Fourth grade students who reported that they have more than 100 books at home scored 43 points higher in PIRLS …

„Fourth grade students who reported that they have more than 100 books at home scored 43 points higher in PIRLS than their peers who reported having fewer than 100 books at home.“

EU-Kommission (Hrsg.), „EU High Level Group of Experts on Literacy. Final Report“ (2012), S. 64

Dies entspricht einem Leistungsvorsprung von etwa eineinhalb Jahren.