Risks of harm from spanking confirmed by analysis of 5 decades of research

This matches my experience of babysitting from the ages of 12 to 24, with children whose parents had various parenting styles, and in my own family when I was a child.

http://www.eurekalert.org/pub_releases/2016-04/uota-roh042516.php

Public Release: 25-Apr-2016
Risks of harm from spanking confirmed by analysis of 5 decades of research
University of Texas at Austin

The more children are spanked, the more likely they are to defy their parents and to experience increased anti-social behavior, aggression, mental health problems and cognitive difficulties, according to a new meta-analysis of 50 years of research on spanking by experts at the University of Texas at Austin and the University of Michigan.

The study, published in this month's Journal of Family Psychology, looks at five decades of research involving over 160,000 children. The researchers say it is the most complete analysis to date of the outcomes associated with spanking, and more specific to the effects of spanking alone than previous papers, which included other types of physical punishment in their analyses.

"Our analysis focuses on what most Americans would recognize as spanking and not on potentially abusive behaviors," says Elizabeth Gershoff, an associate professor of human development and family sciences at The University of Texas at Austin. "We found that spanking was associated with unintended detrimental outcomes and was not associated with more immediate or long-term compliance, which are parents' intended outcomes when they discipline their children."

Gershoff and co-author Andrew Grogan-Kaylor, an associate professor at the University of Michigan School of Social Work, found that spanking (defined as an open-handed hit on the behind or extremities) was significantly linked with 13 of the 17 outcomes they examined, all in the direction of detrimental outcomes.

"The upshot of the study is that spanking increases the likelihood of a wide variety of undesired outcomes for children. Spanking thus does the opposite of what parents usually want it to do," Grogan-Kaylor says.

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The researchers looked at a wide range of studies and noted that spanking was associated with negative outcomes consistently and across all types of studies, including those using the strongest methodologies such as longitudinal or experimental designs. As many as 80 percent of parents around the world spank their children, according to a 2014 UNICEF report. Gershoff notes that this persistence of spanking is in spite of the fact that there is no clear evidence of positive effects from spanking and ample evidence that it poses a risk of harm to children's behavior and development.
[The result is widespread violence in society.]

Both spanking and physical abuse were associated with the same detrimental child outcomes in the same direction and nearly the same strength.

"We as a society think of spanking and physical abuse as distinct behaviors," she says. "Yet our research shows that spanking is linked with the same negative child outcomes as abuse, just to a slightly lesser degree."

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