| Characteristic | 2004 | 2009 |
|---|---|---|
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
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Source
Release date
January 2010
Region
United States
Survey time period
2009
Number of respondents
n = 2002
Age group
8-18 years
Method of interview
Questionnaire
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