A relação de fatores individuais, familiares e escolares com a distorção idade-série no ensino público brasileiroThe relationship between individual, family and scholar characteristics and the age-grade distorcion in Brazilian public education Alysson Lorenzon Portella Códigos JEL A21; C51; I21. AbstractThis work discusses factors related to the age-grade gap, indicating the main determinants of it for Brazilian public-school students. Using data from PNAD and INEP from the year of 2013, it is evaluated how personal, family and school characteristics are related to the occurrence of age grade-distortion on public school students. More specifically, this work applies econometric models that deal exclusively with count data, such as Poisson and Negative Binomial, as well as models adjusted for excess zeros, such as Zero-Infl ated Poisson and Zero-Infl ated Negative Binomial. Among the results, it is highlighted a substitutability between the variables related to the educational and the individual-family context, with a reduction of the individual-family coeffi cients once educational variables are considered in the estimation. Furthermore, it is found that as students grow older, the absence of any previous age-grade gap is refl ected in a smaller probability of it ever happening in the future.