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Biomedical subjects

Timothy B Baker

Publications and source records attributed to Timothy B Baker.

At least 19 recordsLinked to original sources
PubMed2026

Optimizing smoking cessation pharmacotherapy and counseling for adult primary care patients: a factorial randomized controlled trial.

BACKGROUND: Even with the most effective smoking cessation pharmacotherapies (i.e., varenicline or combination nicotine replacement [C-NRT]), the majority of people ultimately return to smoking. This research explored how to optimize the use of varenicline and C-NRT to promote smoking cessation. METHODS: Primary care patients participated in a 2x2x2x2 factorial experiment that evaluated 4 factors: 1) Medication Type (Varenicline vs. C-NRT [patch + mini-lozenge]), 2) Preparation (pre-quit) Medication (4 Weeks vs. Standard); 3) Medication Duration (Extended [24 weeks] vs. Standard [12 weeks]); and 4) Counseling Type (Cessation Counseling [4 sessions] vs. Referral Support [2 sessions focused on use of referral resources]). This study was discontinued prior to reaching the proposed sample size (N = 608) due to pandemic-related budgetary constraints. RESULTS: Participants (N = 496) were 55% women and 45.6% Black individuals. There were no statistically significant main effects of the 4 factors on abstinence at 12, 26 or 52 weeks. There was a 3-way interaction between Medication Type, Preparation Medication, and Counseling Type (p = 0.04) predicting the primary outcome of biochemically confirmed abstinence at 52 weeks; cessation counseling vs. referral support improved varenicline quit rates when 4 weeks versus 1 week of pre-quit medication was offered. For C-NRT, counseling type did not significantly improve quit rates regardless of the use of preparation medication. CONCLUSIONS: There was no robust evidence that enhanced pre-quit or extended duration of varenicline or C-NRT increased abstinence rates. More intensive counseling may support cessation for different pharmacotherapy regimens. Given the lack of consistent findings, this research should be viewed as exploratory to guide future research.

Humans↗
PubMed2006

Organization, financing, promotion, and cost of U.S. quitlines, 2004.

BACKGROUND: Quitlines have been established as an effective, evidence-based, population-wide strategy to deliver smoking-cessation treatment, and are now available in most states across America. However, little is known about the organization, financing, promotion, and cost of state quitlines. METHODS: In 2004, the North American Quitline Consortium surveyed the 50 states and Washington DC to obtain information about state quitlines. Data were analyzed in fall 2005 through spring 2006. Analyses of these data are reported in this paper. RESULTS: Analyses were limited to the 38 states that reported having a quitline in 2004. State governments funded most (89.5%) quitlines. Median state quitline operating budgets in 2004 were 500,000 dollars; this translates into a modest annual median operating cost of 0.14 dollar per capita or 0.85 dollar per adult smoker. A lesser amount was spent for quitline promotion. Quitline services varied, with 97.4% of respondents providing mailed self-help resources, 89.5% providing proactive telephone counseling, and 89.2% providing referrals to other services. Many quitlines provide services in languages other than English. Only 21.1% of quitlines reported providing cessation medication at no cost. Promotional strategies varied widely. CONCLUSION: A large majority of U.S. smokers live in states with tobacco quitlines, which provide cessation treatment at a remarkably modest per capita cost. There is a great deal of congruence in services and promotional strategies among states. Further research is required to determine how external factors such as the federal National Network of Tobacco Cessation Quitlines funding for state quitlines and the availability of a national portal number (1-800-QUITNOW), both implemented in 2004, affect state quitlines. Additional research to evaluate the cost effectiveness of quitline services is also warranted.

Health Care Surveys↗
PubMed2006

Life before and after quitting smoking: an electronic diary study.

This article describes a multidimensional, multivariate, and multilevel approach to the assessment of nicotine withdrawal. In this prospective study, 70 adult smokers assigned to an active or placebo nicotine patch condition completed multiple daily assessments using an electronic diary. Average and individual growth curves were estimated for affective and nonaffective withdrawal symptoms. All symptoms but hunger increased significantly on the quit day and remained elevated for three weeks. Variability in symptom experiences across individuals increased from pre- to post-quit. Relations between symptom reports (e.g., negative affect or craving) and episodic events (e.g., stressful events or seeing someone smoke) changed from pre-quit to post-quit. Pre-quit increases in negative affect and quit-day increases in craving were inversely related to abstinence three months after the quit day, suggesting that anticipatory and immediate reactions to quitting influence success.

Administration, Cutaneous↗
PubMed2006

Assessing tobacco dependence: a guide to measure evaluation and selection.

Tobacco dependence is a key construct in tobacco research. This paper describes a construct validation approach to dependence assessment and describes key conceptual and psychometric criteria on which to evaluate putative measures of dependence. Five current dependence scales-the Fagerström Test for Nicotine Dependence; the Diagnostic and Statistical Manual of Mental Disorders (4th ed.); the Cigarette Dependence Scale; the Nicotine Dependence Syndrome Scale; and the Wisconsin Inventory of Smoking Dependence Motives-are examined with respect to these critical dimensions. Recommendations are made regarding the use of each measure.

Benchmarking↗
PubMed2005

Progression of college-age cigarette samplers: what influences outcome.

Experimental and occasional cigarette use among college students is widespread. Little is known about what differentiates the occasional college smoker who becomes a regular smoker from the one who does not. Possible risk factors include peer smoking, lifestyle factors, such as lack of exercise, and health/addiction concerns. The current study investigated the progression of smoking in a cohort of 321 low-level/occasional smokers. Over the course of 4 years, 45% of low-level/occasional users had become nonsmokers, 35% became occasional smokers, and 20% became daily smokers. Baseline exercise patterns, addiction beliefs, and smoking pervasiveness were modestly related to distal smoking outcome. The level of baseline smoking was strongly related to smoking outcome. These results support the wisdom of limiting access and exposure to cigarettes among the college population.

Adolescent↗
PubMed2005

Associations between phenylthiocarbamide gene polymorphisms and cigarette smoking.

Phenotypic evidence indicates that the ability to taste the bitter compounds phenylthiocarbamide (PTC) and 6-n-propylthiouracil (PROP) may protect against cigarette smoking. In this study, PTC gene haplotypes were found to be associated with both the odds of being a smoker and the importance of cigarette taste as a smoking motive. Smokers (n = 384) and nonsmokers (n = 183) were genotyped for polymorphisms that affect taste sensitivity to PTC and PROP. The "taster" PAV haplotype, relative to the "nontaster" AVI haplotype, was predicted to be associated with reduced odds of being a smoker and lower taste motivation as measured by the Wisconsin Inventory of Smoking Dependence Motives-68 taste/sensory processes scale. The results did not support the predicted association between the PAV and AVI haplotypes and smoker odds, but the AAV haplotype, which confers intermediate PTC/PROP taste sensitivity, was associated with reduced smoker prevalence (49% vs. 70%), chi(2)(1, N = 567) = 10.392, p = .001. The predicted relationship between PAV and AVI and taste motivation was found, F(2, 348) = 3.303, p = .038. The results encourage further exploration of the role of taste/sensory processes in tobacco dependence.

Adult↗
PubMed2004

Effectiveness of implementing the agency for healthcare research and quality smoking cessation clinical practice guideline: a randomized, controlled trial.

BACKGROUND: The Agency for Healthcare Research and Quality (AHRQ) Smoking Cessation Clinical Practice Guideline recommends that all clinicians strongly advise their patients who use tobacco to quit. METHODS: We conducted a randomized, controlled trial of the effectiveness of Guideline implementation at eight community-based primary care clinics in southern Wisconsin (four test sites, four control sites) among 2163 consecutively enrolled adult patients who smoked at least one cigarette per day and presented for nonemergency care during the baseline period (June 16, 1999, to June 20, 2000) or the intervention period (from June 21, 2000, to May 3, 2001). After collecting baseline data, staff at test sites implemented the intervention over a 2-month period. The intervention included a tutorial for intake clinicians, group and individual performance feedback for intake clinicians, use of a modified vital signs stamp, an offer of free nicotine replacement therapy, and proactive telephone counseling. Staff at control sites received only general information about the AHRQ Guideline. Self-reported abstinence from smoking was determined by telephone interviews at 2- and 6-month follow-up assessments. Hierarchical logistic regression models were used to estimate the odds ratios (ORs) for treatment assignment after adjustment for patient characteristics. All statistical tests were two-sided. RESULTS: There were no statistically significant differences in smoking cessation rates between participants at test and control sites during the baseline period. Among participants treated during the intervention period, those at test sites were more likely than those at control sites to report being abstinent at the 2-month (16.4% versus 5.8%; adjusted OR = 3.3, 95% confidence interval [CI] = 1.9 to 5.6; P<.001) and 6-month (15.4% versus 9.8%; adjusted OR = 1.7, 95% CI = 1.2 to 2.6; P =.009) follow-up assessments and to report continuous abstinence, that is, abstinence at both 2 and 6 months (10.9% versus 3.8%; adjusted OR = 3.4, 95% CI = 1.8 to 6.3; P<.001). CONCLUSION: Implementation of a guideline-based smoking cessation intervention by intake clinicians in primary care is associated with higher abstinence among smokers.

Adult↗
PubMed2004

Implementing guidelines for smoking cessation: comparing the efforts of nurses and medical assistants.

BACKGROUND: It is unclear how different types of intake clinicians (registered nurses [RNs], and less costly licensed practical nurses [LPNs] and medical assistants [MAs]) compare in the performance of smoking-cessation activities recommended in the Agency for Healthcare Research and Quality (AHRQ) smoking-cessation clinical practice guideline. METHODS: A secondary analysis of data from a randomized controlled trial of guideline implementation was performed. Exit interviews of consecutive adult smokers who presented to nine primary care clinics for routine, non-emergency care were conducted during the period February 2000 to May 2001; a total of 1221 patients with adequate data were analyzed. Intake clinicians were surveyed prior to guideline training. Hierarchical logistic regression models were used to determine the association between type of intake clinician and performance of cessation counseling at the clinic visit, after adjustment for patient-level covariates, intake clinicians' characteristics, and study site. RESULTS: Performance of all guideline-recommended counseling activities were significantly greater for all intake clinicians at test versus control sites. MAs were significantly less likely to assess willingness to quit (adjusted odds ratio [AOR]=0.4, 95% confidence interval [CI]=0.2-0.8, p =0.005) and tended to offer advice and assistance in quitting less often than RNs. Similar findings were observed for LPNs (AOR=0.5, 95% CI=0.3-1.0, p =0.03, for assessing willingness to quit). Subset analysis in subjects with complete survey data revealed that being seen by a MA was no longer associated with statistically significant differences in performance, after accounting for personal beliefs, self-efficacy, and role satisfaction in cessation counseling. CONCLUSIONS: Although both MAs and LPNs showed marked improvements in performance in response to the guideline intervention, patients seen by these intake clinicians were less likely to receive guideline-recommended counseling, compared to those patients seen by RNs. Given their important role in the delivery of preventive care, MAs and LPNs should receive proper training in cessation counseling, should have strong physician and administrative support, and should be included in efforts to implement smoking-cessation guidelines in primary care.

Adolescent↗
PubMed2004

Integrating smoking cessation treatment into primary care: an effectiveness study.

BACKGROUND: Lack of interest has been cited as a reason not to offer cessation assistance to smokers, but research suggests that smokers accept treatments offered proactively. This study assessed acceptability, utilization, and effectiveness of free smoking cessation treatment among diverse primary care patients. METHOD: Medical assistants invited 4174 adult smokers to participate. Enrollees (1869) self-selected or were assigned to receive free nicotine patch therapy alone or in combination with the Committed Quitters(R) program, and for some, individual counseling. RESULTS: In nearly 68% of cases, patients accepted a treatment invitation; 77% of eligible smokers enrolled; 85% of these picked up free patches. Given a choice of treatments, 75% of participants elected a psychosocial treatment in addition to patch therapy. Thirteen percent of treatment initiators achieved biochemically confirmed 7-day point-prevalence abstinence at 1 year, with no significant treatment effects. Minority patients showed greater initial interest but less utilization did than White patients. CONCLUSIONS: Free, readily accessible smoking cessation treatment offered in primary care settings was accepted and used by the majority of unselected smokers of diverse racial/ethnic origins. Psychosocial treatment components did not significantly increase abstinence rates. Barriers, rather than lack of interest, may keep minority smokers from using cessation treatments.

Administration, Cutaneous↗
PubMed2004

A multiple motives approach to tobacco dependence: the Wisconsin Inventory of Smoking Dependence Motives (WISDM-68).

The dependence construct fills an important explanatory role in motivational accounts of smoking and relapse. Frequently used measures of dependence are either atheoretical or grounded in a unidimensional model of physical dependence. This research creates a multidimensional measure of dependence that is based on theoretically grounded motives for drug use and is intended to reflect mechanisms underlying dependence. Data collected from a large sample of smokers (N = 775) indicated that all 13 subscales of the Wisconsin Inventory of Smoking Dependence Motives (WISDM-68) have acceptable internal consistency, are differentially present across levels of smoking heaviness, and have a multidimensional structure. Validity analyses indicated the WISDM-68 subscales are significantly related to dependence criteria such as smoking heaviness and to 4th edition Diagnostic and Statistical Manual of Mental Disorders symptoms of dependence and relapse.

Humans↗
PubMed2004

Addiction motivation reformulated: an affective processing model of negative reinforcement.

This article offers a reformulation of the negative reinforcement model of drug addiction and proposes that the escape and avoidance of negative affect is the prepotent motive for addictive drug use. The authors posit that negative affect is the motivational core of the withdrawal syndrome and argue that, through repeated cycles of drug use and withdrawal, addicted organisms learn to detect interoceptive cues of negative affect preconsciously. Thus, the motivational basis of much drug use is opaque and tends not to reflect cognitive control. When either stressors or abstinence causes negative affect to grow and enter consciousness, increasing negative affect biases information processing in ways that promote renewed drug administration. After explicating their model, the authors address previous critiques of negative reinforcement models in light of their reformulation and review predictions generated by their model.

Affect↗
PubMed2004

Prevalence and predictors of transitions in smoking behavior among college students.

The prevalence of smoking among college students is surprisingly high and represents a significant public health issue. However, there are few longitudinal studies of smoking in this population. This study examined the prevalence and predictors of transitions in smoking behavior among a cohort of 548 college students. Over the course of 4 years, 87% of daily smokers and almost 50% of occasional smokers continued to smoke. Among nonsmokers, 11.5% began smoking occasionally and none became daily smokers. In general, predictors of smoking behavior change were significant only among baseline occasional smokers and included gender, smoking outcome expectancies, and affect regulation expectations. Peer and parental smoking, demographics, affect, stress, and alcohol use were generally not predictive of change. Tobacco control interventions targeted at college students are clearly warranted.

Adolescent↗
PubMed2004

Motivational influences on cigarette smoking.

Cigarette smoking is a leading cause of mortality and morbidity and a particularly common and intractable addictive disorder. Research shows that nicotine is a sine qua non of tobacco addiction and that it produces the hallmark effects of addictive drugs: sensitization, tolerance, physical dependence, and euphoria/elation. Research on the development of smoking reveals that although smoking prevalence has declined from a peak in the mid-1990s, close to 30% of twelfth graders still smoke. Smoking in adolescents is related to development of physical dependence, ethnicity, impulsivity, affective disorder, and peer influences. However, which of these exerts the greatest causal effects is unknown, and their influence no doubt varies across individuals and across development. Once dependence on tobacco smoking is established, evidence suggests that tobacco motivation is strongly influenced by a reduction in withdrawal symptoms, an expectation of stress reduction, and conditioned reinforcement. Nicotine motivation may also be influenced by modulation in stimulus incentive value.

Adolescent↗
PubMed2004

Preventing 3 million premature deaths and helping 5 million smokers quit: a national action plan for tobacco cessation.

In August 2002, the Subcommittee on Cessation of the Interagency Committee on Smoking and Health (ICSH) was charged with developing recommendations to substantially increase rates of tobacco cessation in the United States. The subcommittee's report, A National Action Plan for Tobacco Cessation, outlines 10 recommendations for reducing premature morbidity and mortality by helping millions of Americans stop using tobacco. The plan includes both evidence-based, population-wide strategies designed to promote cessation (e.g., a national quitline network) and a Smokers' Health Fund to finance the programs (through a 2 US dollar per pack excise tax increase). The subcommittee report was presented to the ICSH (February 11, 2003), which unanimously endorsed sending it to Secretary Thompson for his consideration. In this article, we summarize the national action plan.

Cause of Death↗
PubMed2003

Introduction to the special section on structural equation modeling.

Structural equation modeling (SEM) is a frequently used data-analytic technique in psychopathology research. This popularity is due to the unique capabilities and broad applicability of SEM and to recent advances in model and software development. Unfortunately, the popularity and accessibility of SEM is matched by its complexities and ambiguities. Thus, users are often faced with difficult decisions regarding a variety of issues. This special section is designed to increase the effective use of SEM by reviewing recently developed modeling capabilities, identifying common problems in application, and recommending appropriate strategies for analysis and evaluation.

Humans↗
PubMed2003

Smoking withdrawal dynamics: III. Correlates of withdrawal heterogeneity.

Five parameters of postcessation smoking withdrawal variability derived from clinical data (T. M. Piasecki, D. E. Jorenby, S. S. Smith, M. C. Fiore, & T. B. Baker, 2003a, 2003b) were predicted from baseline measures and pharmacotherapy assignment. Smokers who were more dependent, older, and high in negative affect reported more severe withdrawal. Women, heavier smokers, and those with a history of depression reported more variable symptoms. Smokers treated with nicotine patch, bupropion, or both reported less severe withdrawal than did those given placebo, but medication did not affect the slope of symptoms over time, day-to-day variability of symptoms, or the size of acute changes in symptoms associated with lapses to smoking. Prior research has shown that these symptom facets predict later relapse: thus, current pharmacotherapies may aid cessation by diminishing withdrawal severity, but they do not affect all clinically important aspects of withdrawal.

Administration, Cutaneous↗