The study's explanatory variables were selected considering factors which were intrinsic and extrinsic to the child, which could influence the accomplishment of the PIP.
Las variables explicativas del estudio fueron seleccionadas considerando factores intrínsecos y extrínsecos a lo niño que podrían influenciar en la realización de la PIP.
As variáveis explicativas do estudo foram selecionadas considerando fatores intrínsecos e extrínsecos à criança que poderiam influenciar na realização da PIP.