Problem: All of the following about nail biting are true except: Need Assignment Help? Group of answer choices Two-thirds of youths that nail bite have a comorbid psychiatric condition. 65% of nail biters also bite their lips or bang their heads. Anxiety disorders are present equally in those who do bite their nails and in those who do not bite their nails. 60% of those who bite their nails also have obsessive-compulsive disorder (OCD).