1996 National Household Survey on Drug Abuse:  Preliminary Results

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70617 (207A)             PRELIMINARY DATA - AS OF JUNE 1997 

Table 43.Estimated Number (in Thousands) of Persons Who First Used Heroin 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

*

*

**

**

0.2

1963

*

*

0.2

**

**

1964

**

*

**

**

**

1965

*

*

**

0.7

**

1966

*

*

**

0.6

**

1967

*

*

**

0.2

1.1

1968

*

*

0.3

0.2

**

1969

114

16.5

3.0

1.3

0.2

1970

125

19.0

0.6

3.9

**

1971

119

18.7

1.0

3.1

**

1972

126

18.4

0.9

3.3

0.1

1973

75

19.1

1.3

1.3

**

1974

99

23.5

0.3

1.6

1.5

1975

80

19.1

0.4

2.2

**

1976

48

21.1

0.2

0.7

0.6

1977

94

22.3

0.2

1.8

1.0

1978

69

20.9

0.2

1.4

0.4

1979

75

22.0

0.3

1.6

0.4

1980

63

20.7

0.4

1.0

0.2

1981

65

20.4

0.4

1.3

0.3

1982

43

20.2

0.2

0.9

0.2

1983

80

26.0

0.2

1.2

0.1

1984

90

27.4

0.4

0.8

0.8

1985

48

23.3

0.1

1.1

0.3

1986

73

20.2

1.3

1.2

0.2

1987

59

20.4

0.4

1.4

0.2

1988

90

27.3

0.2

1.3

0.3

1989

58

25.0

0.6

0.8

0.4

1990

52

24.3

0.2

0.7

0.7

1991

61

23.3

0.4

0.9

0.6

1992

40

19.6

0.5

0.7

0.2

1993

60

19.5

1.2

0.6

0.4

19942

109

19.7

1.8

1.7

0.6

19953

141

19.3

2.5

2.4

0.5

*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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