Data from North Carolina's mandated End-of-Grade tests (2000-2005), which includes student reports on how frequently they use a home computer for schoolwork, watch TV or read for pleasure, reveals that students in grades five through eight (c.10-13), particularly those from disadvantaged families, tended to have lower reading and math scores after they got a home computer. The researchers suggest that the greater negative effect in disadvantaged households may reflect less parental monitoring.
Children with home computers likely to have lower test scores
 Scaling the Digital Divide: Home Computer Technology and Student Achievement. National Bureau of Economic Research Working Paper Series. No. 16078,(2010).