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Table GPS-1. Lifetime prevalence of drug use among all adults (aged 15 to 64 years old) in nationwide surveys among the general population [see all tables in this series...]

Part (ii) Survey methods

Country Geographical area	Year	Ref.	Collection method	Original age range	Original sample size	Age range all adults	Sample size all adults	Age range young adults	Sample size young adults
Belgium
Vlaanderen (Brussels excluded)	1994	(1)	Phone	18-65	2259	18-65	2259	18-34
French Community	1996-97	(2)	Phone	18-49	978	18-49	978	18-34	508
French Community	1998-99	(3)	Phone	18-49	1006	18-49	1006	18-34	461
French Community	2000	(4)	Phone	18-49	693	18-49	693	18-34	282
National	2001	(5)	Interview	15-64	9470	15-64	7347	15-34	2758
National	2004	(6)	Interview	All ages	12650	15-64		15-34
Bulgaria
National	2005	(1)	Interview	18-60	1036	18-60	1036	18-34	433
Czech Republic
National	2002	(1)	Interview	18-64	2526	18-64	2526	18-34	1002
National	2004	(2)	Interview	18-64	3526	18-64	3526	18-34	1414
Denmark
National	1990	(1)	Phone	>=16	2000	>=16	2000	16-44
National	1994	(2)	Interview	16-44	2521				2521
National	2000	(3)	Interview	16+	14278	16-64	11825	16-34	4141
National	2005	(4)	Interview	16+	14566	16-64	13310	16-34	3583
Germany
East Germany	1990	(1)	Mail	12-39				12-39
Western Germany	1990	(2)	Mail	12-39	19207			12-39	19207
Old and New Länder	1995	(3)	Mail	18-59	7833	18-59	7833	18-34	3157
Old and New Länder	1997	(4)	Mail	18-59	8019	18-59	8019	18-34	3058
National	2000	(5)	Mail	18-59	8139	18-59	8139	18-34	3107
National	2003	(6)	Mail	18-59	8061	18-59	8061	18-34	3775
Estonia
National	1998	(1)	Mail	18-70	2317	18-64	2317	18-34	804
National	2003	(2)	Mail	15-69	1891	15-64		15-34	646
Ireland
National	1998	(1)	Interview	18+	1000	18-64	826	18-34	318
National	1998	(2)	Mail	18+	6539	18-64		18-34
National	2000	(3)	Interview	18+	1000	18-64	907	18-34	404
National	2002-03	(4)	Interview	15-64	4918	15-64	4918	15-34
Greece
Athens	1993	(1)	Interview	12-64	2103	12-64	2103	18-35
National (except Aegean and Ionian Islands)	1998	(2)	Interview	12-64	3752	15-64	3398	15-34	2014
National (except Aegean and Ionian Islands)	2004	(3)	Interview	12-64	4781	15-64	4351	15-34	2620
Spain
National	1995	(1)	Interview	15+	9984	15-64	8888	15-34	5813
National	1997	(2)	Interview	15-65	12515	15-65	12515	15-34	6898
National	1999	(3)	Interview	15-65	12488	15-64	12234	15-34	6293
National	2001	(4)	Interview	15-64	14113	15-64	14113	15-34	6915
National	2003	(5)	Interview	15-64	12033	15-64	12033	15-34	5357
National	2005-06	(6)	Interview	15-64	27934	15-64	27934	15-34	14699
France
National	1992	(1)	Phone	18-75	2099	15-64	2099	15-34	373
Metropolitan France	1995	(2)	Phone	18-75	1993	18-75	1787		756
National	1999	(3)	Phone	15-75	2002	18-69	1742	18-34	753
National	2000	(4)	Phone	12-75	13685	15-64	11317	15-34	4749
Metropolitan France	2002	(5)	Phone	15-75	2009	15-64	1744	15-34	724
National	2005	(6)	Phone	12-75	30514	15-64	25879	15-34	10855
Italy
National	2001	(1)	Mail	15-44	6032	15-44	6032	15-34	3698
National	2003	(2)	Mail	15-54	11869	15-54	11869	15-34	5231
National	2005	(3)	Mail	15-64	27995	15-64	27995	15-34	16552
Cyprus
National	2006	(1)	Interview	15-64	3504	15-64	3504	15-34	1753
Latvia
National	2003	(1)	Interview	15-64	4534	15-64	4534	15-34
Lithuania
National	2004	(1)	Interview	15-64	4207	15-64	4207	15-34	1814
Luxembourg
National	1998	(1)	Interview	12-64	667	15-64		15-34
Hungary
National	2001	(1)	Interview	18-65	2359	18-65	2359	18-34	790
National	2003	(2)	Interview	18-54	3675	18-54		18-34	2319
Malta
National	2001	(1)	Interview	18-64		18-64
Netherlands
National	1997-98	(1)	Interview	12+	22000	15-64	17590	15-34	9090
National	2001	(2)	Interview	12+		15-64	2312	15-34
National	2005	(3)	Interview	15-64	4516	15-64	4516	15-34
Austria
National	2004	(1)	Interview	14-100	4547	15-64	3980	15-34	1754
Poland
National	2002	(1)	Interview	16+	3148	16-64		16-34
Portugal
National	2001	(1)	Interview	15-64	14186	15-64	14186	15-34	6406
Romania
National	2004	(1)	Interview	15-64		15-64		15-34
Slovakia
National	2002	(1)	Interview	18+		18-64	1405	18-34
National	2004	(2)	Interview	15-64	1315	15-64	1315	15-34	578
Finland
National	1992	(1)	Mail	18-74	3457	18-74	3457	18-34
National	1996	(2)	Mail	16-74	3009	16-74	3009	16-34
National	1998	(3)	Mail	15-69	2568	15-69	2568	15-34	974
National	2000	(4)	Interview	15-69	1789	15-64	1677	15-34	615
National	2002	(5)	Mail	15-69	2541	15-64	2377	15-34	1240
National	2004	(6)	Mail	15-69	2526	15-64	2352	15-34	1031
Sweden
National	1994	(1)	Interview	16-75	933	16-64	806	16-34	310
National	1996	(2)	Interview	16-75	1351	16-64	1136	16-34	476
National	1998	(3)	Interview	16-75	1557	16-64	1359	16-34	542
National	2000	(4)	Interview	16-75	2027	16-64	1750	16-34	575
National	2004	(5)	Mail	18-84	12166	18-64	9514	18-34	2985
National	2005	(6)	Mail	16-84	40002	16-64	30538	16-34	9522
National	2006	(7)	Mail	16-84	56889	16-64	41701	16-34	14408
United Kingdom
England and Wales	1994	(1)	Interview	16-59	9645	16-59	9645	16-34	4329
England and Wales	1996	(2)	Interview	16-59	10935	16-59	10935	16-34	4720
England and Wales	1998	(3)	Interview	16-59	9984	16-59	9984	16-34	4112
England and Wales	2000	(4)	Interview	16-59	13018	16-59	13018	16-34	4910
England and Wales	2001-02	(5)	Interview	16-59	20165	16-59	20165	16-34	9006
England and Wales	2002-03	(6)	Interview	16-59	23586	16-59	23586	16-34	9826
England and Wales	2003-04	(7)	Interview	16-59	24422	16-59	24422	16-34	10922
England and Wales	2004-05	(8)	Interview	16-59	28509	16-59	28509	16-34	12630
England and Wales	2005-06	(9)	Interview	16-59	29748	16-59	29748	16-34	12329
Northern Ireland	2002-03	(10)	Interview	15-64	3516	15-64	3516	15-34
Scotland	2003	(11)	Interview	16+	4665	16-64	3506	16-34	1193
Scotland	2004	(12)	Interview	16+	4424	16-64	3293	16-34	978
United Kingdom	2004	(13)	Interview					16-34
Norway
National	1999	(1)	Interview	15+	2170	15-64	1803	15-34	794
National	2004	(2)	Interview	15+	3191	15-64	2669	15-34	1238

Notes:

This table aims to present an overview of national surveys. Exceptionally, some relevant regional surveys are presented. Some city surveys reported by countries were not included as they tend to produce higher prevalence estimates which are not comparable with estimates for whole countries (or large regions with both urban and rural areas). Athens was included as a reference point for the 1993 survey.

'Data collection' means 'data collection method used in the survey': 'interview' (face-to-face interview, which may include self-completed sections for the more sensitive questions, also it may include CAPI - computer assisted interviews), 'phone' (telephone interview), 'mail' (mailed questionnaire), 'Multimethod' (Multi-Method - simultaneous use of interview, mail or internet in the same survey).

'Survey sample' refers to the number of actual respondents to the survey (Net sample). In some cases, national surveys cover originally a broader age range ('original age range') than that presented here for the standard groups 'All adults' (15-64) and 'Young adults' (15-34). Sample sizes are presented respectively for the 'original age range', the 'all adults' and 'young adults' groups.

In surveys with small sample sizes results should be interpreted with caution.

Countries were asked to report results using, as far as possible, EMCDDA standard age groups (all adults: 15-64, young adults: 15-34). In countries where age ranges are more restrictive, prevalence estimates may tend to be slightly higher. Some countries have recalculated their prevalence figures using the EMCDDA standard age groups.

For methods and definitions on population surveys in general, see General population surveys of drug use – methods and definitions.

See also 'General notes for interpreting data' on the Explanatory notes and help page.

Sources:

See Table GPS-0.

For more details on methodological features for each survey, see Table GPS-20.