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DRUG USE

Table 5. Trends in 30-Day Prevalence of Selected Drugs Among 8th, 10th, and 12th Graders, Monitoring the Future Study, 19912001 (Percent Prevalence)

Selected drug/grade

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2000-2001
Change

Marijuana/hashish

8th grade

3.2

3.7

5.1

7.8

9.1

11.3

10.2

9.7

9.7

9.1

9.2

+0.1

10th grade

8.7

8.1

10.9

15.8

17.2

20.4

20.5

18.7

19.4

19.7

19.8

0.0

12th grade

13.8

11.9

15.5

19.0

21.2

21.9

23.7

22.8

23.1

21.6

22.4

+0.8

Inhalants1

8th grade

4.4

4.7

5.4

5.6

6.1

5.8

5.6

4.8

5.0

4.5

4.0

-0.5

10th grade

2.7

2.7

3.3

3.6

3.5

3.3

3.0

2.9

2.6

2.6

2.4

-0.1

12th grade2

2.4

2.3

2.5

2.7

3.2

2.5

2.5

2.3

2.0

2.2

1.7

-0.5

Hallucinogens

8th grade

0.8

1.1

1.2

1.3

1.7

1.9

1.8

1.4

1.3

1.2

1.2

0.0

10th grade

1.6

1.8

1.9

2.4

3.3

2.8

3.3

3.2

2.9

2.3

2.1

-0.2

12th grade

2.2

2.1

2.7

3.1

4.4

3.5

3.9

2.8

3.5

3.5

3.2

+0.6

LSD

8th grade

0.6

0.9

1.0

1.1

1.4

1.5

1.5

1.1

1.1

1.0

1.0

0.0

10th grade

1.5

1.6

1.6

2.0

3.0

2.4

2.8

2.7

2.3

1.6

1.5

-0.2

12th grade

1.9

2.0

2.4

2.6

4.0

2.5

3.1

3.2

2.7

1.6

2.3

+0.7s

Cocaine

8th grade

0.5

0.7

0.7

1.0

1.2

1.3

1.1

1.4

1.3

1.2

1.2

-0.1

10th grade

0.7

0.7

0.9

1.2

1.7

1.7

2.0

2.1

1.8

1.8

1.3

-0.4

12th grade

1.4

1.3

1.3

1.5

1.8

2.0

2.3

2.4

2.6

2.1

2.1

-0.1

Stimulants

8th grade

2.6

3.3

3.6

3.6

4.2

4.6

3.8

3.3

3.4

3.4

3.2

-0.3

10th grade

3.3

3.6

4.3

4.5

5.3

5.5

5.1

5.1

5.0

5.4

5.6

+0.2

12th grade

3.2

2.8

3.7

4.0

4.0

4.1

4.8

4.6

4.5

5.0

5.6

+0.2

Alcohol (any use)3

8th grade

25.1

26.1

24.3

25.5

24.6

26.2

24.5

23.0

24.0

22.4

21.5

-0.9

10th grade

42.8

39.9

38.2

39.2

38.8

40.4

40.1

38.8

40.0

41.0

39.0

-2.0

12th grade

54.0

51.3

48.6

50.1

51.3

50.8

52.7

52.0

51.0

50.0

49.8

-0.3

Notes: Level of significance of difference between the two most recent classes: s=.05. Any inconsistency between the 20002001 change estimate and the respective prevalence estimates is due to rounding.

Approximate Ns


1991


1992


1993


1994


1995


1996


1997


1998


1999


2000


2001

8th grade

17,500

18,600

18,300

17,300

17,500

17,800

18,600

18,100

16,700

17,300

16,200

10th grade

14,800

14,800

15,300

15,800

17,000

15,600

15,500

15,000

13,600

14,600

14,000

12th grade

15,000

15,800

16,300

15,400

15,400

14,300

15,400

15,200

13,600

13,300

12,800

1 Unadjusted for underreporting of amyl and butyl nitrites.
2 Data for 12th graders only are based on five of six questionnaire forms; N is five-sixths of N indicated.
3 For all grades: For 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 were based on all forms for all grades.

Source: Institute for Social Research, University of Michigan, Monitoring the Future study (December 2001).











Last Updated: April 22, 2002