Sao Paulo, Sao Paulo, Brazil.
authors.forename: Graziela
authors.initials: G
authors.lastname: de Araujo Costa Zanatta
authors.forename: Artur Figueiredo
authors.initials: AF
authors.lastname: Delgado
mesh_terms: D005260:Female; D017052:Hospital Mortality; D006801:Humans; D015278:Intensive Care Units, Pediatric; D008297:Male; D012720:Severity of Illness Index