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Rammohan I, Jain S, Sun S, Marks C, Milloy MJ, Hayashi K, DeBeck K, González-Zúñiga P, Strathdee S, Werb D. Latent polydrug use patterns and the provision of injection initiation assistance among people who inject drugs in three North American settings. Drug Alcohol Rev 2023; 42:1504-1516. [PMID: 37321850 PMCID: PMC10524861 DOI: 10.1111/dar.13687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 03/17/2023] [Accepted: 05/05/2023] [Indexed: 06/17/2023]
Abstract
INTRODUCTION We sought to identify latent profiles of polysubstance use patterns among people who inject drugs in three distinct North American settings, and then determine whether profile membership was associated with providing injection initiation assistance to injection-naïve persons. METHODS Cross-sectional data from three linked cohorts in Vancouver, Canada; Tijuana, Mexico; and San Diego, USA were used to conduct separate latent profile analyses based on recent (i.e., past 6 months) injection and non-injection drug use frequency. We then assessed the association between polysubstance use patterns and recent injection initiation assistance provision using logistic regression analyses. RESULTS A 6-class model for Vancouver participants, a 4-class model for Tijuana participants and a 4-class model for San Diego participants were selected based on statistical indices of fit and interpretability. In all settings, at least one profile included high-frequency polysubstance use of crystal methamphetamine and heroin. In Vancouver, several profiles were associated with a greater likelihood of providing recent injection initiation assistance compared to the referent profile (low-frequency use of all drugs) in unadjusted and adjusted analyses, however, the inclusion of latent profile membership in the multivariable model did not significantly improve model fit. DISCUSSION AND CONCLUSIONS We identified commonalities and differences in polysubstance use patterns among people who inject drugs in three settings disproportionately impacted by injection drug use. Our results also suggest that other factors may be of greater priority when tailoring interventions to reduce the incidence of injection initiation. These findings can aid in efforts to identify and support specific higher-risk subpopulations of people who inject drugs.
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Affiliation(s)
- Indhu Rammohan
- Centre on Drug Policy and Evaluation, St. Michael’s Hospital, Toronto, Canada
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Canada
| | - Sonia Jain
- Biostatistics Research Center, Herbert Wertheim School of Public Health and Human Longevity Science, University of California San Diego, La Jolla, United States
| | - Shelly Sun
- Biostatistics Research Center, Herbert Wertheim School of Public Health and Human Longevity Science, University of California San Diego, La Jolla, United States
| | - Charles Marks
- Division of Infectious Diseases and Global Public Health, University of California San Diego, La Jolla, United States
- School of Community Health Sciences, University of Reno, Reno, United States
| | - M-J Milloy
- British Columbia Centre on Substance Use, Vancouver, Canada
| | - Kanna Hayashi
- British Columbia Centre on Substance Use, Vancouver, Canada
| | - Kora DeBeck
- British Columbia Centre on Substance Use, Vancouver, Canada
| | - Patricia González-Zúñiga
- Division of Infectious Diseases and Global Public Health, University of California San Diego, La Jolla, United States
| | - Steffanie Strathdee
- Division of Infectious Diseases and Global Public Health, University of California San Diego, La Jolla, United States
| | - Dan Werb
- Centre on Drug Policy and Evaluation, St. Michael’s Hospital, Toronto, Canada
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Canada
- Division of Infectious Diseases and Global Public Health, University of California San Diego, La Jolla, United States
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Najafi-Ghobadi S, Najafi-Ghobadi K, Tapak L, Aghaei A. Application of data mining techniques and logistic regression to model drug use transition to injection: a case study in drug use treatment centers in Kermanshah Province, Iran. SUBSTANCE ABUSE TREATMENT PREVENTION AND POLICY 2019; 14:55. [PMID: 31831013 PMCID: PMC6909482 DOI: 10.1186/s13011-019-0242-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Accepted: 11/19/2019] [Indexed: 11/10/2022]
Abstract
BACKGROUND Drug injection has been increasing over the past decades all over the world. Hepatitis B and C viruses (HBV and HCV) are two common infections among people who inject drugs (PWID) and more than 60% of new human immunodeficiency virus (HIV) cases are PWID. Thus, investigating risk factors associated with drug use transition to injection is essential and was the aim of this research. METHODS We used a database from drug use treatment centers in Kermanshah Province (Iran) in 2013 that included 2098 records of people who use drugs (PWUD). The information of 29 potential risk factors that are commonly used in the literature on drug use was selected. We employed four classification methods (decision tree, neural network, support vector machine, and logistic regression) to determine factors affecting the decision of PWUD to transition to injection. RESULTS The average specificity of all models was over 84%. Support vector machine produced the highest specificity (0.9). Also, this model showed the highest total accuracy (0.91), sensitivity (0.94), positive likelihood ratio [1] and Kappa (0.94) and the smallest negative likelihood ratio (0). Therefore, important factors according to the support vector machine model were used for further interpretation. CONCLUSIONS Based on the support vector machine model, the use of heroin, cocaine, and hallucinogens were identified as the three most important factors associated with drug use transition injection. The results further indicated that PWUD with the history of prison or using drug due to curiosity and unemployment are at higher risks. Unemployment and unreliable sources of income were other suggested factors of transition in this research.
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Affiliation(s)
- Somayeh Najafi-Ghobadi
- Department of Industrial Engineering, Factually of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.
| | - Khadijeh Najafi-Ghobadi
- Department of Biostatistics, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Lily Tapak
- Department of Biostatistics, School of Public Health, Modeling of Noncommunicable Diseases Research Center, Hamadan University of Medical Sciences, Hamadan, 65175-4171, Iran
| | - Abbas Aghaei
- PhD in Epidemiology, Social Determinants of Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran
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Identification of a Syndemic of Blood-Borne Disease Transmission and Injection Drug Use Initiation at the US-Mexico Border. J Acquir Immune Defic Syndr 2019; 79:559-565. [PMID: 30222661 DOI: 10.1097/qai.0000000000001858] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
BACKGROUND Efforts to prevent injection drug use (IDU) are increasingly focused on the role that people who inject drugs (PWID) play in the assistance with injection initiation. We studied the association between recent (ie, past 6 months) injection-related HIV risk behaviors and injection initiation assistance into IDU among PWID in the US-Mexico border region. SETTING Preventing Injecting by Modifying Existing Responses (PRIMER) is a multicohort study assessing social and structural factors related to injection initiation assistance. This analysis included data collected since 2014 from 2 participating cohorts in San Diego and Tijuana. METHODS Participants were 18 years and older and reported IDU within the month before study enrollment. Logistic regression analyses were conducted to assess the association between recent injection-related HIV risk behaviors (eg, distributive/receptive syringe sharing, dividing drugs in a syringe, and paraphernalia sharing) and recent injection initiation assistance. RESULTS Among 892 participants, 41 (4.6%) reported recently providing injection initiation assistance. In multivariable analysis adjusting for potential confounders, reporting a higher number of injection-related risk behaviors was associated with an increased odds of recently assisting others with injection initiation (adjusted odds ratio per risk behavior: 1.3; 95% confidence interval: 1.0 to 1.6, P = 0.04). CONCLUSIONS PWID who recently engaged in one or more injection-related HIV risk behavior were more likely to assist others in injection initiation. These results stress the syndemic of injection initiation and risk behaviors, which indicates that prevention of injection-related HIV risk behaviors might also reduce the incidence of injection initiation.
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Steinberg J, Kral AH, Sumstine S, Wenger LD, D’Anna L, Bluthenthal RN. Gang Involvement and Drug Use Histories Among People Who Inject Drugs in California: A Retrospective Analysis. JOURNAL OF DRUG ISSUES 2019. [DOI: 10.1177/0022042619853295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We examined whether gang membership history was associated with earlier age of first drug use, first drug injection, and shorter time to injection (TTI) drug use among people who inject drugs (PWID). PWID ( N = 438) were interviewed in California (2011-2013). Surveys addressed demographics, current/former drug use practices, gang membership, and parental drug use. Multivariate analyses were conducted to identify whether gang membership history was associated with age at first drug use, first injection drug use, and TTI. Gang membership was reported by 23% of sample. Gang membership history was associated with earlier ages of first drug use (–1.35 years; 95% confidence interval [CI]= [−0.50, −2.20]), age at first injection (–1.89 years; 95% CI = [0.00, −3.78]), but not TTI. Gang involvement facilitates drug use including earlier age of first injection drug use.
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Mittal ML, Jain S, Sun S, DeBeck K, Milloy MJ, Hayashi K, Hadland SE, Werb D. Opioid agonist treatment and the process of injection drug use initiation. Drug Alcohol Depend 2019; 197:354-360. [PMID: 30922483 PMCID: PMC6719710 DOI: 10.1016/j.drugalcdep.2018.12.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 12/20/2018] [Accepted: 12/22/2018] [Indexed: 11/18/2022]
Abstract
BACKGROUND Opioid agonist treatment (OAT) is an effective biomedical intervention to manage opioid use disorder among persons who inject drugs (PWID). Preliminary evidence suggests that OAT may also disrupt the social communicability of injection drug use (IDU) practices by established PWID. We therefore aim to investigate the association between OAT enrollment and initiating others into IDU among PWID in Vancouver, Canada. METHODS Preventing Injecting by Modifying Existing Responses (PRIMER; NIDA DP2-DA040256-01) is a prospective multi-cohort study seeking to identify structural interventions that reduce the risk that PWID initiate others into IDU. The present analysis was conducted using data from a participating cohort of PWID in Vancouver, Canada, between December 2014 and May 2017. Multivariable logistic regression models were built to assess the association between reporting active (i.e., within the past six months) OAT enrollment and assisting others in injection initiation. A final model was determined using a manual stepwise approach whereby covariates were excluded if their removal altered the coefficient of interest by <5%. RESULTS Participants (n = 1740) were predominantly male (62.3%); 35.1% reported daily injecting (n = 611); 860 (49.4%) reported active OAT enrollment, and 80 (4.6%) reported recently providing injection initiation assistance. In a multivariable model, participants who reported active OAT enrollment had significantly lower odds of recently providing injection initiation assistance (Adjusted Odds Ratio = 0.52, 95% Confidence Interval: 0.31-0.87, P = 0.01). CONCLUSION Results suggest a protective association between OAT and the expansion of IDU practices among vulnerable populations, suggesting its potential use as 'addiction treatment as prevention.'
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Affiliation(s)
- María Luisa Mittal
- Division of Infectious Diseases and Global Public Health, University of California San Diego, La Jolla, CA, USA; School of Medicine, Universidad Xochicalco, Tijuana, Mexico
| | - Sonia Jain
- Department of Family Medicine and Public Health, University of California San Diego, La Jolla, CA, USA
| | - Shelly Sun
- Department of Family Medicine and Public Health, University of California San Diego, La Jolla, CA, USA
| | - Kora DeBeck
- BC Centre on Substance Use, St. Paul's Hospital, Vancouver, Canada
| | - M J Milloy
- BC Centre on Substance Use, St. Paul's Hospital, Vancouver, Canada
| | - Kanna Hayashi
- BC Centre on Substance Use, St. Paul's Hospital, Vancouver, Canada; Faculty of Health Sciences, Simon Fraser University, Burnaby, Canada
| | - Scott E Hadland
- Division of General Pediatrics, Department of Pediatrics, Boston University School of Medicine, Boston, MA, USA; Department of Pediatrics and Grayken Center for Addiction, Boston Medical Center, Boston, MA, USA
| | - Dan Werb
- Division of Infectious Diseases and Global Public Health, University of California San Diego, La Jolla, CA, USA.
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Mittal ML, Guise A, Rafful C, Gonzalez-Zuñiga P, Davidson P, Vashishtha D, Strathdee SA, Werb D. "Another Person Was Going to Do It": The Provision of Injection Drug Use Initiation Assistance in a High-Risk U.S.-Mexico Border Region. Subst Use Misuse 2019; 54:2338-2350. [PMID: 31389282 PMCID: PMC6883155 DOI: 10.1080/10826084.2019.1648514] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Background: Persons who inject drugs (PWID) play a key role in assisting others' initiation into injection drug use (IDU). We aimed to explore the pathways and socio-structural contexts for this phenomenon in Tijuana, Mexico, a border setting marked by a large PWID population with limited access to health and social services. Methods: Preventing Injecting by Modifying Existing Responses (PRIMER) is a multi-cohort study assessing socio-structural factors associated with PWID assisting others into initiating IDU. Semi-structured qualitative interviews in Tijuana included participants ≥18 years old, who reported IDU within the month prior to cohort enrollment and ever initiating others into IDU. Purposive sampling ensured a range of drug use experiences and behaviors related to injection initiation assistance. Thematic analysis was used to develop recurring and significant data categories. Results: Twenty-one participants were interviewed (8 women, 13 men). Broadly, participants considered public injection to increase curiosity about IDU. Many considered transitioning into IDU as inevitable. Emergent themes included providing assistance to mitigate overdose risk and to protect initiates from being taken advantage of by others. Participants described reluctance in engaging in this process. For some, access to resources (e.g., shared drugs or a monetary fee) was a motivator to initiate others. Conclusion: In Tijuana, public injection and a lack of harm reduction services are perceived to fuel the incidence of IDU initiation and to incentivize PWID to assist in injection initiation. IDU prevention efforts should address structural factors driving PWID participation in IDU initiation while including PWID in their development and implementation.
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Affiliation(s)
- Maria L Mittal
- Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California San Diego, La Jolla, CA, USA.,Facultad de Medicina, Universidad Xochicalco, Tijuana, Mexico
| | - Andrew Guise
- Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California San Diego, La Jolla, CA, USA.,Division of Health and Social Care Research, King's College, London, UK
| | - Claudia Rafful
- Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California San Diego, La Jolla, CA, USA.,Centre on Drug Policy Evaluation, St. Michael's Hospital, Toronto, ON, Canada
| | - Patricia Gonzalez-Zuñiga
- Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Peter Davidson
- Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Devesh Vashishtha
- Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Steffanie A Strathdee
- Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Dan Werb
- Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California San Diego, La Jolla, CA, USA.,Centre on Drug Policy Evaluation, St. Michael's Hospital, Toronto, ON, Canada
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Melo JS, Mittal ML, Horyniak D, Strathdee SA, Werb D. Injection Drug Use Trajectories among Migrant Populations: A Narrative Review. Subst Use Misuse 2018; 53:1558-1570. [PMID: 29364762 PMCID: PMC6033671 DOI: 10.1080/10826084.2017.1416404] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Dual epidemics of injection drug use and blood-borne disease, characterized as "syndemics," are present in a range of settings. Behaviors that drive such syndemics are particularly prevalent among mobile drug-using populations, for whom cross-border migration may pose additional risks. OBJECTIVES This narrative review aims to characterize the risk factors for injection drug use initiation associated with migration, employing a risk environment framework and focusing on the San Diego-Tijuana border region as the most dynamic example of these phenomena. METHODS Based on previous literature, we divide migration streams into three classes: intra-urban, internal, and international. We synthesized existing literature on migration and drug use to characterize how mobility and migration drive the initiation of injection drug use, as well as the transmission of hepatitis and HIV, and to delineate how these might be addressed through public health intervention. RESULTS Population mixing between migrants and receiving communities and the consequent transmission of social norms about injection drug use create risk environments for injection drug use initiation. These risk environments have been characterized as a result of local policy environments, injection drug use norms in receiving communities, migration-related stressors, social dislocation, and infringement on the rights of undocumented migrants. CONCLUSION Policies that exacerbate risk environments for migrants may inadvertently contribute to the expansion of epidemics of injection-driven blood-borne disease. Successful interventions that address emerging syndemics in border regions may therefore need to be tailored to migrant populations and distinguish between the vulnerabilities experienced by different migration classes and border settings.
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Affiliation(s)
- Jason S Melo
- a Division of Global Public Health, Department of Medicine , University of California San Diego , La Jolla , California , USA
| | - Maria Luisa Mittal
- a Division of Global Public Health, Department of Medicine , University of California San Diego , La Jolla , California , USA.,b School of Medicine, Universidad Xochicalco , Tijuana , Baja California , Mexico
| | - Danielle Horyniak
- a Division of Global Public Health, Department of Medicine , University of California San Diego , La Jolla , California , USA.,c Centre for Population Health, Burnet Institute , Melbourne , Victoria , Australia.,d School of Public Health and Preventive Medicine, Monash University , Melbourne , Victoria , Australia
| | - Steffanie A Strathdee
- a Division of Global Public Health, Department of Medicine , University of California San Diego , La Jolla , California , USA
| | - Dan Werb
- a Division of Global Public Health, Department of Medicine , University of California San Diego , La Jolla , California , USA.,e Centre for Urban Health Solutions, St. Michael's Hospital , Toronto , Ontario , Canada
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Abstract
Although most people who inject drugs (PWID) report receiving assistance during injection initiation events, little research has focused on risk factors among PWID for providing injection initiation assistance. We therefore sought to determine the influence of non-injection drug use among PWID on their risk to initiate others. We used generalized estimating equation (GEE) models on longitudinal data among a prospective cohort of PWID in Tijuana, Mexico (Proyecto El Cuete IV), while controlling for potential confounders. At baseline, 534 participants provided data on injection initiation assistance. Overall, 14% reported ever initiating others, with 4% reporting this behavior recently (i.e., in the past 6 months). In a multivariable GEE model, recent non-injection drug use was independently associated with providing injection initiation assistance (adjusted odds ratio [AOR] = 2.42, 95% confidence interval [CI] = 1.39-4.20). Further, in subanalyses examining specific drug types, recent non-injection use of cocaine (AOR = 9.31, 95% CI = 3.98-21.78), heroin (AOR = 4.00, 95% CI = 1.88-8.54), and methamphetamine (AOR = 2.03, 95% CI = 1.16-3.55) were all significantly associated with reporting providing injection initiation assistance. Our findings may have important implications for the development of interventional approaches to reduce injection initiation and related harms. Further research is needed to validate findings and inform future approaches to preventing entry into drug injecting.
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Werb D, Bluthenthal RN, Kolla G, Strike C, Kral AH, Uusküla A, Des Jarlais D. Preventing Injection Drug use Initiation: State of the Evidence and Opportunities for the Future. J Urban Health 2018; 95:91-98. [PMID: 28948444 PMCID: PMC5862695 DOI: 10.1007/s11524-017-0192-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Dan Werb
- Division of Global Public Health, Department of Medicine, University of California San Diego School of Medicine, 9500 Gilman Drive, La Jolla, CA, 92093-0507, USA.
| | - R N Bluthenthal
- Division of Health Behavior Research, Institute for Prevention Research, Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - G Kolla
- Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada
| | - C Strike
- Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada
- Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - A H Kral
- Behavioral and Urban Health Program, RTI International, San Francisco, CA, USA
| | - A Uusküla
- Institute of Family Medicine and Public Health, Faculty of Medicine, University of Tartu, Tartu, Estonia
| | - D Des Jarlais
- Edmond de Rothschild Chemical Dependency Institute, Icahn School of Medicine at Mount Sinai, New York City, NY, USA
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Melo J, Garfein R, Hayashi K, Milloy M, DeBeck K, Sun S, Jain S, Strathdee S, Werb D. Do law enforcement interactions reduce the initiation of injection drug use? An investigation in three North American settings. Drug Alcohol Depend 2018; 182:67-73. [PMID: 29169035 PMCID: PMC6219752 DOI: 10.1016/j.drugalcdep.2017.10.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 10/02/2017] [Accepted: 10/04/2017] [Indexed: 11/17/2022]
Abstract
BACKGROUND The prevention of drug injecting is often cited as a justification for the deployment of law enforcement and for the continuation of drug criminalization policies. We sought to characterize the impact of law enforcement interactions on the risk that people who inject drugs (PWID) report assisting others with injection initiation in three North American countries. METHODS Cross-sectional data from PWID participating in cohort studies in three cities (San Diego, USA; Tijuana, Mexico; Vancouver, Canada) were pooled (August 2014-December 2016). The dependent variable was defined as recently (i.e., past six months) providing injection initiation assistance; the primary independent variable was the frequency of recent law enforcement interactions, defined categorically (0 vs. 1 vs. 2-5 vs. ≥6). We employed multivariable logistic regression analyses to assess this relationship while controlling for potential confounders. RESULTS Among 2122 participants, 87 (4.1%) reported recently providing injection initiation assistance, and 802 (37.8%) reported recent law enforcement interactions. Reporting either one or more than five recent interactions with law enforcement was not significantly associated with injection initiation assistance. Reporting 2-5 law enforcement interactions was associated with initiation assistance (Adjusted Odds Ratio=1.74, 95% Confidence Interval: 1.01-3.02). CONCLUSIONS Reporting interactions with law enforcement was not associated with a reduced likelihood that PWID reported initiating others into injection drug use. Instead, we identified a positive association between reporting law enforcement interactions and injection initiation assistance among PWID in multiple settings. These findings raise concerns regarding the effectiveness of drug law enforcement to deter injection drug use initiation.
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Affiliation(s)
- J.S. Melo
- Division of Global Public Health, Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - R.S. Garfein
- Division of Global Public Health, Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - K. Hayashi
- British Columbia Centre on Substance Use, British Columbia Centre for Excellence in HIV/AIDS, St Paul’s Hospital, 608-1081 Burrard Street, Vancouver, BC V6Z1Y6, Canada,Faculty of Health Sciences, Simon Fraser University, Blusson Hall, 8888 University Drive, Burnaby, BC V5A 1S6, Canada
| | - M.J. Milloy
- British Columbia Centre on Substance Use, British Columbia Centre for Excellence in HIV/AIDS, St Paul’s Hospital, 608-1081 Burrard Street, Vancouver, BC V6Z1Y6, Canada,Division of AIDS, Department of Medicine, University of British Columbia, 2329 West Mall, Vancouver, BC V6T 1Z4, Canada
| | - K. DeBeck
- British Columbia Centre on Substance Use, British Columbia Centre for Excellence in HIV/AIDS, St Paul’s Hospital, 608-1081 Burrard Street, Vancouver, BC V6Z1Y6, Canada
| | - S. Sun
- Division of Global Public Health, Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - S. Jain
- Division of Global Public Health, Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - S.A. Strathdee
- Division of Global Public Health, Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - D. Werb
- Division of Global Public Health, Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA,Centre for Urban Health Solutions, St Michael’s Hospital, 30 Bond Street, Toronto, ON M5B 1W8, Canada,Corresponding author at: Division of Global Public Health, University of California San Diego School of Medicine, 9500 Gilman Drive, La Jolla, CA, 92093-0507, USA. (D. Werb)
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Guise A, Horyniak D, Melo J, McNeill R, Werb D. The experience of initiating injection drug use and its social context: a qualitative systematic review and thematic synthesis. Addiction 2017; 112:2098-2111. [PMID: 28734128 PMCID: PMC5673537 DOI: 10.1111/add.13957] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 04/03/2017] [Accepted: 07/14/2017] [Indexed: 02/05/2023]
Abstract
BACKGROUND AND AIM Understanding the experience of initiating injection drug use and its social contexts is crucial to inform efforts to prevent transitions into this mode of drug consumption and support harm reduction. We reviewed and synthesized existing qualitative scientific literature systematically to identify the socio-structural contexts for, and experiences of, the initiation of injection drug use. METHODS We searched six databases (Medline, Embase, PsychINFO, CINAHL, IBSS and SSCI) systematically, along with a manual search, including key journals and subject experts. Peer-reviewed studies were included if they qualitatively explored experiences of or socio-structural contexts for injection drug use initiation. A thematic synthesis approach was used to identify descriptive and analytical themes throughout studies. RESULTS From 1731 initial results, 41 studies reporting data from 1996 participants were included. We developed eight descriptive themes and two analytical (higher-order) themes. The first analytical theme focused on injecting initiation resulting from a social process enabled and constrained by socio-structural factors: social networks and individual interactions, socialization into drug-using identities and choices enabled and constrained by social context all combine to produce processes of injection initiation. The second analytical theme addressed pathways that explore varying meanings attached to injection initiation and how they link to social context: seeking pleasure, responses to increasing tolerance to drugs, securing belonging and identity and coping with pain and trauma. CONCLUSIONS Qualitative research shows that injection drug use initiation has varying and distinct meanings for individuals involved and is a dynamic process shaped by social and structural factors. Interventions should therefore respond to the socio-structural influences on injecting drug use initiation by seeking to modify the contexts for initiation, rather than solely prioritizing the reduction of individual harms through behavior change.
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Affiliation(s)
- Andy Guise
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, 92093, USA,Division of Health and Social Care, King’s College London, Addison House, Guy’s campus, London, UK
| | - Danielle Horyniak
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, 92093, USA,Behaviours and Health Risks Program, Burnet Institute, 85 Commercial Rd, Melbourne VIC 3004, Australia,School of Public Health and Preventive Medicine, Monash University, 99 Commercial Rd, Melbourne VIC 3004, Australia
| | - Jason Melo
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, 92093, USA
| | - Ryan McNeill
- British Columbia Centre on Substance Use, 608-1081 Burrard Street, Vancouver, British Columbia Canada,Division of AIDS, Department of Medicine, University of British Columbia, 2775 Laurel St, Vancouver, British Columbia Canada
| | - Dan Werb
- Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, 92093, USA,International Centre for Science in Drug Policy, St. Michael’s Hospital, 30 Bond St, Toronto, Canada
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Systematic review of universal school-based 'resilience' interventions targeting adolescent tobacco, alcohol or illicit substance use: A meta-analysis. Prev Med 2017; 100:248-268. [PMID: 28390835 DOI: 10.1016/j.ypmed.2017.04.003] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 03/02/2017] [Accepted: 04/02/2017] [Indexed: 01/03/2023]
Abstract
Universal school-based interventions that address adolescent 'resilience' may represent a means of reducing adolescent substance use, however previous systematic reviews have not examined the effectiveness of such an intervention approach. A systematic review was undertaken to 1) assess whether universal school-based 'resilience' interventions are effective in reducing the prevalence of tobacco, alcohol or illicit substance use by adolescents, and 2) describe such effectiveness per intervention characteristic subgroups. Eligible studies were peer-reviewed reports (1994-2015) of randomised controlled trials including participants aged 5-18years that reported adolescent tobacco, alcohol or illicit substance use, and implemented a universal school-based 'resilience' intervention (i.e. those addressing both individual (e.g. self-esteem) and environmental (e.g. school connectedness) protective factors of resilience). Trial effects for binary outcomes were synthesised via meta-analyses and effect sizes reported as odds ratios. Subgroup (by intervention type, prevention approach, setting, intervention duration, follow-up length) and sensitivity analyses (excluding studies at high risk of bias) were conducted. Nineteen eligible studies were identified from 16,619 records (tobacco: n=15, alcohol: n=17, illicit: n=11). An overall intervention effect was found for binary measures of illicit substance use (n=10; OR: 0.78, 95%CI: 0.6-0.93, p=0.007,Tau2=0.0, I2=0%), but not tobacco or alcohol use. A similar result was found when studies assessed as high risk of bias were excluded. Overall intervention effects were evident for illicit substance use within multiple intervention characteristic subgroups, but not tobacco and alcohol. Such results support the implementation of universal school-based interventions that address 'resilience' protective factors to reduce adolescent illicit substance use, however suggest alternate approaches are required for tobacco and alcohol use. PROSPERO registration: CRD42014004906.
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Bluthenthal RN, Wenger L, Chu D, Bourgois P, Kral AH. Drug use generations and patterns of injection drug use: Birth cohort differences among people who inject drugs in Los Angeles and San Francisco, California. Drug Alcohol Depend 2017; 175:210-218. [PMID: 28448905 PMCID: PMC5494991 DOI: 10.1016/j.drugalcdep.2017.04.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 03/24/2017] [Accepted: 04/05/2017] [Indexed: 12/25/2022]
Abstract
OBJECTIVES A robust literature documents generational trends in drug use. We examined the implications of changing national drug use patterns on drug injection histories of diverse people who inject drugs (PWID). METHODS Drug use histories were collected from 776 active PWID in 2011-13. Using descriptive statistics, we examine drug use initiation by year and birth cohort (BC) differences in drug first injected. A multivariate linear regression model of time to injection initiation ([TTII] (year of first injection minus year of first illicit drug use) was developed to explore BC differences. RESULTS The first drug injected by BC changed in tandem with national drug use trends with heroin declining from 77% for the pre-1960's BC to 58% for the 1960's BC before increasing to 71% for the 1990's BC. Multivariate linear regression modeling found that shorter TTII was associated with the 1980's/1990's BC (-3.50 years; 95% Confidence Interval [CI]=-0.79, -6.21) as compared to the 1970's BC. Longer TTII was associated with being female (1.65 years; 95% CI=0.40, 2.90), African American (1.69 years; 95% CI=0.43, 2.95), any substance use treatment prior to injection (4.22 years; 95% CI=2.65, 5.79), and prior non-injection use of drug that was first injected (3.29 years; 95% CI=2.19, 4.40). CONCLUSION National drug trends appear to influence injection drug use patterns. The prescription opiate drug era is associated with shorter TTII. Culturally competent, demographically and generationally-targeted prevention strategies to combat transitions to drug injection are needed to prevent or shorten upstream increases in risky drug use practices on a national level.
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Affiliation(s)
- Ricky N. Bluthenthal
- Department of Preventive Medicine, Institute for Prevention Research, Keck School of Medicine, University of Southern California, 2001 N. Soto Street, Los Angeles, CA, 90033, USA
| | - Lynn Wenger
- Behavioral and Urban Health Program, RTI International, 351 California St., San Francisco, CA 94104, USA
| | - Daniel Chu
- Department of Preventive Medicine, Institute for Prevention Research, Keck School of Medicine, University of Southern California, 2001 N. Soto Street, Los Angeles, CA, 90033, USA
| | - Philippe Bourgois
- Department of Psychiatry and Biobehavioral Sciences, UCLA Center for Social Medicine and the Humanities, Semel Institute, 760 Westwood Plaza, Los Angeles, CA 90095, USA
| | - Alex H. Kral
- Behavioral and Urban Health Program, RTI International, 351 California St., San Francisco, CA 94104, USA
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Syvertsen JL, Paquette CE, Pollini RA. Down in the valley: Trajectories of injection initiation among young injectors in California's Central Valley. THE INTERNATIONAL JOURNAL OF DRUG POLICY 2017; 44:41-49. [PMID: 28458170 DOI: 10.1016/j.drugpo.2017.03.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 01/31/2017] [Accepted: 03/13/2017] [Indexed: 11/17/2022]
Abstract
BACKGROUND Injection drug use initiation represents a critical point of public health intervention, as injection increases risk for blood borne infections including Hepatitis C and HIV. In this paper, we explore pathways to injection initiation among youth (≤30) in the rural context of California's Central Valley, where rates of injection drug use are among the highest in the nation. METHODS We draw on semi-structured qualitative interviews with 20 young injectors to examine drug use histories, including the factors that participants associated with their transition to injection drug use. RESULTS The average age was 24.7 years (range: 20-30), 45% were female (n=9), and 30% were Latino (n=6). Participants described a variety of pathways to injection, culminating in a first injection that involved either opioids (n=12) or methamphetamine (n=8). Among the opioid group, the majority used prescription opioids before transitioning to injection, while a smaller number transitioned to opioid injection from non-opioid recreational drug use. Injectors who first used prescription opioids often described growing up in affluent suburban areas and transitioned to injection with peers, owing to a combination of factors related to individual tolerance, cost, and shifting drug markets. In contrast, methamphetamine initiates grew up in less affluent families with histories of substance use that exposed them to drugs at an early age. Methamphetamine users transitioned from smoking and snorting to injection, often with family members or intimate partners, within broader contexts of social disadvantage and stress. CONCLUSION While much of the focus on young injectors has centred on the current opioid epidemic, our data suggest a need to consider multiple pathways towards injection initiation of different drugs. Targeted interventions addressing the unique injection transition contexts of both opioids and methamphetamine are urgently needed in the Central Valley of California.
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Affiliation(s)
- Jennifer L Syvertsen
- The Ohio State University, Department of Anthropology, 4046 Smith Laboratory, 174 W. 18th Ave., Columbus, OH 43210, USA
| | - Catherine E Paquette
- Pacific Institute for Research and Evaluation, 11720 Beltsville Drive, Suite 900, Beltsville, MD 20705, USA
| | - Robin A Pollini
- Pacific Institute for Research and Evaluation, 11720 Beltsville Drive, Suite 900, Beltsville, MD 20705, USA.
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