Although the 2008 study was conducted on a representative primary-school sample, our data on subsidised and private schools are directly comparable because they all the schools involved impart two educational cycles.
Aunque el estudio de 2008 se realizó sobre una muestra representativa de colegios de primaria, nuestros datos sobre centros concertados y privados son directamente comparables porque todos ellos imparten los dos ciclos de enseñanza.