| Characteristic | 2011 | 2014 |
|---|---|---|
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
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Sources
Release date
February 2015
Region
United States
Survey time period
2011 and 2014
Special properties
children wo used two screens at the same time in a one-month period
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