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The Community Youth The Community Youth Development Study:Development Study:
Testing Communities That CareTesting Communities That Care
Funded by:National Institute on Drug Abuse
Center for Substance Abuse Prevention National Cancer Institute
National Institute on Child Health and Development
National Institute on Mental Health
The Community Youth The Community Youth Development Study: Project StaffDevelopment Study: Project StaffJ. David Hawkins, Ph.D.J. David Hawkins, Ph.D.Principal Investigator
Richard F. Catalano, Ph.D. Richard F. Catalano, Ph.D. Co-Investigator
Michael W. Arthur, Ph.D. Michael W. Arthur, Ph.D. Co-Investigator
Kevin Haggerty, MSW Kevin Haggerty, MSW Co-Investigator
Rose Quinby, MSWRose Quinby, MSWProject Director
Barb McMorris, Ph.D.Barb McMorris, Ph.D.NL Project Director
Abby Fagan, Ph.D. Abby Fagan, Ph.D. Intervention Specialist
Blair Brooke-Weiss, MPH Blair Brooke-Weiss, MPH Intervention Specialist
Rick CadyRick CadyIntervention Specialist
Robert Abbott, Ph.D.Robert Abbott, Ph.D.Statistical Consultant
David Murray, Ph.D.David Murray, Ph.D.Statistical Consultant
Eric Brown, Ph.D.Eric Brown, Ph.D.Research Analyst
Beth Egan, Ph.D.Beth Egan, Ph.D. Research Analyst
John BrineyJohn Briney Data Manager
Koren Hanson, M.A. Koren Hanson, M.A. Data Manager
Renee PetrieRenee Petrie Data Operations Unit Director
Out of 12 community based Out of 12 community based coalitions, how many produced coalitions, how many produced
positive outcome ofpositive outcome of reduced reduced youth substance use?youth substance use?
0
Berkowitz, 2001; Halfors, 2002
What works?What works?Findings on Findings on
Coalition EffectivenessCoalition EffectivenessHallfors et al., made these recommendations : Hallfors et al., made these recommendations :
1. Clearly defined, focused and manageable 1. Clearly defined, focused and manageable goals & outcomes based on high quality goals & outcomes based on high quality data sources. data sources.
2. Evidence based programs should be 2. Evidence based programs should be encouraged with careful attention to dose encouraged with careful attention to dose and quality. and quality.
3. Evaluation of impact needed. Select 3. Evaluation of impact needed. Select outcomes & goals meaningful to communityoutcomes & goals meaningful to community. .
The CThe Communities That Care ommunities That Care Operating SystemOperating System
Creating Communities
That Care
Get Started
Get Organized
Develop a ProfileCreate a Plan
Implement andEvaluate
The CThe Communities That Care ommunities That Care Operating SystemOperating System
Creating Communities
That Care
Get Started
Get Organized
Develop a ProfileCreate a Plan
Implement andEvaluate
• Community readiness assessment.
• Identification of key individuals, stakeholders,
and organizations.
The CThe Communities That Care ommunities That Care Operating SystemOperating System
Creating Communities
That Care
Get Started
Get Organized
Develop a ProfileCreate a Plan
Implement andEvaluate
• Training key leaders and board in CTC
• Building the community coalition.
The CThe Communities That Care ommunities That Care Operating SystemOperating System
Creating Communities
That Care
Get Started
Get Organized
Develop a ProfileCreate a Plan
Implement andEvaluate
• Collect risk/protective factor and outcome data.
• Construct a community profile
from the data.
The CThe Communities That Care ommunities That Care Operating SystemOperating System
Creating Communities
That Care
Get Started
Get Organized
Develop a ProfileCreate a Plan
Implement andEvaluate
• Define outcomes.•Prioritize risk factors to be
targeted.• Select tested, effective
interventions.• Create action plan.
• Develop evaluation plan.
The CThe Communities That Care ommunities That Care Operating SystemOperating System
Creating Communities
That Care
Get Started
Get Organized
Develop a ProfileCreate a Plan
Implement andEvaluate
• Form task forces.• Identify and train
implementers.• Sustain collaborative
relationships.• Evaluate processes and
outcomes.• Adjust programming.
The Community Youth The Community Youth Development Study Development Study
(CYDS)(CYDS)
A randomized controlled trial to test A randomized controlled trial to test the effects of the Communities that the effects of the Communities that Care system.Care system.
CYDS Primary AimCYDS Primary Aim
To test the effectiveness of the Communities To test the effectiveness of the Communities That Care (CTC) system in reducing levels That Care (CTC) system in reducing levels of risk, increasing levels of protection, and of risk, increasing levels of protection, and reducing health and behavior problems in reducing health and behavior problems in early adolescence.early adolescence.
Study Design
Randomize
5-Year Baseline
1997-2002
Randomized Controlled Trial
2003-2008
98 99 ‘00 ‘01 ‘02
SS SS SS
CKICRD
CKICRD
2003 2004 2005 2006 2007 2008
Control
Intervention
SSSS
SSSS
CKICRD
CKICRD
CKICRD
CKICRD
Panel Panel Panel Panel
Planning
Implement selected interventions
Evaluate
SS
SS
Panel
CTCBoar
d
CTCBoar
d
CTCBoar
d
CTCBoar
d
CTCBoar
d
Panel Panel Panel PanelPanel
Demographics of 24 Study Demographics of 24 Study Communities from 7 States Communities from 7 States
Mean Minimum Maximum
Total Population 14,616 1,578 40,787
Percent Caucasian 89.4% 64.0% 98.2%
Percent Hispanic Origin
Percent African-Amer.
Percent Eligible for Free/Reduced Lunch
9.6%
2.6%
36.5%
0.5%
0.0%
20.6%
64.7%
21.4%
65.9%
1010thth Grade Drug Use Prevalence in CYDS Grade Drug Use Prevalence in CYDS and Monitoring The Future and Monitoring The Future
20022002
CYDS MTF
30-Day Cigarette 20.0 17.7
30-Day Alcohol 38.4 35.4
Binge Drinking 23.5 22.4
30-Day Marijuana 21.5 17.8
CTC ImplementationCTC Implementation
1.1. Training:Training: Six events in each community with Six events in each community with refresher trainings as neededrefresher trainings as needed
2.2. Coordinators:Coordinators: One full time in each community One full time in each community3.3. CTC Manuals:CTC Manuals: For each phase training; For each phase training;
Milestones & Benchmarks are includedMilestones & Benchmarks are included..4.4. Technical Assistance – Technical Assistance – SDRG intervention SDRG intervention
specialist weekly calls to specialist weekly calls to 5.5. ResourcesResources - - To implement To implement selected tested, effective programs --$75,000 selected tested, effective programs --$75,000
per for each communityper for each community
CYDS Progress: What are CYDS Progress: What are interim signs of success?interim signs of success?
1.1. High fidelity implementation High fidelity implementation a. The CTC system a. The CTC system b. Prevention programs that are proven to workb. Prevention programs that are proven to work
2.2. Results from participant evaluations Results from participant evaluations moving in the expected directionmoving in the expected direction
3.3. Fair to good exposure to programs Fair to good exposure to programs (Goal: involve a substantial proportion of (Goal: involve a substantial proportion of target populations so we’ll see target populations so we’ll see community-wide effects)community-wide effects)
CYDS Progress: What are CYDS Progress: What are interim signs of success?interim signs of success?
1.1. High fidelity implementation High fidelity implementation a. The CTC systema. The CTC system b. Prevention programs that are proven to workb. Prevention programs that are proven to work
2.2. Results from participant evaluations Results from participant evaluations moving in the expected directionmoving in the expected direction
3.3. Fair to good exposure to programs Fair to good exposure to programs (Goal: involve a substantial proportion of (Goal: involve a substantial proportion of target populations so we’ll see target populations so we’ll see community-wide effects)community-wide effects)
Implementation FidelityImplementation Fidelity
What is ‘implementation fidelity’? What is ‘implementation fidelity’? Replicating programs with integrity to their Replicating programs with integrity to their
core components and theoretical framework.core components and theoretical framework. Why is it important?Why is it important?
Verifies that the selected program is, in fact, Verifies that the selected program is, in fact, being implementedbeing implemented
Increases the likelihood of achieving the Increases the likelihood of achieving the results found in the original evaluations.results found in the original evaluations.
Implementing CTC with FidelityImplementing CTC with Fidelity
Assessed as the proportion of achieved CTC Assessed as the proportion of achieved CTC Milestones and Benchmarks (goals, steps, Milestones and Benchmarks (goals, steps, actions, and conditions)actions, and conditions)
Phase 1: Getting StartedPhase 1: Getting Started Milestone: The community is ready to begin CTCMilestone: The community is ready to begin CTC
Benchmark: A Key Leader “Champion” has been identified Benchmark: A Key Leader “Champion” has been identified to guide the CTC processto guide the CTC process
Phase 2: Getting OrganizedPhase 2: Getting Organized Milestone: Key Leaders have been engagedMilestone: Key Leaders have been engaged
Benchmark: A Key Leader Orientation has been held Benchmark: A Key Leader Orientation has been held
CTC Implementation FidelityCTC Implementation Fidelity
Conclusion: CTC implementation during the first 18 months of CYDS was very high
PhasePhase % of Milestones Completed % of Milestones Completed
Across Communities & RatersAcross Communities & Raters 1—Getting Started1—Getting Started 91.5%91.5%
2—Organizing, Introducing, 2—Organizing, Introducing,
Involving.Involving. 99%99%
3—Developing a community 3—Developing a community profileprofile
100%100%
4—Creating a community 4—Creating a community Action Plan Action Plan
98.5%98.5%
Community ratings on Community ratings on four most difficult (challenging) four most difficult (challenging)
milestonesmilestones
Milestone/ Benchmark
% Rating Milestone as
“Mostly” or “Very Challenging”*
Average Challenge Score
(1 = high challenge)
Average Implementation
Score (1 = high
implementation)
1.4 Community readiness issues have been analyzed and either addressed, or a plan for addressing them has been developed. 58.3% 1.86 2.07
1.43 An action plan for addressing outstanding readiness issues has been developed 83.3% 1.70 2.10
3.2 Community assessment information has been collected and prepared for prioritization. 2.00 1.00
3.23 CTC Youth Survey and archival data has been prepared for prioritization
50.0% 1.83 1.00
4.1 The Community Board has the capacity to create a focused community action plan. 1.60 1.73
4.12 All stakeholders whose support is required have been engaged
83.3% 1.60 2.30
4.4 Implementation plans for each program, policy or practice to be implemented have been developed. 50.0% 1.92 1.13
4.43 Resources required to implement each new program, policy or practice have been identified 66.6% 1.75 1.38
Community Board InterviewCommunity Board Interview
What is it? – A yearly interview with a What is it? – A yearly interview with a sample of 15-20 Board members.sample of 15-20 Board members.
Main goal of 2005 interview: Main goal of 2005 interview: to learn more to learn more about internal operation and efficiency of about internal operation and efficiency of the Board--the Board--
Your Board development plan is based in Your Board development plan is based in part on this data.part on this data.
CTC Community BoardsCTC Community BoardsA
vera
ge
Sc
ore
on
1-4
Sc
ale
CTC Board Functioning
3.2
3.5
3.2 3.2
3.4 3.4
3.1
3.8
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Board Directedness Board Cohesion Board Efficiency Board Conflict Resolution
Community Y 2004 Community Y 2005 All 12 Communities 2005
CTC Community BoardsCTC Community BoardsA
vera
ge
Sc
ore
on
1-4
Sc
ale
Level of Community Involvement in CTC
2.3
1.8
2.8
3.3
2.2
2.7
3.1
2.2
1.9
1.5
3.1
2.7
2.4
1.9
2.9
2.7 2.7
2.22.2
2.9
2.12.2
2.6
1.6
2.7
3.3
1.0
1.5
2.0
2.5
3.0
3.5
4.0
ElectedCommunity
Leaders
Parents Teachers andStaff
School DistrictAdmin
Social ServiceProviders
Students BusinessLeaders
FaithCommunity
Leaders
LawEnforcement
MediaRepresentatives
RecreationOfficials
CommunityVolunteers
OtherCommunityMembers
Port Angeles 2004 Port Angeles 2005 Combined Communities
Perceived Impact of CTC in the Perceived Impact of CTC in the CommunityCommunity
4.1
3.43.9 3.9 4.03.94.1 4.1
1
2
3
4
5
Quality of local programs Level of systematic andcomprehensive school-community planning
Extent to which the schooland community partners
work together oncollaborative projects
Well-being of people in ourcommunity
Aver
age o
n sc
ale o
f 1 (A
Lot
Wor
se) t
o 5
(A L
ot B
ette
r)
.
Community X compared to all 12 communities (shown by the dot)
Perceived Barriers to CTC Perceived Barriers to CTC ImplementationImplementation
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
60.0% XXX 2005
XXX 2004
All communities
CYDS Progress: What are CYDS Progress: What are interim signs of success?interim signs of success?
1.1. High fidelity implementationHigh fidelity implementation a. The CTC system a. The CTC system b. b. Prevention programs that are proven to workPrevention programs that are proven to work
2.2. Results from participant evaluations Results from participant evaluations moving in the expected directionmoving in the expected direction
3.3. Fair to good exposure to programs Fair to good exposure to programs (Goal: involve a substantial proportion of (Goal: involve a substantial proportion of target populations so we’ll see target populations so we’ll see community-wide effects)community-wide effects)
Programs Implemented Programs Implemented July 2004 – June 2005July 2004 – June 2005
PROGRAMPROGRAM COMMUNITYCOMMUNITY CYCLESCYCLES
All Stars Core All Stars Core 11 11
Life Skills TrainingLife Skills Training 22 55 Lion’s-Quest Skills for AdolescenceLion’s-Quest Skills for Adolescence 22 22 Program Development Evaluation TrainingProgram Development Evaluation Training 11 11
Participate and Learn Skills (PALS)Participate and Learn Skills (PALS) 11 33 Big Brothers/Big SistersBig Brothers/Big Sisters 22 22
Stay SMARTStay SMART 33 99
TutoringTutoring 33 1111 Valued Youth Tutoring ProgramValued Youth Tutoring Program 11 33
Strengthening Families 10-14Strengthening Families 10-14 22 1515
Guiding Good ChoicesGuiding Good Choices 66 3838 Parents Who CareParents Who Care 11 33 Family MattersFamily Matters 11 22
We Know Guiding Good We Know Guiding Good Choices® works!Choices® works!
Research trials have shown that Guiding Good Choices: Research trials have shown that Guiding Good Choices: reduces alcohol and marijuana use by 40.6% reduces alcohol and marijuana use by 40.6% reduces progression to more serious substance abuse reduces progression to more serious substance abuse
by 54% by 54% increases the likelihood that non-users will remain increases the likelihood that non-users will remain
drug-free by 26%drug-free by 26% reduces depression symptoms by 28%reduces depression symptoms by 28%
And it’s cost effective!And it’s cost effective! For every dollar spent on GGC, $11.07 is saved in preventable For every dollar spent on GGC, $11.07 is saved in preventable
costs associated with youth substance use and delinquency costs associated with youth substance use and delinquency (Washington State Institute for Public Policy, 2004, (Washington State Institute for Public Policy, 2004, www.wsipp.wa.govwww.wsipp.wa.gov) )
Implementation Fidelity ChecksImplementation Fidelity Checks Obtained/created Obtained/created
monitoring tools monitoring tools Trained all program Trained all program
implementers implementers Required program Required program
implementers to implementers to complete fidelity complete fidelity checklists checklists
Generated progress Generated progress reports for communitiesreports for communities
CYDS Program Fidelity ResultsCYDS Program Fidelity ResultsJuly 2004 – June 2005July 2004 – June 2005
ADHERENCE: extent to which the programs’ critical ADHERENCE: extent to which the programs’ critical elements and content are delivered elements and content are delivered
90% adherence rate across all programs and 90% adherence rate across all programs and
communities communities
Some modifications were reported, most often Some modifications were reported, most often deleting parts of sessions or program activitiesdeleting parts of sessions or program activities
Common challenges included lack of time and Common challenges included lack of time and participant misbehavior participant misbehavior
Adherence Rates Adherence Rates July 2004 – June 2005July 2004 – June 2005
0
10
20
30
40
50
60
70
80
90
100
LST AS SFA PDE SMART Tutor VY BBBS PALS SFP GGC PWC FM
Percentage of material taught and core components achieved
CYDS Program Fidelity ResultsCYDS Program Fidelity ResultsJuly 2004 – June 2005July 2004 – June 2005
DOSAGE: extent to which the required number, DOSAGE: extent to which the required number, length, and frequency of sessions were taughtlength, and frequency of sessions were taught
91% dosage rate across all programs and 91% dosage rate across all programs and communities communities
Full dosage was achieved in 78% of all Full dosage was achieved in 78% of all replications (74 of 95 cycles)replications (74 of 95 cycles)
Deviations in dosage were generally minorDeviations in dosage were generally minor~ e.g., 30 vs. 45-minute sessions e.g., 30 vs. 45-minute sessions ~ e.g., deleting 1 of 12 required sessionse.g., deleting 1 of 12 required sessions
Dosage RatesDosage RatesJuly 2004 – June 2005July 2004 – June 2005
Percentage of program cycles achieving dosage requirements
0
10
20
30
40
50
60
70
80
90
100
LST AS SFA PDE SMART Tutor VY BBBS PALS SFP GGC PWC FM
CYDS Progress: What are CYDS Progress: What are interim signs of success?interim signs of success?
1.1. High fidelity implementation High fidelity implementation a. The CTC system a. The CTC system b. Prevention programs that are proven to workb. Prevention programs that are proven to work
2.2. Results from participant evaluations Results from participant evaluations moving in the expected directionmoving in the expected direction
3.3. Fair to good exposure to programs Fair to good exposure to programs (Goal: involve a substantial proportion of (Goal: involve a substantial proportion of target populations so we’ll see target populations so we’ll see community-wide effects)community-wide effects)
Participant Survey ResultsParticipant Survey ResultsSelected Parent Survey Results (n=47) from GGC in
Community C All questions on scale of 1 (strongly disagree) to 7 (strongly agree)
ItemItemPre-survey Pre-survey Mean ScoreMean Score
Post-Post-survey survey
Mean ScoreMean ScoreChangeChange
Children who are bonded to Children who are bonded to their families are less likely to their families are less likely to use drugsuse drugs
5.85.8 6.36.3 +0.5*+0.5*
Children should be involved in Children should be involved in deciding what the family rules deciding what the family rules will bewill be
5.05.0 5.85.8 +0.8*+0.8*
Part of learning to say “no” to Part of learning to say “no” to drugs is to suggest something drugs is to suggest something different to do with friendsdifferent to do with friends
5.75.7 6.46.4 +0.7*+0.7*
It’s important for family It’s important for family members to practice new skills members to practice new skills together even if it makes them together even if it makes them uncomfortable at firstuncomfortable at first
5.95.9 6.36.3 +0.4*+0.4*
* Indicates statistically significant change (p<.05) from pre-survey to post-survey
CYDS Progress: What are CYDS Progress: What are interim signs of success?interim signs of success?
1.1. High fidelity implementation High fidelity implementation a. The CTC system a. The CTC system b. Prevention programs that are proven to workb. Prevention programs that are proven to work
2.2. Results from participant evaluations Results from participant evaluations moving in the expected directionmoving in the expected direction
3.3. Fair to good exposure to programs Fair to good exposure to programs (Goal: involve a substantial proportion of (Goal: involve a substantial proportion of target populations so we’ll see target populations so we’ll see community-wide effects)community-wide effects)
Participant Attendance Participant Attendance and Retention in the CYDSand Retention in the CYDS
July 2004 – June 2005July 2004 – June 2005
Program TypeProgram Type Total N Served Total N Served
% of Target % of Target PopulationPopulation
% Attending % Attending Majority of Majority of SessionsSessions++
School Curricula School Curricula 14321432 97 (75-100)%97 (75-100)% 96%96%
After-schoolAfter-school** 546546 17 (7-98)%17 (7-98)% 77%77%
Parent TrainingParent Training 517517 8 (3-28)%8 (3-28)% 79%79%
+Attending at least 60% of the total number of sessions*Includes PALS, BBBS, Stay SMART, and Tutoring programs
Parent Training ProgramsParent Training ProgramsPercent of Recruitment Goal ReachedPercent of Recruitment Goal Reached
0
10
20
30
40
50
60
70
80
90
100
H Q T G O C X W W A
GoalAttended
% of target pop
Strengthening Families
Guiding Good Choices PWC Family Matters
Summary of ResultsSummary of Results
13 different prevention programs 13 different prevention programs implemented in 12 communities implemented in 12 communities
Strong implementation fidelityStrong implementation fidelity Preliminary evidence of desired effects on Preliminary evidence of desired effects on
participantsparticipants Stronger growth in collaboration in CTC Stronger growth in collaboration in CTC
communitiescommunities Modest and growing exposure to the Modest and growing exposure to the
programsprograms
Where are we now?—Where are we now?—Update Update
All twelve CTC communities have completed All twelve CTC communities have completed the CTC planning process and developed the CTC planning process and developed community action plans.community action plans.
All twelve CTC communities will are in the All twelve CTC communities will are in the second year of implementing tested, effective second year of implementing tested, effective programs (2005-06). programs (2005-06).
2006 2006 studentstudent surveys will be conducted. surveys will be conducted. 2006 2006 CTC BoardCTC Board surveys will be conducted. surveys will be conducted. 2007 interviews with 2007 interviews with community memberscommunity members are are
complete.complete.
Preventing Adolescent Preventing Adolescent Cannabis Use in the Cannabis Use in the
Netherlands and the U.S.:Netherlands and the U.S.:A Binational Investigation of the A Binational Investigation of the
Communities That Care Communities That Care Prevention SystemPrevention System
J. David Hawkins, Ph.D. J.C.J. Boutellier, Ph.D.
University of Washington Verwey-Jonker Institute
Funded by ZonMw and NIDA
Drug Policy OrientationDrug Policy Orientation
U.S. goal: Use reductionU.S. goal: Use reduction Abstinence messages, any use is abuseAbstinence messages, any use is abuse Zero-toleranceZero-tolerance
The Netherlands goal: Harm reductionThe Netherlands goal: Harm reduction- Combination of abstinence and harm - Combination of abstinence and harm
reduction messagesreduction messages- Accepts normative experimentation as a Accepts normative experimentation as a
realityreality- Distinguishes between soft and hard drugs, Distinguishes between soft and hard drugs,
and possession/use vs. dealing/production and possession/use vs. dealing/production
Aims of the Binational CollaborationAims of the Binational Collaboration
1.1. To compare the prevalence and To compare the prevalence and predictors of cannabis use and illicit drug predictors of cannabis use and illicit drug use across samples of young people use across samples of young people from the U.S. and the Netherlands:from the U.S. and the Netherlands:
a. Are there differences in prevalence rates a. Are there differences in prevalence rates from self reports on equivalent instruments?from self reports on equivalent instruments?
b. Are relationships between risk/protective b. Are relationships between risk/protective factors and cannabis the same?factors and cannabis the same?
Aims of the Binational CollaborationAims of the Binational Collaboration
2. To examine the implementation and 2. To examine the implementation and effectiveness of the CTC approach effectiveness of the CTC approach across two nations with different policies across two nations with different policies and cultures:and cultures:
a. What are unique and common barriers to a. What are unique and common barriers to the use of the CTC strategy? What is the use of the CTC strategy? What is sensitive to context? sensitive to context?
United StatesUnited States
20022002 20042004
Drug Use RatesDrug Use Rates age 15-16age 15-16 age 15-16age 15-16
(n = 4,997)(n = 4,997) (n = 4,585)(n = 4,585)
Alcohol -Ever use Alcohol -Ever use 64.3%64.3% 64.6%64.6% -Past month use-Past month use 38.0%38.0% 39.2%39.2%
Cigarettes -Ever smoke Cigarettes -Ever smoke 48.5%48.5% 43.2%43.2%-Past month smoke-Past month smoke 20.7%20.7% 17.6%17.6%
Ecstasy -Ever use Ecstasy -Ever use 9.2%9.2% 5.5%5.5% -Past month use-Past month use 5.4%5.4% 2.2%2.2%
““Hard drugs” -Ever useHard drugs” -Ever use 10.9%10.9% 9.3%9.3% -Past month use-Past month use 6.3%6.3% 4.1%4.1%
Comparing Student Drug UseComparing Student Drug Use
The The NetherlandsNetherlands
2003-052003-05
age 15-16age 15-16
(n = 4,768)(n = 4,768)
86.8%86.8%
70.9%70.9%
54.1%54.1%
27.8%27.8%
3.3%3.3%
1.7%1.7%
3.0%3.0%
1.6%1.6%
United StatesUnited States
20022002 20042004
Cannabis Use Cannabis Use RatesRates
age 15-16age 15-16 age 15-16age 15-16
(n = 4,997)(n = 4,997) (n = 4,585)(n = 4,585)
Marijuana -Ever use Marijuana -Ever use 39.6%39.6% 36.7%36.7% -Past month use-Past month use 21.5%21.5% 19.3%19.3%
Frequency of marijuana Frequency of marijuana use in the past monthuse in the past month
0 times0 times 78.5%78.5% 80.7%80.7%1-2 times1-2 times 6.6%6.6% 7.5%7.5%3-5 times3-5 times 3.1%3.1% 3.3%3.3%6-9 times6-9 times 2.6%2.6% 2.3%2.3%
10 or more times10 or more times 9.2%9.2% 6.2%6.2%
Comparing Student Drug UseComparing Student Drug UseThe The
NetherlandsNetherlands
2003-052003-05
age 15-16age 15-16
(n = 4,768)(n = 4,768)
28.4%28.4%
15.4%15.4%
84.6%84.6%
7.6%7.6%
2.7%2.7%
1.0%1.0%
4.1%4.1%