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Long-term Behavior Change - 1

11 agosto 2015 aggiornato da: Friends Research Institute, Inc.

Behavior Change: Reinforcement Schedule Effects

The purpose of this study is to determine if different reinforcement procedures (i.e., schedules) produce different patterns of long-term abstinence from methamphetamine. We anticipate that the three contingency management conditions will promote longer periods of abstinence in the year following treatment relative to the standard control group. Furthermore, we predict that the intermittent reinforcement procedures will produce longer periods of continued abstinence (i.e., long-term behavior change) in the year following treatment than the continuous reinforcement procedure. Finally, we predict that the intermittent unpredictable schedule will produce longer lasting behavior change than the intermittent predictable schedule. Methamphetamine use will be measured using urine toxicology and self-report of methamphetamine use.

Panoramica dello studio

Stato

Completato

Condizioni

Intervento / Trattamento

Descrizione dettagliata

Briefly the four study conditions are: (1) standard treatment which consists of 16 weeks of psychosocial treatment, (2) continuous contingency management which consists of 16 weeks of psychosocial treatment with a contingency management procedure in effect during the first twelve weeks in which vouchers are made available after each provision of a methamphetamine-negative urine test, (3) intermittent predictable contingency management which consists of 16 weeks of psychosocial treatment with a contingency management procedure in effect during the first twelve weeks in which vouchers are available after the provision of every three consecutive methamphetamine-negative urine samples, and (4) intermittent unpredictable contingency management which consists of 16 weeks of psychosocial treatment with a contingency management procedure in effect during the first twelve weeks in which vouchers are available on one day each week (randomly selected after the first week) for the provision of methamphetamine-negative urine samples provided all urine samples since delivery of the last reinforcer were also methamphetamine negative.

Tipo di studio

Interventistico

Iscrizione (Effettivo)

119

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

  • Stati Uniti
    • California
      • Los Angeles, California, Stati Uniti, 90025
        • Friends Research Institute
      • Rancho Cucamonga, California, Stati Uniti, 91730
        • Friends Research Institute

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

Da 18 anni a 65 anni (Adulto, Adulto più anziano)

Accetta volontari sani

No

Sessi ammissibili allo studio

Tutto

Descrizione

Inclusion Criteria:

  • Meet Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) criteria for methamphetamine dependence
  • Willing and able to comply with study procedures
  • Willing and able to provide written informed consent

Exclusion Criteria:

  • Have a medical condition that, in the study Principal Investigator (PI's) judgment, might interfere with safe study participation
  • Have a recent (past 30 days) history of suicide attempts and/or current serious suicidal intention or plan as assessed by the Beck Depression Inventory (BDI)
  • Have a history of violent criminal behavior or be on parole
  • Any other circumstances that, in the opinion of the PI, would interfere with safe study participation

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Nessuno (etichetta aperta)

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: continuous voucher schedule
Those in the continuous condition will receive a contingency management voucher each time they test negative for methamphetamine. The initial voucher value will be $2.50. Each consecutive instance of abstinence will increase the magnitude of the voucher by $1.50. Three consecutive abstinences will result in the delivery of a $10.00 bonus. Provision of a methamphetamine-positive urine sample, or failure to test, will result in a reset in the voucher magnitude back to its original level from whence the progression can begin again. All participants will provide observed urine samples three times a week (e.g., M, W, & F) for twelve weeks and will complete study-related measures one time per week.
Comportamentale: contingency management voucher
participants receive vouchers for the provision of methamphetamine-negative urines. Vouchers can be redeemed for goods and services compatible with non-drug using behaviors.
Sperimentale: intermittent predictable schedule
Those in the intermittent predictable condition will earn a contingency management voucher when they provide three consecutive methamphetamine-negative urine tests. Participants in the intermittent predictable condition will receive $22.00 for the provision of their first three consecutive methamphetamine-negative urine samples, $35.50 for the provision of their second set of three consecutive instances of methamphetamine-negative urine samples, and so forth. There are no bonuses for consecutive instances of abstinence in the intermittent predictable condition. Provision of a methamphetamine-positive urine sample, or failure to test, will result in a reset in the voucher magnitude back to its original level from whence the progression can begin again. All participants will provide observed urine samples three times a week (e.g., M, W, & F) for twelve weeks and will complete study-related measures one time per week.
Comportamentale: contingency management voucher
participants receive vouchers for the provision of methamphetamine-negative urines. Vouchers can be redeemed for goods and services compatible with non-drug using behaviors.
Sperimentale: intermittent unpredictable schedule
Those in the intermittent unpredictable condition will be eligible to receive a contingency management voucher on one day a week. Participants in this group will receive a voucher for $22.00 following their first 3 methamphetamine-negative urine tests. They will then be eligible to receive a voucher one day a week if all of their urine tests since the receipt of their last voucher were methamphetamine negative. They will receive a voucher for $35.50 for the provision of their second set of 3 consecutive instances of methamphetamine-negative urine samples, $49.00 for their third set of 3 consecutive instances, and so forth. The day of the week on which the voucher will be available will be randomly selected for each week and the participants will not know which day of the week they will be eligible to receive a voucher until they have provided their urine test. All participants will provide observed urine samples M, W, & F for 12 wks and complete measures 1x/wk.
Comportamentale: contingency management voucher
participants receive vouchers for the provision of methamphetamine-negative urines. Vouchers can be redeemed for goods and services compatible with non-drug using behaviors.
Nessun intervento: standard
Participants assigned to the standard condition will not receive vouchers for the provision of clean urines. All participants will provide observed urine samples three times a week (e.g., M, W, & F) for twelve weeks and will complete study-related measures one time per week.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Methamphetamine Use During Intervention
Lasso di tempo: 3x/week for 16 weeks
Drug use measured by urine toxicology conducted by on site Enzyme-multiplied immunoassay technique (EMIT) assay over time.
3x/week for 16 weeks
Methamphetamine Use, Measured by Number of Consecutive Days of Abstinence
Lasso di tempo: 16 Weeks
Drug use measured by urine toxicology conducted by on site EMIT assay and added up to obtain how many days of consecutive abstinence were observed for each individual
16 Weeks
Methamphetamine Use, Follow-Up
Lasso di tempo: 1x/month for 4 months
Drug use measured by urine toxicology conducted by on site EMIT assay over time
1x/month for 4 months

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Friends Research Institute, Inc.

Collaboratori

National Institute on Drug Abuse (NIDA)

Investigatori

  • Investigatore principale: John Roll, Ph.D., University of California, Los Angeles

Pubblicazioni e link utili

La persona responsabile dell'inserimento delle informazioni sullo studio fornisce volontariamente queste pubblicazioni. Questi possono riguardare qualsiasi cosa relativa allo studio.

Pubblicazioni generali

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio

1 dicembre 2004

Completamento primario (Effettivo)

1 giugno 2008

Completamento dello studio (Effettivo)

1 giugno 2008

Date di iscrizione allo studio

Primo inviato

8 settembre 2005

Primo inviato che soddisfa i criteri di controllo qualità

8 settembre 2005

Primo Inserito (Stima)

12 settembre 2005

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Stima)

25 agosto 2015

Ultimo aggiornamento inviato che soddisfa i criteri QC

11 agosto 2015

Ultimo verificato

1 agosto 2015

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • NIDA-17407-1
  • R01DA017407 (Sovvenzione/contratto NIH degli Stati Uniti)
  • R01-17407-1

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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