1996 National Household Survey on Drug Abuse:  Preliminary Results

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70617 (208A)             PRELIMINARY DATA - AS OF JUNE 1997 

Table 42.Estimated Number (in Thousands) of Persons Who First Used Any Hallucinogen During Each Year 1962-1995, Their Mean Age at First Use, and Annual Age-Specific Rates of First Use (per 1000 Person-Years of Exposure), Based on 1994-1996 NHSDAs




AGE-SPECIFIC RATE OF FIRST USE1

YEAR

INITIATES

(1000s)

MEAN

AGE

12-17

18-25

26-34

1962

*

*

**

**

0.5

1963

*

*

0.3

**

**

1964

*

*

1.4

1.1

**

1965

64

*

0.2

2.7

**

1966

117

17.4

1.1

3.6

**

1967

171

16.3

3.0

3.4

**

1968

390

20.7

2.5

10.0

2.3

1969

623

17.8

11.6

11.4

0.9

1970

854

18.3

11.5

19.1

2.4

1971

853

19.0

11.4

18.2

3.0

1972

618

18.7

8.5

12.2

2.5

1973

683

18.2

12.6

11.7

1.1

1974

579

18.3

9.9

9.9

1.7

1975

813

19.6

8.5

18.9

1.3

1976

830

17.7

14.0

14.8

0.8

1977

654

18.7

10.0

10.9

3.0

1978

749

19.8

12.0

12.0

1.8

1979

771

19.0

10.1

14.7

2.8

1980

683

18.9

10.7

12.1

2.2

1981

640

18.6

9.9

11.9

1.4

1982

662

21.4

7.3

13.6

1.1

1983

610

19.0

9.9

12.2

0.4

1984

502

18.7

10.2

7.3

1.8

1985

510

19.1

8.4

9.8

1.4

1986

630

18.9

10.8

12.3

1.7

1987

639

19.5

9.9

13.1

1.6

1988

628

21.0

9.1

12.6

1.7

1989

645

18.6

12.0

13.7

1.1

1990

641

18.4

12.3

13.8

0.9

1991

569

18.5

10.4

13.1

0.4

1992

630

17.9

13.6

12.6

0.8

1993

772

18.1

15.0

16.0

1.5

19942

1000

18.0

21.9

18.7

2.0

19953

1225

17.7

27.5

24.3

0.7

*Low precision; no estimate reported.

**Estimate rounds to zero.

1The numerator of each rate equals the number of persons who first used the drug in the year (times 1000). The denominator of each rate equals the number of persons who were exposed to risk of first use during the year, weighted by their estimated exposure time measured in years. For example, for the age group 12-17 in 1990, the denominator is the sum of three components:

(1)those persons 12-17 years old in 1990 who first used the drug in 1989 or earlier, times a weight of zero. The weight is zero since they had zero exposure to the risk of first use in 1990.

(2)those who first used the drug in 1990 times a weight of .5. The weight of .5 assumes that these people, on average, first used the drug at midyear and consequently have a half year of exposure (i.e. the first half of the year.)

(3)those who never used, or those who first used the drug in 1991 or later, times a weight of one. The weight of one assumes their exposure to the risk of first use during 1990 was for the whole year.

Each person is also weighted by his/her sample weight.

2Estimated using 1995 and 1996 data only.

3Estimated using 1996 data only.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1994-1996.

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