They also found that physical activity and physical fitness have declined significantly.
Children need physical education at school since they are not getting much at home. Kids need a properly fueled and fit body to do well in school. And yet they take phys ed down to a bare minimum and then wonder why test scores decline.
Do your kids a favor. If the weather permits, go out to the park, or just out in the yard and play with them. It will make them happier and healthier and possibly smarter.