Table 3.

Injection Drug Use, 2009–2015^a

YRBS Year	2009 Prevalence (%) (95% CI)	2011 Prevalence (%) (95% CI)	2013 Prevalence (%) (95% CI)	2015 Prevalence (%) (95% CI)
Total	2.1 (1.9, 2.3)	2.3 (2.0, 2.5)	1.7 (1.5, 1.9)	1.8 (1.6, 2.0)
Boys	2.7 (2.3, 3.0)	2.9 (2.5, 3.3)	2.2 (1.8, 2.5)	2.3 (2.0, 2.7)
Girls	1.4 (1.2, 1.7)	1.6 (1.3, 1.9)	1.3 (1.0, 1.5)	1.0 (0.8, 1.3)
White	1.6 (1.4, 1.9)	1.9 (1.6, 2.2)	1.5 (1.2, 1.8)	1.2 (0.9, 1.4)
Black	2.4 (1.8, 3.0)	2.4 (1.7, 3.1)	1.3 (0.8, 1.8)	2.5 (1.8, 3.2)
Hispanic	3.1 (2.5, 3.7)	2.9 (2.3, 3.5)	2.2 (1.7, 2.8)	2.2 (1.7, 2.7)
Other	2.9 (1.9, 3.9)	3 (2.1, 4.0)	2.3 (1.4, 3.1)	2.3 (1.5, 3.1)
White Boys	2.1 (1.7, 2.5)	2.3 (1.9, 2.8)	2.1 (1.6, 2.5)	1.7 (1.3, 2.1)
White Girls	1.1 (0.7, 1.4)	1.4 (1.0, 1.8)	0.9 (0.6, 1.2)	0.7 (0.4, 0.9)
Black Boys	3.5 (2.4, 4.6)	3.5 (2.3, 4.6)	1.7 (0.9, 2.6)	3.2 (2.1, 4.3)
Black Girls	1.2 (0.6, 1.8)	1.4 (0.6, 2.2)	0.8 (0.3, 1.4)	1.3 (0.6, 2.1)
Hispanic Boys	3.3 (2.4, 4.2)	3.5 (2.5, 4.5)	2.4 (1.6, 3.2)	2.8 (2.0, 3.6)
Hispanic Girls	2.9 (2.0, 3.7)	2.2 (1.4, 3.0)	2 (1.3, 2.8)	1.6 (1.0, 2.2)
Other Boys	4.5 (2.8, 6.2)	4 (2.5, 5.5)	2.7 (1.4, 4.1)	2.5 (0.5, 2.3)
Other Girls	1.1 (0.2, 1.9)	2 (0.9, 3.1)	1.8 (0.7, 2.9)	2.5 (1.4, 3.6)

Note.

^a:Risk behavior prevalence was calculated for the following race/ethnicity and sex subgroups: white, black, Hispanic, and other and further split by boys/girls. The 95% confidence intervals were used to identify significant differences in prevalence at each time point.