title: Duration effects in contingency management treatment of methamphetamine disorders.
abstract: The primary aim of this study was to determine whether different durations of contingency management (CM) in conjunction with psychosocial treatment produced different rates of abstinence among methamphetamine dependent individuals. Participants were randomized to one of the four 16-week treatment conditions: standard psychosocial treatment or psychosocial treatment plus one of the three durations of CM (one-month, two-month, or four-month). A total of 118 participants were randomized to the four treatment conditions. There were significant differences across treatment conditions for number of consecutive days of methamphetamine abstinence (p<0.05). These differences were in the hypothesized direction, as participants were more likely to remain abstinent through the 16-week trial as CM duration increased. A significant effect of treatment condition (p<0.05) and time (p<0.05) on abstinence over time was also found. Longer durations of CM were more effective for maintaining methamphetamine abstinence.
authors.affiliation: Washington State University, Program of Excellence in the Addictions, WA, USA. johnroll@wsu.edu
authors.forename: John M
authors.initials: JM
authors.lastname: Roll
authors.forename: Joy
authors.initials: J
authors.lastname: Chudzynski
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Cameron
authors.forename: Donelle N
authors.initials: DN
authors.lastname: Howell
authors.forename: Sterling
authors.initials: S
authors.lastname: McPherson
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D019969:Amphetamine-Related Disorders / Q000534:rehabilitation* / Q000652:urine; D000704:Analysis of Variance; D001521:Behavior Therapy / Q000379:methods*; D000697:Central Nervous System Stimulants / Q000009:adverse effects / Q000652:urine*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008694:Methamphetamine / Q000009:adverse effects / Q000652:urine*; D008875:Middle Aged; D010349:Patient Compliance / Q000706:statistics & numerical data; D011615:Psychotherapy, Group / Q000379:methods; D012055:Reinforcement Schedule; D012720:Severity of Illness Index; D015813:Substance Abuse Detection; D013997:Time Factors; D016896:Treatment Outcome; D014481:United States; D055815:Young Adult
chemical_list: D000697:Central Nervous System Stimulants; D008694:Methamphetamine