Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.
From the 2011 National Health Interview Survey:
For persons age 17 years or under:
Has [PERSON] EVER had chickenpox?
Has [PERSON] had chickenpox DURING THE PAST 12 MONTHS?
Persons are classified as having had chickenpox (varicella) in the past year if they responded “yes” to both questions on chickenpox listed under Numerator.
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