Driving After Drug or Alcohol Use

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APPENDIX A: DETAILED DATA TABLES

TABLE 1a.Age, Gender, Racial/Ethnic, and Regional Distribution of Total Driving Population Age 16+ who Reported Driving in the Past Year, 1996

	Drivers Age 16+
Demographic Characteristic	Unweighted Total	Weighted Percent
TOTAL	12,252	100.0%
AGE		100.0%
16-18 Yrs	1,401	4.9
19-20 Yrs	803	3.2
21-25 Yrs	2,215	8.8
26-34 Yrs	4,511	18.6
35-49 Yrs	2,441	32.4
50+ Yrs	881	32.2
GENDER		100.0%
Male	5,344	50.1
Female	6,908	49.9
RACE/ETHNICITY		100.0%
White (Non-Hispanic)	6,504	79.2
Black (Non-Hispanic)	2,605	9.2
Hispanic	2,747	7.8
Other	396	3.9
REGION		100.0%
Northeast	1,793	18.4
North Central	2,537	25.3
South	4,960	34.8
West	2,962	21.5
Note: This table includes all respondents who drove a car or other motor vehicle in the past year. The remainder of the tables include only those respondents who also reported whether or not they drove within two hours of using drugs and/or alcohol in the past year.
Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 1b.Marital, Educational, Employment, and Personal Income Distribution of Total Driving Population Age 16+ who Reported Driving in the Past Year, 1996

	Drivers Age 16+
Demographic Characteristic	Unweighted Total	Weighted Percent
TOTAL	12,252	100.0%
MARITAL STATUS		100.0%
Married	5,410	61.9
Div./Sep./Wid.	1,592	15.3
Never Married	5,250	22.8
EDUCATION		100.0%
High School	2,159	15.0
High School Grad	3,834	34.6
Some College	2,957	24.2
College Grad	2,362	26.1
EMPLOYMENT STATUS		100.0%
Full-Time	6,864	55.6
Part-Time	1,602	12.0
Unemployed	640	3.7
Not in Work Force¹	2,206	28.7
PERSONAL INCOME		100.0%
<$10,000	4,840	29.7
$10,000-$19,999	3,161	24.2
$20,000-$39,999	3,144	29.3
$40,000-$49,999	528	6.8
$50,000-$74,999	405	6.4
$75,000+	174	3.6

Note: This table includes all respondents who drove a car or other motor vehicle in the past year. The remainder of the tables include only those respondents who also reported whether or not they drove within two hours of using drugs and/or alcohol in the past year. ¹Includes full-time homemakers, non-working students, the retired, and the disabled. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 2.Percentage of Drivers Age 16+ in Age, Gender, and Regional Groups who Drove Within Two Hours of Substance Use by Substance Used, 1996

	Drove within Two Hours of Substance Use
	After Alcohol Use		After Marijuana Use		After Other Drug Use¹
Demographic Characteristic	Weighted Total (in 1000's)	Weighted Percent	Weighted Total (in 1000's)	Weighted Percent	Weighted Total (in 1000's)	Weighted Percent
TOTAL	45,317	26.6%	6,327	3.7%	4,239	2.5%
AGE
16-20 Yrs	2,913	21.2	1,571	11.4	509	3.8*
21-34 Yrs	16,423	35.0	2,659	5.6	1,568	3.4
35+ Yrs	25,980	23.7	2,097	1.9*	2,161	2.0*
GENDER
Male	30,976	36.4	4,604	5.4	2,233	2.7
Female	14,341	16.9	1,723	2.0	2,006	2.4
REGION
Northeast	7,974	25.4	866	2.7*	655	2.1*
North Central	13,948	32.4	1,740	4.0	907	2.1*
South	14,267	24.1	2,328	3.9	1,579	2.7
West	9,127	25.1	1,393	3.8	1,098	3.1*
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹Includes cocaine, and the medical and non-medical use of tranquilizers, stimulants, and sedatives. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 3a.Percentage of Drivers 16+ within Age, Gender, Racial/Ethnic, and Regional Groups Age who Drove within Two Hours of Substance Use in the Past Year by Substance Used, 1996

				Drove within Two Hours of Substance Use
	TOTAL	Non-Impaired Driver¹		After Alcohol Use Only (No Drugs)		After Drug Use² (With or Without Alcohol)
Demographic Characteristic	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	100.0%	8,610	72.1%	2,460	22.6%	777	5.3%
AGE
16-18 Yrs	100.0%	1,115	79.5	103	8.7	144	11.7
19-20 Yrs	100.0%	586	71.1	98	14.9	93	14.0
21-25 Yrs	100.0%	1,457	62.0	544	29.1	162	8.9
26-34 Yrs	100.0%	3,017	64.4	1,092	29.0	250	6.6
35-49 Yrs	100.0%	1,732	68.8	508	25.6	112	5.6
50+ Yrs	100.0%	703	81.8	115	16.7	16	1.5*
GENDER
Male	100.0%	3,286	62.4	1,419	30.7	457	6.8
Female	100.0%	5,324	81.8	1,041	14.4	320	3.8
RACE/ETHNICITY
White (Non-Hispanic)	100.0%	4,140	69.6	1,689	24.8	506	5.6
Black (Non-Hispanic)	100.0%	2,026	81.9	310	13.4	136	4.8
Hispanic	100.0%	2,123	79.0	414	16.8	118	4.3
Other	100.0%	321	86.5	47	9.6*	17	4.0*
REGION
Northeast	100.0%	1,257	73.7	379	22.0	90	4.3
North Central	100.0%	1,574	66.2	680	28.4	211	5.4
South	100.0%	3,671	75.0	822	19.5	289	5.5
West	100.0%	2,108	73.0	579	21.0	187	6.0
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹"Non-impaired" drivers are those respondents who drove a motor vehicle in the 12 months prior to the NHSDA interview, but reported that they did not drive within two hours after using drugs and/or alcohol during that same period. ²Includes marijuana, cocaine, and the medical and non-medical use of tranquilizers, stimulants, and sedatives. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 3b.Percentage of Drivers Age 16+ within Marital, Educational, Employment, and Personal Income Groups who Drove within Two Hours of Substance Use in the Past Year by Substance Used, 1996

				Drove within Two Hours of Substance Use
	TOTAL	Non-Impaired Driver¹		After Alcohol Use Only (No Drugs)		After Drug Use² (With or Without Alcohol)
Demographic Characteristic	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	100.0%	8,610	72.1%	2,460	22.6%	777	5.3%
MARITAL STATUS
Married	100.0%	3,974	74.2	1,072	22.7	181	3.1
Div./Sep./Wid.	100.0%	1,120	74.4	325	20.1	96	5.5
Never Married	100.0%	3,516	64.9	1,063	23.9	500	11.2
EDUCATION
<High School	100.0%	1,681	82.4	240	11.3	150	6.3
High School Grad	100.0%	2,749	75.8	706	18.9	251	5.3
Some College	100.0%	2,008	71.0	653	23.3	189	5.7
College Grad	100.0%	1,403	61.0	809	35.0	101	3.9
EMPLOYMENT STATUS
Full-Time	100.0%	4,471	65.0	1,785	29.4	399	5.6
Part-Time	100.0%	1,154	74.2	294	19.4	106	6.5
Unemployed	100.0%	437	68.1	99	20.8	76	11.1
Not in Work Force³	100.0%	1,779	84.3	230	12.6	110	3.1
PERSONAL INCOME
<$10,000	100.0%	3,786	82.5	525	10.9	353	6.6
$10,000 - $19,999	100.0%	2,257	77.3	592	17.8	197	4.9
$20,000 - $39,999	100.0%	2,017	69.3	876	25.8	167	4.9
$40,000 - $49,999	100.0%	285	60.1	191	34.6	32	5.3*
$50,000 - $74,999	100.0%	204	53.9	177	42.9	17	3.3*
$75,000+	100.0%	61	30.5	99	63.7	11	5.8*
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹"Non-impaired" drivers are those respondents who drove a motor vehicle in the 12 months prior to the NHSDA interview, but reported that they did not drive within two hours after using drugs and/or alcohol during that same period. ²Includes marijuana, cocaine, and the medical and non-medical use of tranquilizers, stimulants, and sedatives. ³Includes full-time homemakers, non-working students, the retired, and the disabled. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 4.Percentage of Drivers Age 16+ within Age by Gender, Racial/Ethnic by Age, and Racial/Ethnic by Gender Groups who Drove within Two Hours of Substance Use in the Past Year by Substance Used, 1996

				Drove within Two Hours of Substance Use
	TOTAL	Non-Impaired Driver¹		After Alcohol Use Only (No Drugs)		After Drug Use² (With or Without Alcohol)
Demographic Characteristic	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	100.0%	8,610	72.1%	2,460	22.6%	777	5.3%
AGE BY GENDER
16-20 Years
Male	100.0%	778	71.8	123	13.3	145	14.8
Female	100.0%	923	81.4	78	8.6	92	10.0
21+ Years
Male	100.0%	2,508	61.5	1,296	32.4	312	6.1
Female	100.0%	4,401	81.8	963	14.8	228	3.3
RACE/ETHNICITY BY AGE
White (Non-Hispanic)
16-20 Years	100.0%	838	73.3	131	12.8	152	13.9
21+ Years	100.0%	3,302	69.3	1,558	25.8	354	4.9
Black (Non-Hispanic)
16-20 Years	100.0%	403	83.3	25	7.1*	36	9.6*
21+ Years	100.0%	1,623	81.7	285	14.1	100	4.2
Hispanic
16-20 Years	100.0%	386	80.5	41	8.8*	44	10.7*
21+ Years	100.0%	1,737	78.8	373	17.8	74	3.4*
RACE/ETHNICITY BY GENDER
White (Non-Hispanic)
Male	100.0%	1,485	59.0	916	33.8	287	7.2
Female	100.0%	2,655	80.0	773	16.0	219	4.0
Black (Non-Hispanic)
Male	100.0%	684	74.5	180	19.8	76	5.7
Female	100.0%	1,342	88.6	130	7.5	60	3.9*
Hispanic
Male	100.0%	978	73.0	292	21.9	81	5.1
Female	100.0%	1,145	87.4	122	9.5	37	3.1*
Note: This table is restricted to people who drove a car or other motor vehicle in the past year.

TABLE 5.Percentage of Drivers Age 16+ Arrested and Not Arrested and on Probation and Not on Probation in the Past Year who Drove within Two Hours of Substance Use in the Past Year by Substance Used, 1996

				Drove within Two Hours of Substance Use
	TOTAL	Non-Impaired Driver¹		After Alcohol Use Only (No Drugs)		After Drug Use² (With or Without Alcohol)
During the Past Year	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	100.0%	8,515	72.0%	2,433	22.7%	762	5.3%
ARRESTED (FOR ANY REASON)
Yes	100.0%	653	50.4	381	32.1	244	17.5
No	100.0%	7,862	74.3	2,052	21.7	518	4.0
ON PROBATION (FOR ANY REASON)
Yes	100.0%	132	56.5	68	21.4	65	22.1
No	100.0%	8,200	72.0	2,331	22.9	690	5.1
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹"Non-impaired" drivers are those respondents who drove a motor vehicle in the 12 months prior to the NHSDA interview, but reported that they did not drive within two hours after using drugs and/or alcohol during that same period. ²Includes marijuana, cocaine, and the medical and non-medical use of tranquilizers, stimulants, and sedatives. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 6a.Age, Gender, Racial/Ethnic, and Regional Distribution of Drivers Age 16+ who Drove within Two Hours of Substance Use in the Past Year by Substance Used, 1996

			Drove within Two Hours of Substance Use
	Non-Impaired Driver¹		After Alcohol Use Only (No Drugs)		After Drug Use² (With or Without Alcohol)
Demographic Characteristic	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	8,610	72.1%	2,460	22.6%	777	5.3%
AGE		100.0%		100.0%		100.0%
16-18 Yrs	1,115	5.4	103	1.9*	144	10.8
19-20 Yrs	586	3.1	98	2.1*	93	8.3
21-25 Yrs	1,457	7.7	544	11.6	162	15.0
26-34 Yrs	3,017	16.7	1,092	24.0	250	23.2
35-49 Yrs	1,732	31.1	508	37.0	112	33.9
50+ Yrs	703	35.9	115	23.5	16	8.7*
GENDER		100.0%		100.0%		100.0%
Male	3,286	43.4	1,419	68.2	457	64.2
Female	5,324	56.6	1,041	31.8	320	35.8
RACE/ETHNICITY		100.0%		100.0%		100.0%
White (Non-Hispanic)	4,140	76.6	1,689	87.2	506	82.9
Black (Non-Hispanic)	2,026	10.3	310	5.4	136	8.0
Hispanic	2,123	8.5	414	5.7	118	6.2
Other	321	4.7	47	1.7*	17	2.9*
REGION		100.0%		100.0%		100.0%
Northeast	1,257	18.9	379	18.1	90	14.9
North Central	1,574	23.2	680	31.8	211	25.5
South	3,671	36.3	822	30.2	289	35.6
West	2,108	21.6	579	19.9	187	24.0
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹"Non-impaired" drivers are those respondents who drove a motor vehicle in the 12 months prior to the NHSDA interview, but reported that they did not drive within two hours after using drugs and/or alcohol during that same period. ²Includes marijuana, cocaine, and the medical and non-medical use of tranquilizers, stimulants, and sedatives. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 6b.Marital, Educational, Employment, and Personal Income Distribution of Drivers Age 16+ who Drove within Two Hours of Substance Use in the Past Year by Substance Used, 1996

			Drove within Two Hours of Substance Use
	Non-Impaired Driver¹		After Alcohol Use Only (No Drugs)		After Drug Use² (With or Without Alcohol)
Demographic Characteristic	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	8,610	72.1%	2,460	22.6%	777	5.3%
MARITAL STATUS		100.0%		100.0%		100.0%
Married	3,974	63.5	1,072	62.0	181	36.1
Div./Sep./Wid.	1,120	15.9	325	13.7	96	15.7
Never Married	3,516	20.6	1,063	24.2	500	48.2
EDUCATION		100.0%		100.0%		100.0%
<High School	1,681	17.1	240	7.3	150	18.1
High School Grad	2,749	36.5	706	28.2	251	35.6
Some College	2,008	23.7	653	24.2	189	26.2
College Grad	1,403	22.6	809	40.2	101	20.1
EMPLOYMENT STATUS		100.0%		100.0%		100.0%
Full-Time	4,471	50.5	1,785	71.1	399	60.2
Part-Time Only	1,154	12.4	294	10.1	106	14.9
Unemployed	437	3.4	99	3.3	76	7.8
Not in Work Force³	1,779	33.6	230	15.6	110	17.1
PERSONAL INCOME		100.0%		100.0%		100.0%
<$10,000	3,786	34.0	525	14.4	353	36.6
$10,000 - $19,999	2,257	25.7	592	18.9	197	22.1
$20,000 - $39,999	2,017	28.4	876	33.8	167	26.9
$40,000 - $49,999	285	5.4	191	10.0	32	6.4*
$50,000 - $74,999	204	4.9	177	12.4	17	4.0*
$75,000+	61	1.6*	99	10.5	11	4.1*
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹"Non-impaired" drivers are those respondents who drove a motor vehicle in the 12 months prior to the NHSDA interview, but reported that they did not drive within two hours after using drugs and/or alcohol during that same period. ²Includes marijuana, cocaine, and the medical and non-medical use of tranquilizers, stimulants, and sedatives. ³Includes full-time homemakers, non-working students, the retired, and the disabled. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 7.Age by Gender, Racial/Ethnic by Age, and Racial/Ethnic by Gender Distribution of Drivers Age 16+ who Drove within Two Hours of Substance Use in the Past Year by Substance Used, 1996

			Drove within Two Hours of Substance Use
	Non-Impaired Driver¹		After Alcohol Use Only (No Drugs)		After Drug Use² (With or Without Alcohol)
Demographic Characteristic	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	8,610	72.1%	2,460	22.6%	777	5.3%
AGE BY GENDER
16-20 Years		100.0%		100.0%		100.0%
Male	778	50.9	123	64.6	145	63.6
Female	923	49.1	78	35.4	92	36.4
21+ Years		100.0%		100.0%		100.0%
Male	2,508	42.7	1,296	68.4	312	64.3
Female	4,401	57.3	963	31.6	228	35.7
RACE /ETHNICITY BY AGE
White (Non-Hispanic)		100.0%		100.0%		100.0%
16-20 Years	838	7.8	131	3.8	152	18.4
21+ Years	3,302	92.2	1,558	96.2	354	81.6
Black (Non-Hispanic)		100.0%		100.0%		100.0%
16-20 Years	403	10.5	25	5.5*	36	20.8*
21+ Years	1,623	89.5	285	94.5	100	79.2
Hispanic		100.0%		100.0%		100.0%
16-20 Years	386	11.9	41	6.1*	44	29.2*
21+ Years	1,737	88.1	373	93.9	74	70.8
RACE/ETHNICITY BY GENDER
White (Non-Hispanic)		100.0%		100.0%		100.0%
Male	1,485	41.9	916	67.4	287	63.6
Female	2,655	58.1	773	32.6	219	36.4
Black (Non-Hispanic)		100.0%		100.0%		100.0%
Male	684	43.6	180	70.8	76	57.6
Female	1,342	56.4	130	29.2	60	42.4*
Hispanic		100.0%		100.0%		100.0%
Male	978	54.5	292	76.7	81	70.3*
Female	1,145	45.5	122	23.3	37	29.7*
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹"Non-impaired" drivers are those respondents who drove a motor vehicle in the 12 months prior to the NHSDA interview, but reported that they did not drive within two hours after using drugs and/or alcohol during that same period. ²Includes marijuana, cocaine, and the medical and non-medical use of tranquilizers, stimulants, and sedatives. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 8.Past-Year Arrest and Probation Status Distribution of Drivers Age 16+ who Drove within Two Hours of Substance Use in the Past Year by Substance Used, 1996

	Drove within Two Hours of Substance Use
	Non-Impaired Driver¹		After Alcohol Use Only (No Drugs)		After Drug Use² (With or Without Alcohol)
During the Past Year	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	8,515	72.0%	2,433	22.7%	762	5.3%
ARRESTED (FOR ANY REASON)		100.0%		100.0%		100.0%
Yes	653	6.8	381	13.6	244	31.7
No	7,862	93.2	2,052	86.4	518	68.3
ON PROBATION (FOR ANY REASON)		100.0%		100.0%		100.0%
Yes	132	1.3*	68	1.5*	65	6.6
No	8,200	98.7	2,331	98.5	690	93.4
Note: This table is restricted to people who drove a car or other motor vehicle in the past year.

TABLE 9.Distribution of Size of Road Driven, Area Driven, Day of Week Driven, and Time of Day Driving Began on Most Recent Occasion of Driving within Two Hours of Marijuana Use for Drivers Age 16+ who Drove Following Marijuana Use in the Past Year by Age Group, 1996

	TOTAL		16-20 Years		21+ Years
Driving Patterns	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
SIZE OF ROAD		100.0%		100.0%		100.0%
Interstate/Highway/Freeway	235	44.6	80	39.1	155	46.5
Only on Smaller Roads	328	55.4	124	60.9	204	53.5
AREA		100.0%		100.0%		100.0%
Rural (open country)	119	23.7	37	17.9*	82	25.8
Urban (city or town)	329	55.7	127	61.5	202	53.7
Suburban (town just outside of a large city)	107	20.6	39	20.6*	68	20.5
DAY OF WEEK		100.0%		100.0%		100.0%
Weekday¹	158	33.5	59	35.0	99	32.9
Weekend²	334	66.5	122	65.0	212	67.1
TIME OF DAY BEGAN		100.0%		100.0%		100.0%
12:00 a.m. to 5:59 a.m.	135	20.5	59	31.5	76	16.7
6:00 a.m. to 11:59 a.m.	46	8.2*	10	5.6*	36	9.1*
12:00 p.m. to 5:59 p.m.	120	22.5	37	15.9*	83	24.8
6:00 p.m. to 11:59 p.m.	242	48.8	91	47.0	151	49.4
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹Monday, Tuesday, Wednesday, or Thursday. ²Friday, Saturday, or Sunday. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 10.Distribution of Starting Point and Destination on Most Recent Occasion of Driving within Two Hours of Marijuana Use for Drivers Age 16+ who Drove Following Marijuana Use in the Past Year by Age Group, 1996

	TOTAL		16-20 Years		21+ Years
Starting Point and Destination	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
STARTING POINT		100.0%		100.0%		100.0%
Home	161	35.9	41	22.3*	120	40.7
Friend/Relative’s Home	265	44.7	118	60.3	147	39.2
Public Location¹	111	19.4	38	17.4*	73	20.1
DESTINATION		100.0%		100.0%		100.0%
Home	247	47.2	83	43.4	164	48.6
Friend/Relative’s Home	131	20.3	58	27.9	73	17.7
Public Location¹	159	32.5	55	28.7	104	33.8
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹Includes bar or nightclub, restaurant, sporting event, concert, workplace, no place in particular, or unspecified. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 11.Percentage of Drivers Age 16+ who Drove within Two Hours of Marijuana Use in the Past Year Reporting Reasons for Driving on Most Recent Occasion of Driving Following Marijuana Use by Age Group, 1996

	16-20 Years		21+ Years
Reported Reason for Driving	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
No other way to get there	125	68.5	191	58.6
Not high enough to cause a crash	104	57.3	196	60.4
Police not likely to catch me	68	36.9	113	37.9
No one else available to drive	86	48.2	134	45.0
Had an appointment or curfew	61	31.4	41	15.5*
Other reason	57	29.9	69	28.3
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. Responses do not sum to 100% because respondents could mark more than one answer. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 12.Distribution of Perceived Extent to which Marijuana Affected Ability to Drive Safely on Most Recent Occasion of Driving within Two Hours of Marijuana Use for Drivers Age 16+ who Drove Following Marijuana Use in the Past Year by Age Group, 1996

			Amount Marijuana Affected Ability to Drive Safely
	TOTAL		A Lot/A Little		Not at All
	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	571	100.0%	273	44.2	298	55.8
16-20 Years	208	100.0%	107	48.2	101	51.8
21+ Years	363	100.0%	166	42.8	197	57.2
Responses do not sum to 100% because respondents could mark more than one answer. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 13.Distribution of Perceived Likelihood of Being Stopped by the Police when Driving Following Marijuana Use Compared to when Driving on Other Occasions for Drivers Age 16+ who Drove within Two Hours of Marijuana Use in the Past Year by Age Group, 1996

			How Likely Stopped by Police If Use Marijuana and Drive
	TOTAL		A Lot/A Little More Likely		No More Likely
	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	565	100.0%	218	34.9	347	65.1
16-20 Years	208	100.0%	95	45.7	113	54.3
21+ Years	357	100.0%	123	31.1	234	68.9
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 14.Distribution of Number of Days in Past Month Drove within Two Hours of Alcohol or Marijuana Use, for All Ages and within Age Groups, for Drivers Age 16+ who Drove Following Alcohol Use Only or Marijuana Use in the Past Year by Substance Type, 1996

	Alcohol		Marijuana
Number of Days	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	2,390	100.0%	578	100.0%
None	903	36.5	178	31.5
1-5 Days	1,311	56.5	250	44.0
6+ Days	176	7.0	150	24.5
16-20 YEARS	195	100.0%	207	100.0%
None	84	44.3	59	26.6
1-5 Days	93	45.7	92	44.2
6+ Days	18	10.0*	56	29.2
21+ YEARS	2,195	100.0%	371	100.0%
None	819	36.2	119	33.1
1-5 Days	1,218	56.9	158	43.9
6+ Days	158	6.9	94	23.0
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 15.Distribution of Level of Past-Month Alcohol Use or Past-Year Marijuana Use for Drivers Age 16+ who Drove within Two Hours of Alcohol Use Only or Marijuana Use in the Past Year by Age Group, 1996

		ALCOHOL¹					MARIJUANA²
	TOTAL	Heavy Use		Medium/Low Use		TOTAL	Heavy Use		Medium/Low Use
	Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	100.0%	377	14.1	1,808	85.9	100.0%	340	59.7	228	40.3
16-20 Years	100.0%	52	32.0*	110	68.0	100.0%	128	63.1	79	36.9
21+ Years	100.0%	325	13.5	1,698	86.5	100.0%	212	58.5	149	41.5
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹Heavy = Had at least five drinks on at least five occasions in the past 30 days; Medium = Had at least five drinks on at least one, but no more than four occasions during the past 30 days (i.e., binge drinking); Low = Used alcohol, but had at least one, but no more than four drinks on any occasion during the past 30 days. ²Heavy = Used weekly; Medium = Used monthly, but not weekly; Low = Used in past year, but not weekly or monthly. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 16.Distribution of Whether or Not Other Substances Were Also Used on Most Recent Occasion of Driving within Two Hours of Marijuana Use for Drivers Age 16+ who Drove Following Marijuana Use in the Past Year by Age Group, 1996

	TOTAL	Alone		With Alcohol		With Other Drug
	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	100.0%	332	62.0	184	33.2	34	4.8
16-20 Years	100.0%	137	70.1	55	24.1	13	5.9*
21+ Years	100.0%	195	59.1	129	36.5	21	4.4*
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 17.Percentage of Drivers Age 16+ who Drove within Two Hours of Using Marijuana and Another Substance in the Past Year by Age Group, 1996

	16-20 Years		21+ Years
Drove after Using Marijuana and...	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
Alcohol	167	77.7	329	85.5
Any Other Drug¹	79	39.7	107	24.5
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. Responses do not sum to 100% because respondents can fall into more than one category. ¹Includes cocaine, heroin, hallucinogens, inhalants, and the medical and non-medical use of tranquilizers, analgesics, stimulants, and sedatives. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 18.Distribution of Number of Drinks Consumed, Number of Hours between First and Last Drink, and Time between Last Drink and when Driving Began on Most Recent Occasion of Driving within Two Hours of Alcohol Use for Drivers Age 16+ who Drove Following Alcohol Use in the Past Year by Age Group, 1996

	TOTAL		16-20 Years		21+ Years
	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
NUMBER OF DRINKS		100.0%		100.0%		100.0%
1-2 Drinks	945	58.8	84	36.3	861	60.1
3-4 Drinks	542	26.4	56	24.6	486	26.5
5+ Drinks	404	14.8	77	39.1	327	13.5
HOURS BETWEEN FIRST AND LAST DRINK		100.0%		100.0%		100.0%
4+ Hours	494	22.7	55	25.1	439	22.6
2-4 Hours	555	27.6	55	25.7	500	27.7
1-2 Hours	359	22.4	41	16.1*	318	22.8
<1 Hour	310	16.0	59	29.8	251	15.2
Only Had 1 Drink	192	11.3	10	3.2*	182	11.7
TIME BETWEEN LAST DRINK AND WHEN DRIVING BEGAN		100.0%		100.0%		100.0%
1-2 Hours	891	42.4	103	40.8	788	42.5
<1 Hour	1030	57.6	117	59.2	913	57.5
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 19.Distribution of Estimated Blood Alcohol Concentration (BAC) Levels¹ on Most Recent Occasion of Driving within Two Hours of Alcohol Use for Drivers Age 16+ who Drove Following Alcohol Use in the Past Year by Age within Gender, 1996

		Males					Females
	TOTAL	Total	16-20 Years		21+ Years		Total	16-20 Years		21+ Years
BAC Level	Weighted Percent	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent	Weighted Percent	Unweighted Total	Weighted Percent	Unweighted Total	Weighted Percent
TOTAL	100.0%	100.0%	137	100.0%	1,019	100.0%	100.0%	67	100.0%	599	100.0%
<.02	62.0	66.3	44	29.9*	633	68.3	50.7	26	31.2*	299	51.8
.02-.079	30.1	26.8	48	34.8*	282	26.3	39.0	19	32.1*	219	39.4
.08+	7.8	6.9	45	35.2*	104	5.3	10.3	22	36.7*	81	8.8
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹See Appendix D for method used to estimate BAC levels. BAC levels are reported in grams per deciliter. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.

TABLE 20.Average Estimated Blood Alcohol Concentration (BAC) Level¹ on Most Recent Occasion of Driving within Two Hours of Alcohol Use for Drivers Age 16+ who Drove Following Alcohol Use in the Past Year by Gender and Age, 1996

			Gender
	TOTAL		Males		Females
Age	Unweighted Total	Weighted Mean	Unweighted Total	Weighted Mean	Unweighted Total	Weighted Mean
TOTAL	1822	.026	1156	.024	666	.033
16-20 YRS	204	.087	137	.087	67	.087
21-25 YRS	418	.038	252	.038	166	.039
26-34 YRS	770	.030	468	.027	302	.035
35-49 YRS	357	.018	247	.016	110	.026
50+ YRS	73	.015	52	.012	21	.023*
Note: This table is restricted to people who drove a car or other motor vehicle in the past year. ¹See Appendix D for method used to estimate BAC levels. BAC levels are reported in grams per deciliter. *Denotes low precision. Office of Applied Studies, SAMHSA, National Household Survey on Drug Abuse, 1996.
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This page was last updated on June 16, 2008.

SAMHSA, an agency in the Department of Health and Human Services, is the Federal Government's lead agency for improving the quality and availability of substance abuse prevention, addiction treatment, and mental health services in the United States.

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