1Organisation for Economic Co-operation and Development. Addressing Problematic Opioid Use in OECD Countries. OECD Health Policy Studies, OECD Publishing, 2019.
2Mattick, RP, Breen, C, Kimber, J, Davoli, M. Methadone maintenance therapy versus no opioid replacement therapy for opioid dependence. Cochrane Database Syst Rev 2009; 8: CD002209.
3Nielsen, S, Larance, B, Degenhardt, L, Gowing, L, Kehler, C, Lintzeris, N. Opioid agonist treatment for pharmaceutical opioid dependent people. Cochrane Database Syst Rev 2016; 9: CD011117.
4Mancino, M, Curran, G, Han, C, Allee, E, Humphreys, K, Booth, BM. Predictors of attrition from a national sample of methadone maintenance patients. Am J Drug Alcohol Abuse 2010; 36: 155–60.
5Rosic, T, Naji, L, Bawor, M, Dennis, BB, Plater, C, Marsh, DC, et al. The impact of comorbid psychiatric disorders on methadone maintenance treatment in opioid use disorder: a prospective cohort study. Neuropsychiatr Dis Treat 2017; 13: 1399–408.
6Rounsaville, BJ, Weissman, MM, Crits-Christoph, K, Wilber, C, Kleber, H. Diagnosis and symptoms of depression in opiate addicts. Course and relationship to treatment outcome. Arch Gen Psychiatry 1982; 39: 151–6.
7Peles, E, Schreiber, S, Adelson, M. Factors predicting retention in treatment: 10-year experience of a methadone maintenance treatment (MMT) clinic in Israel. Drug Alcohol Depend 2006; 82: 211–7.
8Huang, CL, Lee, CW. Factors associated with mortality among heroin users after seeking treatment with methadone: a population-based cohort study in Taiwan. J Subst Abuse Treat 2013; 44: 295–300.
9Regier, DA, Farmer, ME, Rae, DS, Locke, BZ, Keith, SJ, Judd, LL, et al. Comorbidity of mental disorders with alcohol and other drug abuse. Results from the Epidemiologic Catchment Area (ECA) Study. JAMA 1990; 264: 2511–8.
10Kessler, RC, Nelson, CB, McGonagle, KA, Edlund, MJ, Frank, RG, Leaf, PJ. The epidemiology of co-occurring addictive and mental disorders: implications for prevention and service utilization. Am J Orthopsychiatry 1996; 66: 17–31.
11Kadden, RM, Kranzler, HR, Rounsaville, BS. Validity of the distinction between substance-induced and independent depression and anxiety disorders. Am J Addict 1995; 4: 107–117.
12Schuckit, MA. Comorbidity between substance use disorders and psychiatric conditions. Addiction 2006; 101 (Suppl 1): 76–88.
13Quello, SB, Brady, KT, Sonne, SC. Mood disorders and substance use disorder: a complex comorbidity. Sci Pract Perspect 2005; 3: 13–21.
14Dennis, BB, Roshanov, PS, Naji, L, Bawor, M, Paul, J, Plater, C, et al. Opioid substitution and antagonist therapy trials exclude the common addiction patient: a systematic review and analysis of eligibility criteria. Trials 2015; 16: 475.
15Davidson, L, White, W. The concept of recovery as an organizing principle for integrating mental health and addiction services. J Behav Health Serv Res 2007; 34: 109–20.
16Samaan, Z, Bawor, M, Dennis, BB, Plater, C, Varenbut, M, Daiter, J, et al. Genetic influence on methadone treatment outcomes in patients undergoing methadone maintenance treatment for opioid addiction: a pilot study. Neuropsychiatr Dis Treat 2014; 10: 1503–8.
17American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders (4th edn, revised) (DSM-IV-TR). American Psychiatric Publishing, 2000.
18American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders (5th edn) (DSM-5). American Psychiatric Publishing, 2013.
19Elm, Ev, Altman, DG, Egger, M, Pocock, SJ, Gøtzsche, PC, Vandenbroucke, JP, et al. Strengthening the reporting of observational studies in epidemiology (STROBE) statement: guidelines for reporting observational studies. BMJ 2007; 335: 806–8.
20Marsden, J, Gossop, M, Stewart, D, Best, D, Farrell, M, Lehmann, P, et al. The Maudsley Addiction Profile (MAP): a brief instrument for assessing treatment outcome. Addiction 1998; 93: 1857–68.
21Derogatis, LR. BSI Brief Symptom Inventory: Administration, Scoring, and Procedures Manual (4th edn). National Computer Systems, 1993.
22Derogatis, LR. SCL-90-R: Administration, Scoring of Procedures Manual-II for the Revised Version and Other Instruments of the Psychopathology Rating Scale Series. Clinical Psychometric Research Incorporated, 1992.
23Harris, PA, Taylor, R, Thielke, R, Payne, J, Gonzalez, N, Conde, JG. Research electronic data capture (REDCap) – a metadata-driven methodology and workflow process for providing translational research informatics support. J Biomed Inform 2009; 42: 377–81.
24Harris, PA, Taylor, R, Minor, BL, Elliott, V, Fernandez, M, O'Neal, L, et al. The REDCap consortium: building an international community of software partners. J Biomed Inform 2019; 95: 103208.
25Sheehan, DV, Lecrubier, Y, Sheehan, KH, Amorim, P, Janavs, J, Weiller, E, et al. The Mini-International Neuropsychiatric Interview (M.I.N.I.): the development and validation of a structured diagnostic psychiatric interview for DSM-IV and ICD-10. J Clin Psychiatry 1998; 59 (suppl 20): 22–33. quiz 34–57.
27StataCorp. Stata Statistical Software: Release 15. StataCorp, 2017.
28Lyness, JM, Cox, C, Curry, J, Conwell, Y, King, DA, Caine, ED. Older age and the underreporting of depressive symptoms. J Am Geriatr Soc 1995; 43: 216–21.
29Eaton, NR, Keyes, KM, Krueger, RF, Balsis, S, Skodol, AE, Markon, KE, et al. An invariant dimensional liability model of gender differences in mental disorder prevalence: evidence from a national sample. J Abnorm Psychol 2012; 121: 282–8.
30Simon, RW. Revisiting the relationships among gender, marital status, and mental health. AJS 2002; 107: 1065–96.
31Paul, KI, Moser, K. Unemployment impairs mental health: meta-analyses. J Vocat Beh 2009; 74: 264–82.
32Peduzzi, P, Concato, J, Kemper, E, Holford, TR, Feinstein, AR. A simulation study of the number of events per variable in logistic regression analysis. J Clin Epidemiol 1996; 49: 1373–9.
33Fingleton, N, Matheson, C, Jaffray, M. Changes in mental health during opiate replacement therapy: a systematic review. Drugs Educ Prev Policy 2015; 22: 1–18.
34Collins, R, Boggs, B, Taggart, N, Kelly, M, Drillington, A, Swanton, I, et al. Efficacy of treatment in an opioid –dependent population group using the Maudsley Addiction Profile (MAP) tool. Ulster Med J 2009; 78: 21–5.
35Comiskey, CM. A 3year national longitudinal study comparing drug treatment outcomes for opioid users with and without children in their custodial care at intake. J Subst Abuse Treat 2013; 44: 90–6.
36Comiskey, CM, Cox, G. Analysis of the impact of treatment setting on outcomes from methadone treatment. J Subst Abuse Treat 2010; 39: 195–201.
37Robertson, JR, Raab, GM, Bruce, M, McKenzie, JS, Storkey, HR, Salter, A. Addressing the efficacy of dihydrocodeine versus methadone as an alternative maintenance treatment for opiate dependence: a randomized controlled trial. Addiction 2006; 101: 1752–9.
38Hallgren, KA, Ries, RK, Atkins, DC, Bumgardner, K, Roy-Byrne, P. Prediction of suicide ideation and attempt among substance-using patients in primary care. J Am Board Fam Med 2017; 30: 150–60.
39Bohnert, AS, Ilgen, MA. Understanding links among opioid use, overdose, and suicide. NEJM 2019; 380: 71–9.
40Rockett, IRH, Caine, ED, Connery, HS, D'Onofrio, G, Gunnell, DJ, Miller, TR, et al. Discerning suicide in drug intoxication deaths: paucity and primacy of suicide notes and psychiatric history. PLoS One 2018; 13: e0190200.
41Barber, CW, Miller, MJ. Reducing a suicidal person's access to lethal means of suicide: a research agenda. Am J Prev Med 2014; 47 (Suppl): 264–72.