Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Yearly Trends of the Percentage of Patients Screened Who Tested Positive for Amphetamine
| 2007 (n = 2,927) | 2008 (n = 3,037) | 2009 (n = 3,152) | 2010 (n = 3,351) | 2011 (n = 3,551) | Total (N = 16,018) | |||||||
| n | % | n | % | n | % | n | % | n | % | N | % | |
| Amphetamine + | 385 | 13.2 | 366 | 12.1 | 475 | 15.1 | 510 | 15.2 | 678 | 19.1 | 2414 | 15.1 |
| Amphetamine − | 2542 | 86.8 | 2671 | 87.9 | 2677 | 84.9 | 2841 | 84.8 | 2873 | 80.9 | 13604 | 84.9 |
P < .001 for overall trend.
