2. Occurrence

Most people do not begin to bite their nails until they are three or four years old. Though there are some contradictory reports on the topic, the consensus is that while numerous children and adolescents bite their nails, the condition wanes in adulthood. Some studies suggest the prevalence of nail-biting in children between the ages of seven and ten is around 20 to 33 percent. In adolescents, the prevalence percentage increase to around 45 percent.

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