Spanking young children is still relatively common, according to a University of Michigan study.

U of M social work professors Shawna Lee and Andrew Grogan-Kaylor conducted the study that found 30 percent of 1 year old children born in urban areas were spanked at least once in a month long period by their mother, father, or both parents.

In the new study, the researchers examined 2,788 families who participated in a multi-year follow up of new births in urban areas.

The study also indicates that spanking by the child's guardians when the child was a year old was linked to child protective services’ involvement between ages one and five.

During that time, 10 percent of the families received at least one visit by child protective services. The study, which appears in the current issue of Child Abuse & Neglect, was also co-authored with Lawrence Berger of the University of Wisconsin.