| Characteristic | Penetration rate |
|---|---|
| - | - |
| - | - |
| - | - |
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Source
Release date
September 2015
Region
United States
Survey time period
2011, 2013 and 2015*
Number of respondents
2011: n = 4,136; 2013:n = 4,209; 2015: n = 3,279
Age group
2-17 years
Method of interview
Online survey
Supplementary notes
* The source does not provide more exact survey dates.
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