Browsing by Author "Blazer, Dan G"
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A dimensional approach to understanding severity estimates and risk correlates of marijuana abuse and dependence in adults.
Wu, Li-Tzy; Woody, George E; Yang, Chongming; Pan, Jeng-Jong; Reeve, Bryce B; Blazer, Dan G (International journal of methods in psychiatric research, 2012-06)While item response theory (IRT) research shows a latent severity trait underlying response patterns of substance abuse and dependence symptoms, little is known about IRT-based severity estimates in relation to clinically ... -
Alcohol and drug dependence symptom items as brief screeners for substance use disorders: results from the Clinical Trials Network.
Wu, Li-Tzy; Blazer, Dan G; Woody, George E; Burchett, Bruce; Yang, Chongming; Pan, Jeng-Jong; Ling, Walter (Journal of psychiatric research, 2012-03)AIM:To address an urgent need for screening of substance use problems in medical settings, we examined substance-specific dependence criteria as potential brief screeners for the detection of patients with a substance use ... -
Alcohol and drug use disorders among adults in emergency department settings in the United States.
Wu, Li-Tzy; Swartz, Marvin S; Wu, Zunyou; Mannelli, Paolo; Yang, Chongming; Blazer, Dan G (Annals of emergency medicine, 2012-08)Improving identification and treatment for substance use disorders is a national priority, but data about various drug use disorders encountered in emergency departments (EDs) are lacking. We examine past-year substance ... -
An item response theory analysis of DSM-IV criteria for hallucinogen abuse and dependence in adolescents.
Wu, Li-Tzy; Pan, Jeng-Jong; Yang, Chongming; Reeve, Bryce B; Blazer, Dan G (Addictive behaviors, 2010-03)AIM:This study applied both item response theory (IRT) and multiple indicators-multiple causes (MIMIC) methods to evaluate item-level psychometric properties of diagnostic questions for hallucinogen use disorders (HUDs), ... -
An item response theory modeling of alcohol and marijuana dependences: a National Drug Abuse Treatment Clinical Trials Network study.
Wu, Li-Tzy; Pan, Jeng-Jong; Blazer, Dan G; Tai, Betty; Stitzer, Maxine L; Brooner, Robert K; Woody, George E; ... (9 authors) (Journal of studies on alcohol and drugs, 2009-05)OBJECTIVE:The aim of this study was to examine psychometric properties of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV), diagnostics criteria for alcohol and marijuana dependences among ... -
Co-occurring amphetamine use and associated medical and psychiatric comorbidity among opioid-dependent adults: results from the Clinical Trials Network.
Pilowsky, Daniel J; Wu, Li-Tzy; Burchett, Bruce; Blazer, Dan G; Woody, George E; Ling, Walter (Subst Abuse Rehabil, 2011-01-01)BACKGROUND: In response to the rising rate of treatment admissions related to illicit use of amphetamines (eg, methamphetamine), we examined the prevalence of amphetamine use among treatment-seeking, opioid-dependent adults, ... -
Comorbid substance use disorders with other Axis I and II mental disorders among treatment-seeking Asian Americans, Native Hawaiians/Pacific Islanders, and mixed-race people.
Wu, Li-Tzy; Blazer, Dan G; Gersing, Kenneth R; Burchett, Bruce; Swartz, Marvin S; Mannelli, Paolo; NIDA AAPI Workgroup (Journal of psychiatric research, 2013-12)Little is known about behavioral healthcare needs of Asian Americans (AAs), Native Hawaiians/Pacific Islanders (NHs/PIs), and mixed-race people (MRs)-the fastest growing segments of the U.S. population. We examined substance ... -
Construct and differential item functioning in the assessment of prescription opioid use disorders among American adolescents.
Wu, Li-Tzy; Ringwalt, Christopher L; Yang, Chongming; Reeve, Bryce B; Pan, Jeng-Jong; Blazer, Dan G (Journal of the American Academy of Child and Adolescent Psychiatry, 2009-05)OBJECTIVE:To examine the psychometric properties of diagnostic criteria for prescription analgesic opioid use disorders (OUDs) and to identify background predictors of a latent continuum for OUD liability. METHOD:Data were ... -
Datapoints: Use of medications and counseling for depression by Asian and multiple-race adolescents aged 12-17 years.
Wu, Li-Tzy; Blazer, Dan G (Psychiatric services (Washington, D.C.), 2012-09) -
Depressive symptoms, substance use, and HIV-related high-risk behaviors among opioid-dependent individuals: results from the Clinical Trials Network.
Pilowsky, Daniel J; Wu, Li-Tzy; Burchett, Bruce; Blazer, Dan G; Ling, Walter (Substance use & misuse, 2011-01)The sample included 343 opioid-dependent adults enrolled in two national multisite studies of the National Drug Abuse Treatment Clinical Trials Network (CTN001-002). Opioid-dependent individuals were recruited from 12 sites ... -
Differences in onset and abuse/dependence episodes between prescription opioids and heroin: results from the National Epidemiologic Survey on Alcohol and Related Conditions.
Wu, Li-Tzy; Woody, George E; Yang, Chongming; Mannelli, Paolo; Blazer, Dan G (Subst Abuse Rehabil, 2011-05)OBJECTIVES: To examine patterns of onset and abuse/dependence episodes of prescription opioid (PO) and heroin use disorders in a national sample of adults, and to explore differences by gender and substance abuse treatment ... -
Drs. Blazer and Wu reply
Blazer, Dan G; Wu, Li-Tzy (American Journal of Psychiatry, 2010-01-01) -
Equalization of four cardiovascular risk algorithms after systematic recalibration: individual-participant meta-analysis of 86 prospective studies.
Pennells, Lisa; Kaptoge, Stephen; Wood, Angela; Sweeting, Mike; Zhao, Xiaohui; White, Ian; Burgess, Stephen; ... (101 authors) (European heart journal, 2019-02)AIMS:There is debate about the optimum algorithm for cardiovascular disease (CVD) risk estimation. We conducted head-to-head comparisons of four algorithms recommended by primary prevention guidelines, before and ... -
Evaluating brief screeners to discriminate between drug use disorders in a sample of treatment-seeking adults.
Wu, Li-Tzy; Swartz, Marvin S; Pan, Jeng-Jong; Burchett, Bruce; Mannelli, Paolo; Yang, Chongming; Blazer, Dan G (General hospital psychiatry, 2013-01)OBJECTIVE:The objective was to identify a potential core set of brief screeners for the detection of individuals with a substance use disorder (SUD) in medical settings. METHOD:Data were from two multisite studies that evaluated ... -
Gender and racial/ethnic differences in addiction severity, HIV risk, and quality of life among adults in opioid detoxification: results from the National Drug Abuse Treatment Clinical Trials Network.
Wu, Li-Tzy; Ling, Walter; Burchett, Bruce; Blazer, Dan G; Shostak, Jack; Woody, George E (Subst Abuse Rehabil, 2010-12)PURPOSE: Detoxification often serves as an initial contact for treatment and represents an opportunity for engaging patients in aftercare to prevent relapse. However, there is limited information concerning clinical profiles ... -
Hallucinogen-related disorders in a national sample of adolescents: the influence of ecstasy/MDMA use.
Wu, Li-Tzy; Ringwalt, Christopher L; Weiss, Roger D; Blazer, Dan G (Drug and alcohol dependence, 2009-09)To present the prevalence and correlates of hallucinogen use disorders (HUDs: abuse or dependence) and subthreshold dependence.The study sample included adolescents aged 12-17 years (N=55,286) who participated in the National ... -
Heterogeneity of stimulant dependence: a national drug abuse treatment clinical trials network study.
Wu, Li-Tzy; Blazer, Dan G; Patkar, Ashwin A; Stitzer, Maxine L; Wakim, Paul G; Brooner, Robert K (The American journal on addictions, 2009-05)We investigated the presence of DSM-IV subtyping for dependence on cocaine and amphetamines (with versus without physical dependence) among outpatient stimulant users enrolled in a multisite study of the Clinical Trials ... -
How do prescription opioid users differ from users of heroin or other drugs in psychopathology: results from the National Epidemiologic Survey on Alcohol and Related Conditions.
Wu, Li-Tzy; Woody, George E; Yang, Chongming; Blazer, Dan G (Journal of addiction medicine, 2011-03)To study substance use and psychiatric disorders among prescription opioid users, heroin users, and non-opioid drug users in a national sample of adults.Analyses of data from the 2001-2002 National Epidemiologic Survey on ... -
Illicit and nonmedical drug use among Asian Americans, Native Hawaiians/Pacific Islanders, and mixed-race individuals.
Wu, Li-Tzy; Blazer, Dan G; Swartz, Marvin S; Burchett, Bruce; Brady, Kathleen T; NIDA AAPI Workgroup (Drug and alcohol dependence, 2013-12)The racial/ethnic composition of the United States is shifting rapidly, with non-Hispanic Asian-Americans, Native Hawaiians/Pacific Islanders (NHs/PIs), and mixed-race individuals the fastest growing segments of the population. ... -
Illicit and nonmedical drug use among older adults: a review.
Wu, Li-Tzy; Blazer, Dan G (Journal of aging and health, 2011-04)Substance abuse among older adults is a looming public health concern. The number of Americans aged 50+ years with a substance use disorder is projected to double from 2.8 million in 2002-2006 to 5.7 million in 2020. The ...