This study tried to control for all the confounding factors, so it looked at children who were equally intelligent and from the same social-class background, so it seemed as if it was the reading which really helped those children go on and score better on those school tests later in their lives.
Cette étude a voulu contrôler tous les facteurs. Elle a considéré des enfants aussi intelligents et ayant la même origine socio-économique. Il semblait que c'était la lecture qui aidaient ces enfants à avoir de meilleurs résultats aux tests scolaires plus tard.