title: Predictors of time to relapse in amphetamine-type substance users in the matrix treatment program in Iran: a Cox proportional hazard model application.
abstract: The aim of this study was to determine which predictors influence the risk of relapse among a cohort of amphetamine-type substance (ATS) users in Iran.
  
  
  
  A Cox proportional hazards model was conducted to determine factors associated with the relapse time in the Matrix treatment program provided by the Iranian National Center of Addiction Studies (INCAS) between March 2010 and October 2011.
  
  
  
  Participating in more treatment sessions was associated with a lower probability of relapse. On the other hand, patients with less family support, longer dependence on ATS, and those with an experience of casual sex and a history of criminal offenses were more likely to relapse.
  
  
  
  This study broadens our understanding of factors influencing the risk of relapse in ATS use among an Iranian sample. The findings can guide practitioners during the treatment program.
authors.affiliation: Health Management and Economics Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.|Iranian National Center for Addiction Studies (INCAS), Tehran University of Medical Science (TUMS), Tehran, Iran.
authors.forename: Maryam
authors.initials: M
authors.lastname: Moeeni
authors.affiliation: Department of Psychiatry, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Emran M
authors.initials: EM
authors.lastname: Razaghi
authors.affiliation: Department of Communication Studies, Media, ICT/Interpersonal Relations in Organizations and Society (MIOS), University of Antwerp, Sint-Jacobsstraat 2, 2000, Antwerp, Belgium.|Department of Communication Studies, Research Group for Media & ICT (MICT), Ghent University, Korte Meer 11, 9000, Ghent, Belgium.|Higher Institute for Family Sciences, Odisee, Huart Hamoirlaan 136, 1030, Brussels, Belgium.|Antwerp Maritime Academy, Noordkasteel Oost 6, Antwerp, 2030, Belgium.
authors.forename: Koen
authors.initials: K
authors.lastname: Ponnet
authors.affiliation: Department of Demography, Faculty of Social Sciences, University of Tehran, Tehran, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Torabi
authors.affiliation: Department of Neurosciences and Addiction Studies,School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Seyed Ali
authors.initials: SA
authors.lastname: Shafiee
authors.affiliation: Social Determinants of Health Research Center, Kurdistan University of Medical Sciences, Sanandaj, Iran. pashaeit@gmail.com.|Department of public health, School of Health, Kurdistan University of Medical Sciences, Sanandaj, Iran. pashaeit@gmail.com.
authors.forename: Tahereh
authors.initials: T
authors.lastname: Pashaei
mesh_terms: D000328:Adult; D019969:Amphetamine-Related Disorders / Q000175:diagnosis* / Q000628:therapy; D003376:Counseling; D005260:Female; D006801:Humans; D007492:Iran; D008297:Male; D016016:Proportional Hazards Models; D012008:Recurrence; D012307:Risk Factors; D013997:Time Factors; D055815:Young Adult
keywords: ATS dependence; Matrix model; Relapse; Survival analysis; Treatment program