|
|
National Drug Control Strategy
Update 2003
February 2003
Table 5. Trends in 30-Day Prevalence of Selected Drugs Among 8th Graders, Monitoring the Future Study, 1991–2002 (Percent Prevalence)
|
Selected
drug
|
1991
|
1992
|
1993
|
1994
|
1995
|
1996
|
1997
|
1998
|
1999
|
2000
|
2001
|
2002
|
2001-2002
Change
|
|
Marijuana/hashish
|
3.2
|
3.7
|
5.1
|
7.8
|
9.1
|
11.3
|
10.2
|
9.7
|
9.7
|
9.1
|
9.2
|
8.3
|
-0.9
|
|
|
4.4
|
4.7
|
5.4
|
5.6
|
6.1
|
5.8
|
5.6
|
4.8
|
5.0
|
4.5
|
4.0
|
3.8
|
-0.2
|
|
Hallucinogens
|
0.8
|
1.1
|
1.2
|
1.3
|
1.7
|
1.9
|
1.8
|
1.4
|
1.3
|
1.2
|
1.6
|
1.2
|
-0.4
|
|
LSD
|
0.6
|
0.9
|
1.0
|
1.1
|
1.4
|
1.5
|
1.5
|
1.1
|
1.1
|
1.0
|
1.0
|
0.7
|
-0.3
|
|
Cocaine
|
0.5
|
0.7
|
0.7
|
1.0
|
1.2
|
1.3
|
1.1
|
1.4
|
1.3
|
1.2
|
1.2
|
1.1
|
-0.1
|
|
Stimulants
|
2.6
|
3.3
|
3.6
|
3.6
|
4.2
|
4.6
|
3.8
|
3.3
|
3.4
|
3.4
|
3.2
|
2.8
|
-0.4
|
|
|
25.1
|
26.1
|
24.3
|
25.5
|
24.6
|
26.2
|
24.5
|
23.0
|
24.0
|
22.4
|
21.5
|
19.6
|
-1.9s
|
|
Approximate Ns
|
17,500
|
18,600
|
18,300
|
17,300
|
17,500
|
17,800
|
18,600
|
18,100
|
16,700
|
17,300
|
16,200
|
15,100
|
|
Notes: Level of significance of difference between the two most recent
classes: s=.05. Any inconsistency between the 2001–2002 change estimate
and the respective prevalence estimates is due to rounding.
1Unadjusted
for underreporting of amyl and butyl nitrites.
2For
1993, the question text was changed slightly in one-half of the forms
to indicate that a “drink” meant “more than a few sips.”
For 1993, N is one-half of N indicated for all groups. Data after 1993
is based on all forms.
Source: Institute for Social Research, University of Michigan, Monitoring
the Future study (December 2002). |
Last Updated: May 7, 2003
|
