sentence: According to the CDC , the percentage of children aged 6 to 11 years old has increased from 7% to about 18% in 32 years in the United States .
modified: According to the CDC the percentage of children age 6 to 11 years old has increased from 7% to about 18% in 32 years on the Unitated States .
transformation: PUNCT, VERB:FORM, PREP, SPELL