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Table 1 Sample characteristics. Years 2000-2010

From: The application of observational data in translational medicine: analyzing tobacco-use behaviors of adolescents

Characteristic 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
N 22,418 22,257 15,752 25,299 32,372 41,365 38,748 40,407 38,681 32,461 25,555
Age (mean±SD) 17.1 ± 1.5 17.1 ± 1.4 17.2 ± 1.6 17.1 ± 1.6 17.1 ± 1.6 17.1 ± 1.6 17.1 ± 1.6 17.1 ± 1.6 17.2 ± 1.6 17.1 ± 1.6 17.1 ± 1.4
Gender (male) 47.3% 45.0% 45.5% 45.5% 48.1% 48.1% 48.9% 49.7% 49.0% 49.2% 47.9%
Response rate* 100.0% 87.1% 98.6% 94.9% 96.1% 94.1% 88.9% 92.4% 85.8% 89.2% 86.2%
  1. * Response rate of schools participating in the survey; SD = Standard Deviation.