10724

Table 6.1C Standard Errors of Estimated Numbers (in Thousands) of the Number of Days Used Marijuana in the Past Year Among Past Year Users and the Number of Days Used Marijuana in the Past Month Among Past Month Users, by Age Group: 1999 and 2000 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	268	215	43	37	86	80	245	191
12-49	212	171	34	29	60	53	198	159
50-99	121	114	25	21	47	44	109	102
100-299	187	169	30	32	67	69	171	146
300 or More	99	114	20	21	53	49	82	98
Number of Days Used in Past Month Among Past Month Users
1-2	184	133	29	27	59	48	172	124
3-5	127	132	22	25	42	41	120	122
6-19	123	126	26	22	55	47	107	116
20 or More	161	147	23	27	65	57	145	129

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.1D Standard Errors of Percentages Reporting the Number of Days Used Marijuana in the Past Year Among Past Year Users and the Number of Days Used Marijuana in the Past Month Among Past Month Users, by Age Group: 1999 and 2000 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	1.06	0.82	0.99	0.99	0.89	0.82	2.10	1.62
12-49	0.91	0.81	0.86	0.82	0.72	0.70	1.86	1.60
50-99	0.62	0.57	0.70	0.63	0.61	0.58	1.21	1.11
100-299	0.87	0.82	0.80	0.85	0.80	0.77	1.76	1.56
300 or More	0.50	0.55	0.57	0.63	0.67	0.63	0.91	1.05
Number of Days Used in Past Month Among Past Month Users
1-2	1.44	1.05	1.34	1.36	1.13	1.01	2.98	1.99
3-5	1.15	1.08	1.25	1.25	0.93	0.88	2.40	2.10
6-19	1.03	1.04	1.30	1.15	1.09	0.97	2.06	2.03
20 or More	1.27	1.10	1.17	1.38	1.30	1.03	2.57	2.14

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.1P P-Values from Tests of Differences in Percentages Reporting the Number of Days Used Marijuana in the Past Year Among Past Year Users and the Number of Days Used Marijuana in the Past Month Among Past Month Users, by Age Group: 2000 Versus 1999 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	0.1414		0.1463		0.5514		0.2690
12-49	0.3174		0.1932		0.8308		0.4365
50-99	0.8648		0.8404		0.8885		0.7704
100-299	0.1606		0.0052		0.5442		0.4261
300 or More	0.0430		0.4285		0.6723		0.0461
Number of Days Used in Past Month Among Past Month Users
1-2	0.3832		0.2617		0.7890		0.5010
3-5	0.9883		0.6211		0.9199		0.9377
6-19	0.5722		0.9555		0.2630		0.8272
20 or More	0.6610		0.4463		0.5068		0.5206

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.2C Standard Errors of Estimated Numbers (in Thousands) of the Number of Days Used Cocaine in the Past Year Among Past Year Users and the Number of Days Used Cocaine in the Past Month Among Past Month Users, by Age Group: 1999 and 2000 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	117	94	17	20	51	43	106	79
12-49	68	87	11	13	27	25	61	83
50-99	78	43	9	7	17	17	74	38
100-299	70	54	8	10	19	13	65	52
300 or More	31	27	1	3	9	4	29	26
Number of Days Used in Past Month Among Past Month Users
1-2	81	50	10	9	27	25	*	*
3-5	52	81	7	8	16	14	47	*
6-19	68	45	5	*	13	10	*	*
20 or More	43	20	*	2	5	4	*	20

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.2D Standard Errors of Percentages Reporting the Number of Days Used Cocaine in the Past Year Among Past Year Users and the Number of Days Used Cocaine in the Past Month Among Past Month Users, by Age Group: 1999 and 2000 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	2.31	2.25	3.24	3.44	2.07	2.04	4.17	3.97
12-49	1.66	2.12	2.54	2.91	1.64	1.70	3.00	3.91
50-99	1.84	1.25	2.18	1.68	1.09	1.26	3.45	2.24
100-299	1.69	1.52	2.01	2.25	1.18	0.97	3.15	2.88
300 or More	0.80	0.78	0.37	0.63	0.62	0.34	1.51	1.52
Number of Days Used in Past Month Among Past Month Users
1-2	3.95	3.95	5.31	5.12	3.47	3.47	*	*
3-5	2.99	4.88	4.58	4.64	3.02	3.02	4.47	*
6-19	3.71	3.31	3.75	*	2.44	2.23	*	*
20 or More	2.62	1.65	*	1.14	1.07	1.04	*	2.84

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.2P P-Values from Tests of Differences in Percentages Reporting the Number of Days Used Cocaine in the Past Year Among Past Year Users and the Number of Days Used Cocaine in the Past Month Among Past Month Users, by Age Group: 2000 Versus 1999 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	0.8643		0.8373		0.5671		0.9783
12-49	0.1428		0.4497		0.7031		0.1054
50-99	0.5201		0.1694		0.4369		0.4596
100-299	0.1981		0.5623		0.2791		0.2248
300 or More	0.8589		0.9783		0.4983		1.0000
Number of Days Used in Past Month Among Past Month Users
1-2	0.3233		0.8233		0.9273		*
3-5	0.0775		0.1772		0.5547		*
6-19	0.6635		*		0.4518		*
20 or More	0.3067		*		0.7154		*

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.3C Standard Errors of Estimated Numbers (in Thousands) of the Number of Days Used Hallucinogens in the Past Year Among Past Year Users and the Number of Days Used Hallucinogens in the Past Month Among Past Month Users, by Age Group: 1999 and 2000 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	85	96	31	29	61	69	*	*
12-49	38	61	16	15	31	27	*	*
50-99	30	28	9	11	18	14	*	*
100-299	25	17	10	9	12	14	*	4
300 or More	3	3	1	1	3	3	*	*
Number of Days Used in Past Month Among Past Month Users
1-2	52	49	16	17	33	30	*	*
3-5	27	25	8	8	15	12	*	*
6-19	13	13	7	7	11	11	*	*
20 or More	3	8	2	4	2	2	*	*

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.3D Standard Errors of Percentages Reporting the Number of Days Used Hallucinogens in the Past Year Among Past Year Users and the Number of Days Used Hallucinogens in the Past Month Among Past Month Users, by Age Group: 1999 and 2000 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	1.43	1.50	1.91	1.74	1.58	1.53	*	*
12-49	1.12	1.41	1.59	1.46	1.35	1.27	*	*
50-99	0.88	0.78	1.00	1.13	0.89	0.71	*	*
100-299	0.75	0.47	1.08	0.95	0.60	0.68	*	0.67
300 or More	0.11	0.08	0.14	0.09	0.16	0.14	*	*
Number of Days Used in Past Month Among Past Month Users
1-2	2.95	2.19	3.63	3.54	3.07	2.63	*	*
3-5	2.68	2.05	2.74	2.81	2.76	2.17	*	*
6-19	1.46	1.30	2.68	2.41	1.92	1.92	*	*
20 or More	0.35	0.82	0.90	1.42	0.42	0.45	*	*

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.3P P-Values from Tests of Differences in Percentages Reporting the Number of Days Used Hallucinogens in the Past Year Among Past Year Users and the Number of Days Used Hallucinogens in the Past Month Among Past Month Users, by Age Group: 2000 Versus 1999 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	0.4808		0.1638		0.5697		*
12-49	0.3432		0.4835		0.4043		*
50-99	0.9911		0.0138		0.2614		*
100-299	0.9046		0.3758		0.0805		*
300 or More	0.3357		0.1022		0.7034		*
Number of Days Used in Past Month Among Past Month Users
1-2	0.6461		0.9070		0.3421		*
3-5	0.3618		0.8171		0.2057		*
6-19	0.7133		0.6676		0.9782		*
20 or More	0.0331		0.4834		0.3214		*

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.4C Standard Errors of Estimated Numbers (in Thousands) of the Number of Days Used Inhalants in the Past Year Among Past Year Users and the Number of Days Used Inhalants in the Past Month Among Past Month Users, by Age Group: 1999 and 2000 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	63	55	29	23	41	38	*	*
12-49	40	55	18	17	16	17	*	*
50-99	28	29	12	12	9	9	*	*
100-299	33	29	11	11	12	10	*	*
300 or More	3	2	2	2	2	1	*	*
Number of Days Used in Past Month Among Past Month Users
1-2	30	48	15	11	*	*	*	*
3-5	36	29	9	9	*	*	*	*
6-19	12	*	6	8	*	4	*	*
20 or More	*	*	3	3	*	*	*	*

*Low precision; no estimate reported.

Source: SAMHSA, Office of Applied Studies, National Household Survey on Drug Abuse, 1999 and 2000.

10724

Table 6.4D Standard Errors of Percentages Reporting the Number of Days Used Inhalants in the Past Year Among Past Year Users and the Number of Days Used Inhalants in the Past Month Among Past Month Users, by Age Group: 1999 and 2000 List of Tables: Prevalence Estimates and Sample Sizes

Frequency of Use			AGE GROUP (Years)
	Total		12-17		18-25		26 or Older
	1999	2000	1999	2000	1999	2000	1999	2000
Number of Days Used in Past Year Among Past Year Users
1-11	2.29	2.28	2.03	2.04	2.54	2.80	*	*
12-49	1.81	2.21	1.74	1.68	1.91	2.28	*	*
50-99	1.35	1.44	1.22	1.33	1.19	1.22	*	*
100-299	1.60	1.43	1.11	1.30	1.56	1.46	*	*
300 or More	0.15	0.11	0.24	0.24	0.28	0.12	*	*
Number of Days Used in Past Month Among Past Month Users
1-2	4.76	5.44	3.69