Which of the following statements is true about Tourette's disorder?

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The typical onset of Tourette's syndrome is between 6 and 7 years of age, and Tourette's syndrome is more prevalent in boys than girls.Tourette's syndrome is viewed as a genetic disorder involving repetitive involuntary motor and vocal tics.The tics may occur many times a day and must occur consistently for 1 year or more before the age of 18 for a diagnosis of the syndrome.Related comorbidity occurs with attention-deficit hyperactivity disorder, behavioral problems, specific learning disabilities, or obsessive-compulsive disorder.Although Tourette's syndrome is typically a chronic disorder, some children experience improvement during adolescence and early adulthood.

Which of the Following Statements Is True About Tourette's Disorder