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1998 National Household Survey on Drug Abuse

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APPENDIX 2: LIMITATIONS OF THE DATA

IV. Incidence Estimates

 

Year of Initiation

Avg. of Ratio

of 1 Year Recall

to 2-Year Recall

1993

1994

1995

1996

Year of Survey

1994

1995

1995

1996

1996

1997

1997

1998

Rate for Age 12-17

 

    Marijuana

59.2

53.7

74.2

75.2

75.7

73.6

83.2

75.6

1.055

    Cocaine

8.9

5.0

10.2

5.7

10.6

8.0

11.3

11.0

1.480

    Heroin

0.7

0.5

2.1

1.4

2.5

1.8

3.9

1.5

1.722

Rate for Age 18-25

   

    Marijuana

46.9

41.4

42.1

55.9

47.7

53.4

53.6

50.5

0.960

    Cocaine

12.8

12.8

9.9

11.8

13.8

14.7

14.8

13.9

0.961

    Heroin

0.1

1.4

1.4

2.1

2.4

1.9

2.3

3.0

0.692

Number of Initiates

 

    Marijuana

2,035

1,783

2,251

2,548

2,368

2,443

2,540

2,384

1.015

    Cocaine

595

538

533

530

652

654

675

664

1.031

    Heroin

41

62

122

97

141

93

171

127

1.195

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This page was last updated on June 01, 2008.