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Trends in Detection Rates of Risky Marijuana Use in CO Healthcare Settings. Acknowledgements. SBIRT Colorado is a statewide initiative of the Office of the Governor, funded by SAMHSA, administered by DBH, managed by Peer Assistance Services - PowerPoint PPT Presentation
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Trends in Detection Rates of Risky Marijuana Use in CO Healthcare Settings
Acknowledgements» SBIRT Colorado is a statewide initiative
of the Office of the Governor, funded by SAMHSA, administered by DBH, managed by Peer Assistance Services
» Authors: Melissa Richmond, Katie Page, Laura Rivera, Brie Reimann, Leigh Fischer
» Thanks to: DBH, Peer Assistance, SBIRT team, Dr. Fred Pampel
Introduction» Marijuana Use and Abuse
» 17.4 million users nationwide (2010 NSDUH)
» 32% increase in marijuana treatment admissions 1996-2006 (2009 TEDS)
» 9% of all users and 25-50% of daily users become dependent (NIDA)
» Other consequences
Marijuana Policy» National Marijuana Policy
» 16 states have legalized medical marijuana» States with medical marijuana laws have
higher rates of marijuana use» Colorado Marijuana Policy
» Legalized medical marijuana in 2000» Rapid growth of marijuana industry since
2009» Uses a dispensary system requiring physician
approved medical marijuana cards
Implications of Legislative Changes
» Substance use prevention research: » Availability, price, advertisement, social
norms» Implications for healthcare providers» Opportunities to use data from
prevention and treatment programs to assess changes» Colorado SBIRT
SBIRT Model
Specific Aims1. Examine trends in rates of patients
screening positive in healthcare settings for risk-prone patterns of marijuana use in CO
2. Assess trends in severity of use at time of screening among marijuana users
3. Examine if trends in use or severity of use differ by age and gender
Methods» Participants
» 108,907 patients were screened in 12 healthcare sites (Jan 2008 – August 2011)»Mean age 44.2 years (SD 17.7; range 18-85)»53% Female»59% identified as White, 28.4% as Hispanic,
& 8.7% as Black
SBIRT Colorado
Methods» Procedures & Measures
1. Brief screen questions (tobacco, alcohol, drug use)
2. Health Educator administered ASSIST (WHO)» Prior use and negative consequences “During the
past 3 months, how often has your use of cannabis lead to health, social, legal, or financial problems”
» Scored 0-39» 4+ on cannabis scale = at least moderate risk
3. Any medical marijuana use = ASSIST
Results» 8,748 (8%) patients screened positive
for marijuana» Odds of screening positive accelerating
in early 2009 (interaction with patient age)
Results» Odds of screening positive increased
over time (nonlinear)» Odds of a positive screen were 60%
lower for females than for males» Controlling for time and gender, for
every 10 years older patients were, odds of a positive screen decreased by 38-40%
Results» Severity of Use Among Users (1+ on
the ASSIST)» Linear increase over time» Less severe use with age» Less severe use for females than males» 1.6% of the variance in severity was
explained by the model
Discussion» Increases in positive marijuana screens over
time correspond to changing landscape» Consistent results across 2 scoring methods
» Probability of positive screen increased over time for all individuals
» Young males had highest probability of positive screen
» Older adults» Greater proportional increases at low threshold
(4+ Assist)
Discussion» Severity of use
» Severity of use increased over time» Males > Females» Younger > Older
» Consistent with national trends» Majority of national treatment admissions are
for males & individuals < age 30
Discussion» Healthcare providers likely serving
increasing numbers of patients using marijuana» < 5% of CO physicians authorize medical
marijuana » Lack of rigorous regulations around
manufacture, distribution and dosage» Universal screening: opportunity to intervene
Limitations» Rapid change in marijuana landscape» Multiple factors likely impact increased
marijuana use» SBIRT 2 phase screening process may
have missed marijuana users» Generalizability
Future Directions» Further research on best practices for
healthcare providers
» Universal screening protocols as a way to address risk-prone use
» Continued changes to marijuana policy
OMNI Institute899 Logan Street, Suite 600Denver, CO. 80203
www.OMNI.orgtel: 303.839.9422 or 800.279.2070fax: 303.839.9420
Richmond, M.K., Page, K., Rivera, L.S., Reimann, B., & Fischer, L. (in press). Trends in Detection Rates of Risky Marijuana Use in Colorado Healthcare Settings. Substance Abuse.