The purpose of this review was to summarize the most dependable evidence on the effect of parental involvement for improving the academic performance of elementary school age children in grades K-6. This review found that parent involvement had a positive and significant effect on children's overall academic performance. The effect was educationally meaningful and large enough to have practical implications for parents, family involvement practitioners, and policymakers. When parents participated in academic enrichment activities with their children outside of school for an average of less than 12 weeks, children demonstrated an equivalent of 4 to 5 months improvement in reading or math performance.
Nye, C., Turner, H. M. & Schwartz, J. B. (2006). Approaches to Parental Involvement for Improving the Academic Performance of Elementary School Age Children. University of Central Florida Center for Autism and Related Disabilities.