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Dive into the research topics where George De Leon is active.

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Featured researches published by George De Leon.


American Journal of Drug and Alcohol Abuse | 1997

Motivation and Readiness for Therapeutic Community Treatment among Adolescents and Adult Substance Abusers

Gerald Melnick; George De Leon; Josephine Hawke; Nancy Jainchill; David Kressel

A growing body of research has demonstrated the importance of motivation and readiness among drug abusers in seeking, complying with, and remaining in treatment. To date, however, there is little research on these factors among adolescent substance abusers. The present study reports findings from a large scale investigation of motivation and readiness differences across adolescent (range = 14-18 years, n > 1000) and adult (range = 19-26 + years, n > 1400) admissions to residential therapeutic communities (TCs). Data were collected with an instrument assessing circumstances, motivation, readiness, and suitability for TC treatment (i.e., CMRS). Results showed that: (1) there is a significant positive linear relationship between CMRS scores and age; (2) the CMRS scores were the largest and most consistent predictors of short term retention across all age groups. Although confined to TC samples, the present findings support clinical observations that adolescent drug abusers are less motivated to change or ready for treatment than adults; and they confirm the importance of motivational and readiness factors in the treatment process, regardless of age.


American Journal of Drug and Alcohol Abuse | 2000

Motivation for Treatment in a Prison-Based Therapeutic Community

George De Leon; Gerald Melnick; George Thomas; David Kressel; Harry K. Wexler

Current research concludes that participation in postprison aftercare is critical to the effectiveness of prison-based therapeutic community (TC) treatment. This conclusion makes it imperative to understand the client determinants of retention in prison treatment, particularly continuance in postprison aftercare. Currently, however, little data exist as to client predictors of seeking and remaining in prison-based TCs or entering postrelease aftercare. In the present study, significant relationships were obtained between initial motivation (i.e., Circumstances, Motivation, Readiness [CMR] scores), retention, aftercare, and outcomes in a sample of substance abusers treated in a prison-based TC program. Implications are discussed for theory, research, and treatment policy.


Journal of Psychoactive Drugs | 2000

Adolescents in Therapeutic Communities: One-Year Posttreatment Outcomes

Nancy Jainchill; Josephine Hawke; George De Leon; John Yagelka

Abstract Given the dearth of information concerning outcomes for adolescents who have been in treatment for substance abuse and related problems, the purpose of the present article is to examine the posttreatment status of adolescents who have been in residential therapeutic communities (TCs). One-year posttreatment outcome data are described for 485 adolescents, and separately for treatment “completers” and “noncompleters.” The majority of the sample had been mandated to treatment by the criminal justice system. Most reported marijuana as their main drug of abuse. There were significant reductions in drug use and criminal activity, and the most consistent predictors of positive outcomes were completion of treatment and not associating with deviant peers posttreatment. The findings were obtained on a treatment sample for whom there is relatively little research to date; they provide important evidence for the effectiveness of the therapeutic community for this population.


Journal of Substance Abuse Treatment | 1999

Clarifying the nature of therapeutic community treatment. The Survey of Essential Elements Questionnaire (SEEQ).

Gerald Melnick; George De Leon

This study reports on the extent to which Therapeutic Community (TC) agencies share a common set of beliefs about the essential elements of TC treatment. The Survey of Essential Elements Questionnaire (SEEQ), a TC theory-based instrument, was used in a field survey of 59 directors of agencies identified as TCs through their membership in Therapeutic Communities of America (TCA). Results showed a high degree of concordance in the perceived importance of a common set of treatment elements identified as essential to the TC modality. Two clusters of TC-oriented agencies, identified as Traditional and Modified, were determined based on beliefs in the importance of the elements. Results were seen as validating the TC formulation from which the SEEQ items were drawn. Implications on the potential use of the SEEQ as a means of codifying TC treatment for research, training, and quality assurance are discussed.


Journal of Psychopathology and Behavioral Assessment | 1997

Ethnic differences in psychiatric disorders among adolescent substance abusers in treatment

Nancy Jainchill; George De Leon; John Yagelka

The present study describes the diagnostic profile of over 800 adolescents admitted to residential therapeutic community programs for treatment of drug abuse and related problems. The relationship between race/ethnicity and psychiatric disturbance is examined, and the association among these factors to outcome is investigated. Over 90% of the sample had a DSM-III-R nonsubstance diagnosis. There were significant differences among the race/ethnic groups on attention deficit-hyperactivity and the disruptive behavior and affective disorders. In general, African-American adolescents yielded the lowest rates of disturbance across all categories of disorders. There was no relationship among race/ethnicity, psychiatric disturbance, and 1-year posttreatment outcomes.


Journal of Substance Abuse Treatment | 1998

Modified Therapeutic Community for Homeless Mentally Ill Chemical Abusers Sociodemographic and Psychological Profiles

Stanley Sacks; George De Leon; Elizabeth Balistreri; Hilary James Liberty; Karen McKendrick; JoAnn Y. Sacks; Graham Staines; John Yagelka

This paper, the first in a series of reports from a field study on the efficacy of modified therapeutic community (TC) treatment for homeless mentally ill chemical abusers, presents sociodemographic profiles, psychiatric diagnosis, and psychological symptom data on 342 homeless mentally ill chemical abusing clients seeking treatment in mental health community residence settings. The findings reflect the multidimensional deficits, social dysfunctionality, and severity of psychopathology of the study sample. The paper discusses the implications of these findings for program design and program planning, with special reference to modified TC programs.


Journal of Substance Abuse | 2000

Service use and cost by mentally ill chemical abusers: differences by retention in a therapeutic community.

Kerry Anne McGeary; Michael T. French; Stanley Sacks; Karen McKendrick; George De Leon

PURPOSEnEarlier research estimated the incremental costs and outcomes of a modified therapeutic community (modified TC) for mentally ill chemical abusers (MICAs) relative to a treatment-as-usual (TAU) control group. The present study extended the cost analysis by disaggregating the modified TC group into clients who completed the program (completers) and clients who dropped out (separaters).nnnMETHODSnBivariate and multivariate analyses were conducted to estimate differences in treatment and other service costs among completers, separaters, and TAU. Subjects were sequentially assigned to the modified TC (n = 171) or TAU (n = 47), and the analysis period covered 12 months post-baseline. Using a standardized instrument to collect resource use and cost data, the estimated weekly cost per client in the modified TC was


Journal of Addictive Diseases | 2002

Improved Psychological Status in a Modified Therapeutic Community for Homeless MICA Men

Susan Egelko; Marc Galanter; Helen Dermatis; Eva Jurewicz; Andrea Jamison; Shannon Dingle; George De Leon

554, with completers showing a larger average cost of treatment (


Journal of Substance Abuse Treatment | 2004

Commentary on “Self-help organizations for alcohol and drug problems: Toward evidence-based practice and policy”

George De Leon

27,595) than separaters (


Journal of Addictions Nursing | 1992

Crack/Cocaine Abusers in the General Hospital: Assessment and Initiation of Care

Marc Galanter; Susan Egelko; George De Leon; Charles Rohrs; Hugo Franco

9,986).nnnRESULTSnThe average TAU subject had a much higher cost for other (non-modified TC) services (

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Gerald Melnick

National Dairy Research Institute

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John Yagelka

National Dairy Research Institute

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Nancy Jainchill

National Dairy Research Institute

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David Kressel

National Dairy Research Institute

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Josephine Hawke

National Dairy Research Institute

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Karen McKendrick

National Dairy Research Institute

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Stanley Sacks

National Dairy Research Institute

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