after accounting for student and schoollevel socioeconomic status students who had attended early childhood education for one year or more scored an average of points higher in the pisa science assessment compared to those who had not however there are limits to the interpretation of this finding as the proportion of those who had attended less than one year of early childhood education isced represents on average across oecd countries of only of all yearolds and is relatively low in several oecd countries tables and on the web only for instance before accounting for student and schoollevel socioeconomic status students who had attended early childhood education for three years or more scored an average of points higher in the pisa science assessment compared to those who had attended ecec for less titan one year