According to a national survey what percentage of persons aged 8-50 years had severe crowding of the anterior incisors?

Question

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It was found that 9.0% of persons 8-50 years of age had severe crowding of the anterior incisors and 25% had no crowding in a national survey of the latest published findings. Approximately 9.0% of persons had a posterior crossbite; this condition was most common in Whites. Severe overbite was found in 8%, and a similar percentage had a severe overjet. Less than 5% of Whites had an open bite.

According to a National Survey What Percentage of Persons Aged