The study found that when parents disciplined their teenagers by yelling, swearing at, or humiliating them two or more times a week, the teens were more likely to act up in school, lie to parents, steal, fight or show signs of depression.
About 1,000 two-parent families were involved in the study.
Researches suggest parents keep their cool, get control of their own emotions and then have a conversation with teenagers about the issue.
