Middle-income kids have 13 books per child, while low-income neighborhoods have 1 book for every 300 children.
In middle-income neighborhoods the ratio of books per child is 13 to 1, in low-income neighborhoods, the ratio is 1 age-appropriate book for every 300 children.
Neuman, Susan B. and David K. Dickinson, ed. Handbook of Early Literacy Research, Volume 2. New York, NY: 2006, p. 31