When kindergarten teachers neglect advanced content, children tend to stagnate in reading performance later in elementary school, said study co-author Amy Claessens, assistant professor of public policy at Chicago Harris. Those students also gain less in mathematics than students whose kindergarten experience included more advanced content.

According to Claessens, “basic content” is defined as skills that more than half of the children entering kindergarten have mastered. If the majority of children have not yet grasped it, the content is considered to be advanced.

“There have been many studies of the effects of full-day kindergarten and reduced class size on student learning during kindergarten,” Claessens said. “But we know relatively little about the role of content coverage during the kindergarten years.”

The results indicate that adding four more days per month on advanced topics in reading or mathematics is associated with moderate increases of test score gains.

Claessens believes changing content coverage is a potentially easy and low-cost means to improve student achievement in kindergarten and beyond, especially compared with options such as lengthening the school day or reducing class size.

“At a time when education programs are facing budget constraints, this is a more viable option,” Claessens said. “Teachers could increase their time on advanced content while reducing time on basic content, without the need to increase overall instructional time, and do so in a developmentally appropriate way for young kids.”