Appendix H - Selected Prevalence Tables - Initiation of Substance Use Tables - Tables H.42 to H.55

2001 National Household Survey on Drug Abuse

Initiation of Substance Use Tables - Tables H.42 to H.55

20624 (4.1A)
Table H.42 Estimated Numbers (in Thousands) of Persons Who First Used Marijuana During the Years 1965 to 2000, Their Mean Age at First Use, and Annual Age-Specific Rates of First Use (Per 1,000 Person-Years of Exposure): Based on 1999-2001 NHSDAs

NUMBER OF INITIATES (1,000s)

MEAN AGE

AGE-SPECIFIC RATES¹

YEAR

All Ages

12-17

18-25

12-17

18-25

1965

585

194

308

19.7

8.5

14.2

1966

944

308

555

19.2

13.5

24.1

1967

1,358

483

792

19.2

21.0

33.5

1968

1,850

560

1,145

19.3

24.0

47.9

1969

2,290

854

1,245

18.9

36.3

52.8

1970

2,477

1,075

1,133

18.6

45.5

48.6

1971

2,807

1,150

1,329

18.7

48.7

57.9

1972

2,746

1,316

1,146

18.7

55.9

51.1

1973

3,006

1,521

1,108

18.4

64.9

51.7

1974

2,949

1,557

1,036

18.1

67.5

50.2

1975

2,847

1,538

965

18.4

67.1

47.9

1976

3,208

1,689

1,156

18.5

74.6

58.8

1977

3,135

1,812

1,014

17.9

82.1

52.9

1978

2,972

1,688

932

18.2

79.3

49.7

1979

2,850

1,659

859

18.4

80.8

46.4

1980

2,639

1,471

796

19.1

74.0

43.6

1981

1,996

1,084

633

18.5

55.1

35.0

1982

2,080

1,150

670

18.6

58.5

37.4

1983

1,885

1,093

569

18.1

55.4

31.9

1984

2,024

1,178

619

18.2

60.4

34.9

1985

1,860

1,103

610

17.8

57.3

34.6

1986

1,824

1,057

619

18.0

56.2

35.2

1987

1,599

929

553

18.0

50.3

31.6

1988

1,589

915

570

17.7

50.6

32.4

1989

1,458

822

520

17.5

46.0

29.3

1990

1,448

789

508

18.4

43.7

28.9

1991

1,483

788

551

18.0

43.0

31.4

1992

1,648

957

590

16.9

51.0

33.8

1993

1,924

1,160

598

17.1

60.5

34.5

1994

2,220

1,390

692

16.9

71.7

40.5

1995

2,439

1,539

766

16.6

79.4

46.0

1996

2,531

1,622

734

17.0

84.3

45.3

1997

2,469

1,628

704

16.9

84.8

44.8

1998

2,512

1,613

725

17.4

84.0

47.4

1999²

2,322

1,577

602

16.9

82.0

39.5

2000³

2,440

1,622

621

17.5

84.0

42.5

*Low precision; no estimate reported.
-- Not available.
¹ The numerator of each rate is the number of persons in the age group who first used the drug in the year, while the denominator is the person time exposure measured in thousands of years.
² Estimated using 2000 and 2001 data only.
³ Estimated using 2001 data only.
Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999-2001.

20624 (4.2A)
Table H.43 Estimated Numbers (in Thousands) of Persons Who First Used Cocaine During the Years 1965 to 2000, Their Mean Age at First Use, and Annual Age-Specific Rates of First Use (Per 1,000 Person-Years of Exposure): Based on 1999-2001 NHSDAs


	NUMBER OF INITIATES (1,000s)			MEAN AGE	AGE-SPECIFIC RATES¹
YEAR	All Ages	12-17	18-25	MEAN AGE	12-17	18-25
1965	18	*	*	*	*	*
1966	37	*	24	21.0	*	1.0
1967	81	29	49	17.2	1.2	1.9
1968	173	28	120	20.4	1.1	4.5
1969	216	37	154	19.5	1.5	5.6
1970	258	34	189	21.0	1.3	6.6
1971	358	90	233	20.8	3.5	7.9
1972	457	93	337	19.7	3.6	11.2
1973	401	123	260	19.6	4.7	8.6
1974	582	119	386	21.4	4.5	12.8
1975	776	171	497	21.4	6.4	16.3
1976	817	176	512	21.0	6.7	16.6
1977	988	239	600	20.9	9.2	19.4
1978	1,054	243	635	21.3	9.6	20.5
1979	1,196	222	731	21.6	9.0	23.5
1980	1,280	284	733	21.7	11.9	23.5
1981	1,185	204	762	21.8	8.8	24.5
1982	1,213	198	747	22.5	8.7	24.3
1983	1,484	236	892	22.6	10.5	29.6
1984	1,226	228	745	22.1	10.3	25.3
1985	1,222	231	733	22.1	10.5	25.6
1986	1,042	230	576	22.8	10.7	20.5
1987	1,053	211	610	22.4	10.1	22.2
1988	837	162	508	22.2	8.0	18.6
1989	722	157	376	22.9	7.9	13.9
1990	703	111	384	22.9	5.6	14.4
1991	561	90	299	23.8	4.5	11.4
1992	539	109	289	22.9	5.3	11.1
1993	571	132	312	22.4	6.1	12.1
1994	583	157	288	22.3	7.1	11.3
1995	648	194	348	21.1	8.6	13.7
1996	693	241	358	20.6	10.5	14.3
1997	785	270	433	19.8	11.6	17.5
1998	841	308	439	20.1	13.2	17.7
1999²	851	289	462	20.1	12.3	18.5
2000³	926	314	503	20.0	13.3	20.1

20624 (4.4A)
Table H.44 Estimated Numbers (in Thousands) of Persons Who First Used Heroin During the Years 1965 to 2000, Their Mean Age at First Use, and Annual Age-Specific Rates of First Use (Per 1,000 Person-Years of Exposure): Based on 1999-2001 NHSDAs


	NUMBER OF INITIATES (1,000s)			MEAN AGE	AGE-SPECIFIC RATES¹
YEAR	All Ages	12-17	18-25	MEAN AGE	12-17	18-25
1965	*	*	*	*	*	*
1966	24	*	*	14.8	*	*
1967	49	42	7	16.1	1.8	0.3
1968	48	*	*	16.9	*	*
1969	84	16	65	19.3	0.7	2.3
1970	98	45	49	18.4	1.8	1.7
1971	102	22	80	19.3	0.8	2.7
1972	78	19	51	20.0	0.7	1.6
1973	97	20	64	20.7	0.8	2.1
1974	99	*	78	20.7	*	2.5
1975	128	*	102	22.4	*	3.2
1976	120	33	61	20.9	1.2	1.9
1977	136	*	105	23.0	*	3.2
1978	63	*	38	21.0	*	1.1
1979	112	*	68	24.0	*	2.0
1980	49	*	11	26.6	*	0.3
1981	57	*	34	22.8	*	1.0
1982	85	14	37	26.5	0.6	1.0
1983	33	7	14	23.4	0.3	0.4
1984	53	12	25	22.4	0.5	0.7
1985	87	*	24	28.7	*	0.7
1986	63	*	42	23.7	*	1.3
1987	49	*	23	22.9	*	0.7
1988	65	10	40	21.6	0.5	1.3
1989	55	6	19	24.0	0.3	0.6
1990	61	5	32	24.7	0.3	1.1
1991	63	10	27	22.9	0.5	0.9
1992	69	16	29	23.4	0.8	1.0
1993	77	12	36	24.7	0.6	1.3
1994	110	28	34	24.3	1.3	1.2
1995	89	26	49	20.3	1.1	1.8
1996	116	38	59	20.7	1.6	2.1
1997	146	36	55	23.4	1.5	2.0
1998	135	42	52	22.4	1.8	1.9
1999²	136	32	56	24.5	1.4	2.0
2000³	146	40	61	22.3	1.7	2.2

20624 (4.5A)
Table H.45 Estimated Numbers (in Thousands) of Persons Who First Used Hallucinogens During the Years 1965 to 2000, Their Mean Age at First Use, and Annual Age-Specific Rates of First Use (Per 1,000 Person-Years of Exposure): Based on 1999-2001 NHSDAs


	NUMBER OF INITIATES (1,000s)			MEAN AGE	AGE-SPECIFIC RATES¹
YEAR	All Ages	12-17	18-25	MEAN AGE	12-17	18-25
1965	90	33	49	19.0	1.4	2.2
1966	101	48	43	18.9	2.1	1.8
1967	314	118	182	18.3	5.0	7.1
1968	381	164	187	18.1	6.8	7.1
1969	654	218	401	18.8	8.9	14.8
1970	847	315	458	19.0	12.7	16.6
1971	907	410	471	18.2	16.3	16.7
1972	890	393	479	18.2	15.5	16.8
1973	734	363	350	18.3	14.1	12.4
1974	868	420	434	18.0	16.2	15.5
1975	832	319	424	19.6	12.3	15.0
1976	941	461	415	18.9	17.8	14.5
1977	755	333	356	18.8	13.0	12.3
1978	804	392	331	19.1	15.6	11.3
1979	812	348	406	18.8	14.3	13.7
1980	875	409	419	18.3	17.4	14.0
1981	903	342	476	19.8	14.9	15.7
1982	616	220	357	19.3	9.7	11.8
1983	654	265	338	19.1	11.8	11.3
1984	664	285	346	18.9	12.9	11.7
1985	613	266	294	19.1	12.2	10.1
1986	636	281	315	18.8	13.2	11.0
1987	673	293	281	19.7	14.1	10.0
1988	580	236	320	18.7	11.7	11.5
1989	623	271	308	18.7	13.7	11.3
1990	594	217	330	19.2	11.0	12.3
1991	619	250	340	18.8	12.6	13.0
1992	690	299	319	19.4	14.7	12.5
1993	670	324	298	18.7	15.4	11.9
1994	821	408	350	18.4	18.8	14.2
1995	906	463	393	18.0	21.0	16.4
1996	958	492	417	17.9	22.1	17.7
1997	1,014	513	435	18.1	22.7	18.9
1998	1,177	603	516	18.0	26.5	22.5
1999²	1,471	697	656	18.4	30.6	28.6
2000³	1,486	682	715	18.6	29.9	31.6

20624 (4.9A)
Table H.46 Estimated Numbers (in Thousands) of Persons Who First Used Inhalants During the Years 1965 to 2000, Their Mean Age at First Use, and Annual Age-Specific Rates of First Use (Per 1,000 Person-Years of Exposure): Based on 1999-2001 NHSDAs


	NUMBER OF INITIATES (1,000s)			MEAN AGE	AGE-SPECIFIC RATES¹
YEAR	All Ages	12-17	18-25	MEAN AGE	12-17	18-25
1965	78	27	*	13.4	1.2	*
1966	156	88	35	15.6	3.8	1.4
1967	149	69	33	17.6	2.9	1.3
1968	227	123	60	15.9	5.1	2.3
1969	227	129	67	15.5	5.3	2.4
1970	229	126	75	16.9	5.1	2.6
1971	243	142	79	15.8	5.6	2.7
1972	287	129	113	17.1	5.0	3.7
1973	327	145	159	18.1	5.6	5.3
1974	411	197	188	17.6	7.5	6.2
1975	504	224	224	18.2	8.6	7.2
1976	517	233	224	17.9	9.0