Table 232.40.

Percentage of students in grades 9–12 who reported using marijuana at least one time during the previous 30 days, by location and selected student characteristics: Selected years, 1993 through 2011

[Standard errors appear in parentheses]
Location and student characteristic	1993		1995			1997			1999		2001			2003			2005			2007			2009			2011
1	2		3			4			5		6			7			8			9			10			11
Anywhere (including    on school property)1
Total	17.7	(1.22)	25.3		(1.03)	26.2		(1.11)	26.7	(1.30)	23.9		(0.77)	22.4		(1.09)	20.2		(0.84)	19.7		(0.97)	20.8		(0.70)	23.1		(0.80)
Sex
Male	20.6	(1.61)	28.4		(1.08)	30.2		(1.46)	30.8	(1.92)	27.9		(0.81)	25.1		(1.25)	22.1		(0.98)	22.4		(1.02)	23.4		(0.80)	25.9		(1.01)
Female	14.6	(1.02)	22.0		(1.44)	21.4		(1.04)	22.6	(0.96)	20.0		(0.87)	19.3		(0.96)	18.2		(0.99)	17.0		(1.13)	17.9		(0.87)	20.1		(0.95)
Race/ethnicity2
White	17.3	(1.41)	24.5		(1.49)	25.0		(1.56)	26.4	(1.59)	24.4		(1.04)	21.7		(1.20)	20.3		(1.11)	19.9		(1.28)	20.7		(0.93)	21.7		(1.09)
Black	18.6	(1.84)	28.6		(2.62)	28.2		(1.67)	26.4	(3.49)	21.8		(2.12)	23.9		(1.58)	20.4		(1.11)	21.5		(1.64)	22.2		(1.44)	25.1		(1.35)
Hispanic	19.4	(1.33)	27.8		(2.92)	28.6		(2.06)	28.2	(2.29)	24.6		(0.81)	23.8		(1.16)	23.0		(1.22)	18.5		(1.41)	21.6		(1.04)	24.4		(1.27)
Asian3	—	(†)	—		(†)	—		(†)	13.5	(2.04)	10.9		(2.12)	9.5		(2.21)	6.7		(1.64)	9.4		(1.63)	7.5		(1.40)	13.6		(3.75)
Pacific Islander3	—	(†)	—		(†)	—		(†)	33.8	(4.11)	21.9		(4.07)	28.1		(6.47)	12.4	!	(3.87)	28.7		(6.14)	24.8		(5.50)	31.1		(7.08)
American Indian/Alaska Native	17.4	(4.77)	28.0		(5.72)	44.2		(4.31)	36.2	(6.55)	36.4		(5.48)	32.8		(5.29)	30.3		(4.36)	27.4		(3.50)	31.6		(5.26)	47.4		(3.20)
Two or more races3	—	(†)	—		(†)	—		(†)	29.1	(4.00)	31.8		(3.22)	28.3		(5.57)	16.9		(2.43)	20.5		(2.73)	21.7		(2.33)	26.8		(2.10)
Grade
9th	13.2	(1.10)	20.9		(1.83)	23.6		(1.95)	21.7	(1.84)	19.4		(1.25)	18.5		(1.52)	17.4		(1.16)	14.7		(1.02)	15.5		(0.97)	18.0		(1.11)
10th	16.5	(1.79)	25.5		(1.89)	25.0		(1.29)	27.8	(2.21)	24.8		(1.12)	22.0		(1.47)	20.2		(1.27)	19.3		(1.12)	21.1		(1.11)	21.6		(1.15)
11th	18.4	(1.77)	27.6		(1.35)	29.3		(1.81)	26.7	(2.47)	25.8		(1.33)	24.1		(1.56)	21.0		(1.24)	21.4		(1.49)	23.2		(1.52)	25.5		(1.44)
12th	22.0	(1.40)	26.2		(2.35)	26.6		(2.09)	31.5	(2.81)	26.9		(1.77)	25.8		(1.19)	22.8		(1.23)	25.1		(1.96)	24.6		(1.49)	28.0		(1.08)
Urbanicity4
Urban	—	(†)	—		(†)	26.8		(1.50)	27.5	(2.32)	25.6		(1.23)	23.4		(1.65)	—		(†)	—		(†)	—		(†)	—		(†)
Suburban	—	(†)	—		(†)	27.0		(1.05)	26.1	(1.60)	22.5		(0.96)	22.8		(1.90)	—		(†)	—		(†)	—		(†)	—		(†)
Rural	—	(†)	—		(†)	21.9		(3.23)	28.0	(4.36)	26.2		(2.49)	19.9		(2.80)	—		(†)	—		(†)	—		(†)	—		(†)
On school property5
Total	5.6	(0.65)	8.8		(0.59)	7.0		(0.52)	7.2	(0.73)	5.4		(0.37)	5.8		(0.68)	4.5		(0.32)	4.5		(0.46)	4.6		(0.35)	5.9		(0.39)
Sex
Male	7.8	(0.83)	11.9		(0.85)	9.0		(0.68)	10.1	(1.30)	8.0		(0.54)	7.6		(0.88)	6.0		(0.44)	5.9		(0.61)	6.3		(0.54)	7.5		(0.56)
Female	3.3	(0.48)	5.5		(0.72)	4.6		(0.56)	4.4	(0.40)	2.9		(0.28)	3.7		(0.48)	3.0		(0.31)	3.0		(0.39)	2.8		(0.32)	4.1		(0.32)
Race/ethnicity2
White	5.0	(0.72)	7.1		(0.62)	5.8		(0.69)	6.5	(0.84)	4.8		(0.45)	4.5		(0.66)	3.8		(0.41)	4.0		(0.63)	3.8		(0.38)	4.5		(0.42)
Black	7.3	(1.23)	12.3		(1.88)	9.1		(1.07)	7.2	(1.10)	6.1		(0.60)	6.6		(0.89)	4.9		(0.65)	5.0		(0.73)	5.6		(0.64)	6.7		(0.77)
Hispanic	7.5	(1.10)	12.9		(2.20)	10.4		(1.03)	10.7	(1.21)	7.4		(0.58)	8.2		(0.72)	7.7		(0.76)	5.4		(0.80)	6.5		(0.76)	7.7		(0.54)
Asian3	—	(†)	—		(†)	—		(†)	4.3	(0.71)	4.7	!	(1.56)	4.3	!	(1.38)	‡		(†)	2.7	!	(1.06)	2.0		(0.54)	4.5		(1.34)
Pacific Islander3	—	(†)	—		(†)	—		(†)	11.0	(3.21)	6.4	!	(2.46)	9.1	!	(3.17)	‡		(†)	13.4	!	(5.38)	9.0		(2.40)	12.5	!	(4.94)
American Indian/Alaska Native	‡	(†)	10.1	!	(3.39)	16.2	!	(5.56)	‡	(†)	21.5	!	(6.55)	11.4	!	(4.42)	9.2		(1.85)	8.2		(2.30)	2.9	!	(1.25)	20.9		(4.05)
Two or more races3	—	(†)	—		(†)	—		(†)	7.8	(1.81)	5.2		(1.24)	11.4	!	(5.49)	3.6		(0.91)	3.6	!	(1.08)	5.4		(1.34)	8.1		(1.79)
Grade
9th	4.4	(0.40)	8.7		(1.38)	8.1		(0.90)	6.6	(0.97)	5.5		(0.62)	6.6		(1.03)	5.0		(0.59)	4.0		(0.52)	4.3		(0.38)	5.4		(0.65)
10th	6.5	(0.94)	9.8		(0.87)	6.4		(0.73)	7.6	(1.14)	5.8		(0.51)	5.2		(0.70)	4.6		(0.54)	4.8		(0.60)	4.6		(0.50)	6.2		(0.63)
11th	6.5	(1.07)	8.6		(0.62)	7.9		(1.17)	7.0	(0.72)	5.1		(0.48)	5.6		(0.71)	4.1		(0.49)	4.1		(0.73)	5.0		(0.55)	6.2		(0.70)
12th	5.1	(0.78)	8.0		(1.15)	5.7		(0.61)	7.3	(1.14)	4.9		(0.71)	5.0		(0.75)	4.1		(0.45)	5.1		(0.73)	4.6		(0.49)	5.4		(0.39)
Urbanicity4
Urban	—	(†)	—		(†)	8.0		(1.11)	8.5	(1.03)	6.8		(0.56)	6.8		(1.05)	—		(†)	—		(†)	—		(†)	—		(†)
Suburban	—	(†)	—		(†)	7.0		(0.67)	6.4	(1.03)	4.7		(0.46)	6.0		(1.03)	—		(†)	—		(†)	—		(†)	—		(†)
Rural	—	(†)	—		(†)	4.9	!	(2.02)	8.1	(1.57)	5.3		(0.93)	3.9		(0.64)	—		(†)	—		(†)	—		(†)	—		(†)

—Not available.

†Not applicable.

!Interpret data with caution. The coefficient of variation (CV) for this estimate is between 30 and 50 percent.

‡Reporting standards not met. The coefficient of variation (CV) for this estimate is 50 percent or greater.

1 The term "anywhere" is not used in the Youth Risk Behavior Survey (YRBS) questionnaire; students were simply asked how many times during the previous 30 days they had used marijuana.

2 Race categories exclude persons of Hispanic ethnicity.

3 Before 1999, Asian students and Pacific Islander students were not categorized separately, and students were not given the option of choosing two or more races. Because the response categories changed in 1999, caution should be used in comparing data on race from 1993, 1995, and 1997 with data from later years.

4 Refers to the Standard Metropolitan Statistical Area (MSA) status of the respondent's household as defined in 2000 by the U.S. Census Bureau. Categories include "central city of an MSA (Urban)," "in MSA but not in central city (Suburban)," and "not MSA (Rural)."

5 In the question about using marijuana at school, "on school property" was not defined for survey respondents.

SOURCE: Centers for Disease Control and Prevention, Division of Adolescent and School Health, Youth Risk Behavior Surveillance System (YRBSS), 1993 through 2011. (This table was prepared September 2013.)