Table 6. Trends in 30-Day Prevalence of Selected Drugs Among 10 th 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 |
8.7
|
8.1
|
10.9
|
15.8
|
17.2
|
20.4
|
20.5
|
18.7
|
19.4
|
19.7
|
19.8
|
17.8
|
-1.9s
|
| Inhalants1 |
2.7
|
2.7
|
3.3
|
3.6
|
3.5
|
3.3
|
3.0 |
2.9
|
2.6
|
2.6
|
2.4
|
2.4
|
-0.1
|
| Hallucinogens |
1.6
|
1.8
|
1.9
|
2.4
|
3.3
|
2.8
|
3.3
|
3.2
|
2.9
|
2.3
|
2.1
|
1.6
|
-0.4
|
| LSD |
1.5
|
1.6
|
1.6
|
2.0
|
3.0
|
2.4
|
2.8
|
2.7
|
2.3
|
1.6
|
1.5
|
0.7
|
-0.8sss
|
| Cocaine |
0.7
|
0.7
|
0.9
|
1.2
|
1.7
|
1.7
|
2.0
|
2.1
|
1.8
|
1.8
|
1.3
|
1.6
|
+0.3
|
| Stimulants |
3.3
|
3.6
|
4.3
|
4.5
|
5.3
|
5.5
|
5.1
|
5.1
|
5.0
|
5.4
|
5.6
|
5.2
|
-0.4
|
| Alcohol (any use)2 |
42.8
|
39.9
|
38.2
|
39.2
|
38.8
|
40.4
|
40.1
|
38.8
|
40.0
|
41.0
|
39.0
|
35.4
|
-3.6ss
|
| Approximate Ns |
14,800
|
14,800
|
15,300
|
15,800
|
17,000
|
15,600
|
15,500
|
15,000
|
13,600
|
14,600
|
14,000
|
14,300
|
|
|
Notes: Level of significance of difference between the two most recent
classes: s=.05. Any inconsistency between the 2000–2001 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). |
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