1996 National Household Survey on Drug Abuse:  Preliminary Results

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70617 (126B)PRELIMINARY DATA - AS OF JUNE 1997, ADJUSTED 1979-1993 ESTIMATES

Table 19B.Percentages Reporting Marijuana, Cocaine, and Alcohol Use in the U.S. Population Aged 12 and Older, by Past Year Frequency of Use: 1985-1996

Drug/Frequency of

Use in Past Year

1979

1982

1985

1988

1990

1991

1992

1993

1994

1995

1996













MARIJUANA
























Fewer than 12 days1

--

--

6.7b

4.8

5.1a

4.7

4.0

4.3

4.4

4.1

4.0

12 or more days1,2

--

--

7.3b

5.3

4.5

4.2

4.0

4.1

4.1

4.3

4.6

51 or more days1

--

--

4.4b

3.2

2.6

2.4

2.4

2.3

2.5

2.5

2.8













COCAINE
























Fewer than 12 days1

--

--

3.7b

2.6b

1.8a

1.9a

1.5

1.3

1.2

1.2

1.2

12 or more days1,2

--

--

1.4b

1.0

0.9

0.7

0.6

0.6

0.6

0.6

0.7

51 or more days1

--

--

0.4

0.6

0.4

0.4

0.4

0.3

0.4

0.3

0.3













ALCOHOL
























Fewer than 12 days1

--

--

24.9

23.7

26.5

26.7

27.1

26.6

26.3

25.5

25.6

12 or more days1,2

--

--

48.4b

44.7a

39.8

41.6

37.8

40.2

40.6

39.9

39.3

51 or more days1

--

--

27.7b

23.8

20.7

21.1

20.2

21.4

21.8

23.0

21.8

*Low precision; no estimate reported.

-- Not available.

NOTE:The population distributions for the 1993 through 1996 NHSDAs are post-stratified to population projections of totals based on the 1990 decennial census. The 1979 NHSDA used population projections based on the 1970 census; NHSDAs from 1982 through 1992 used projections based on the 1980 census. The change from one census base to another has little effect on estimated percentages reporting drug use, but may have a significant effect on estimates of number of drug users in some subpopulation groups.

NOTE:Estimates for 1979 through 1993 may differ from estimates for these survey years that were published in other NHSDA reports. The estimates shown here for 1979 through 1993 have been adjusted to improve their comparability with estimates based on the new version of the NHSDA instrument that was fielded in 1994 and subsequent NHSDAs. For 1979 and 1982, estimates are not shown (as indicated by --) where (a) the relevant data were not collected, or (b) the data for those drugs were based on measures that differed appreciably from those used in the other survey years. Consequently, adjustments to the 1979 and 1982 data were made only for those drugs whose measures were comparable to those in the other survey years.

Because of the methodology used to adjust the 1979 through 1993 estimates, some logical inconsistency may exist between estimates for a given drug within the same survey year. For example, the number of past year users of a drug shown here from the frequency of use in the past year question may differ from the estimated number of past year users based on the recency of use question. These inconsistencies tend to be small, rare and not statistically significant.

1For 1993 and earlier, "occasional" use is equivalent to use in the past year but on "fewer than 12 days" in this table. Also for 1993 and earlier, "monthly" use is equivalent to use on "12 or more days" in the past year in this table and "weekly" use is equivalent to use on "51 or more days" in the past year in this table.

2The category "12 or more days" includes "51 or more days"; the sum of "fewer than 12 days" and "12 or more days" is equivalent to all past year users.

aDifference between estimate and 1996 estimate is statistically significant at the .05 level.

bDifference between estimate and 1996 estimate is statistically significant at the .01 level.

Source: SAMHSA, Office Of Applied Studies, National Household Survey on Drug Abuse.

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