1996 National Household Survey on Drug Abuse:  Preliminary Results

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70617 (205A)              PRELIMINARY DATA - AS OF JUNE 1997 

Table 40.Estimated Number (in Thousands) of Persons Who First Used Cocaine 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

**

*

**

**

**

1963

*

*

0.5

**

0.4

1964

*

*

0.7

0.5

**

1965

*

*

**

0.2

**

1966

*

*

0.7

1.6

1.1

1967

*

*

0.6

0.6

**

1968

59

18.7

0.7

1.5

**

1969

146

17.9

1.9

3.4

0.4

1970

328

18.7

2.7

8.9

**

1971

314

20.2

3.7

5.9

1.2

1972

294

19.0

2.9

7.0

0.1

1973

536

20.5

3.9

12.8

2.0

1974

614

21.3

3.8

15.9

0.5

1975

810

21.2

4.5

18.2

5.4

1976

671

21.0

5.1

13.7

3.6

1977

1079

21.6

4.7

26.1

5.3

1978

1048

21.4

8.2

20.4

4.9

1979

1089

21.6

7.3

21.2

6.3

1980

1292

21.0

8.0

28.6

6.9

1981

1243

21.5

8.9

25.4

7.2

1982

1317

21.6

8.6

27.8

8.4

1983

1154

21.8

8.9

22.5

7.7

1984

1357

22.1

10.8

25.2

11.9

1985

1157

22.5

7.0

22.9

11.5

1986

1268

22.8

10.4

25.9

7.5

1987

1030

22.3

8.8

22.0

6.0

1988

762

21.3

5.5

18.1

4.4

1989

821

22.1

6.2

18.9

5.3

1990

666

22.6

6.1

14.0

4.5

1991

485

21.3

4.6

11.3

2.6

1992

450

20.2

5.8

10.2

2.0

1993

552

20.2

6.4

12.5

2.8

19942

531

20.1

7.9

10.8

1.7

19953

652

19.1

10.6

13.8

1.8

*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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