Advancing Analytic Approaches to Address Key Questions in Mechanisms of Behavior Change Research

Mechanisms of Behavior Change in Adolescent Substance Use Treatment: A Systematic Review of Treatment Mediators and Recommendations for Advancing Future Research

Substance use disorders commonly onset during adolescence, yet the best available treatments yield only modest and transient effects. Elucidating treatment mediators is essential for improving treatment options. This review summarizes over 20 years of research on mediators of adolescent substance use treatment; k = 17 studies assessing both treatment or treatment ingredient to mediator (a path) and mediator to treatment outcome (b path) paths were included. Mediators were categorized using the Science of Behavior Change target class framework. Overall, mediation tests supported four of eight self-regulation, two of 10 stress resilience and reactivity, six of 19 interpersonal and social process, and two of four treatment engagement and adherence mediators. To enhance the capacity of this work to inform clinical practice, we recommend future research examine theoretically informed mechanisms using temporally sequenced data among other methodological guidelines.

Daily mindfulness homework completion is associated with reduced drinking during a mindfulness-enriched emotion regulation treatment for alcohol use disorder

Homework is widely used in cognitive behavioral therapy (CBT) for alcohol use disorder (AUD). Theoretically, homework helps clients generalize skills acquired during treatment to their daily lives. However, clinical trials methodology has typically employed pre- and post-treatment assessments which has made evaluating the contribution of homework to behavior change a challenge. The current study leveraged daily diary data from a clinical trial of CBT for AUD to parse within- and between-person associations of mindfulness homework practice and alcohol consumption. Adults seeking treatment for AUD (N = 97) completed 12 treatment sessions and 84 consecutive daily smartphone surveys. Each day, participants reported on the frequency of prior day's formal and informal mindfulness homework practice, the duration of prior day's formal mindfulness practice, and prior day's alcohol consumption. Multilevel models tested within- and between-person associations of mindfulness homework practice with the odds of drinking and heavy drinking, accounting for prior day's alcohol use. Results revealed that greater-than-usual frequency and duration of formal daily mindfulness homework practice, but not informal mindfulness practice, were associated with lower odds of a drinking day. Further, greater-than-usual duration of formal daily mindfulness homework practice, but not frequency of mindfulness practice (formal or informal), was associated with lower odds of a heavy drinking day. Results suggest that formal daily mindfulness homework practice may be beneficial and extend the literature by demonstrating that it coincides with reduced drinking and heavy drinking odds within-persons during AUD treatment. Apprising AUD clients of the potential value of homework may help boost its uptake.

Reductions in WHO risk drinking levels correlate with alcohol craving among individuals with alcohol use disorder

BACKGROUND

Abstinence has historically been considered the preferred goal of alcohol use disorder (AUD) treatment. However, most individuals with AUD do not want to abstain and many are able to reduce their drinking successfully. Craving is often a target of pharmacological and behavioral interventions for AUD, and reductions in craving may signal recovery. Whether reductions in drinking during AUD treatment are associated with reductions in craving has not been well examined.

METHODS

We conducted secondary analyses of data from three AUD clinical trials (N's= 1327, 346, and 200). Drinking reductions from baseline to the end of treatment were measured as changes in World Health Organization (WHO) risk drinking levels; alcohol craving was measured using validated self-report measures. Regression analyses tested whether drinking reductions were associated with end-of-treatment craving reductions; moderation analyses tested whether associations between drinking reduction and end-of-treatment craving differed across AUD severity.

RESULTS

Reductions of at least 1 or at least 2 WHO risk drinking levels were associated with lower craving (all p's < 0.05). Results were substantively similar after removing abstainers at the end-of-treatment. Associations between drinking reductions and craving were generally not moderated by AUD severity.

CONCLUSIONS

Individuals with WHO risk drinking level reductions reported significantly lower craving, as compared to those who did not achieve meaningful reductions in drinking. The results demonstrate the utility of WHO risk drinking levels as AUD clinical trial endpoints and provide evidence that drinking reductions mitigate craving.

Beyond mediators: A critical review and methodological path forward for studying mechanisms in alcohol use treatment research

Understanding how treatments for alcohol use disorder (AUD) facilitate behavior change has long been recognized as an important area of research for advancing clinical care. However, despite decades of research, the specific mechanisms of change for most AUD treatments remain largely unknown because most prior work in the field has focused only on statistical mediation. Statistical mediation is a necessary but not sufficient condition to establish evidence for a mechanism of change. Mediators are intermediate variables that account statistically for the relationship between independent and dependent variables, whereas mechanisms provide more detailed explanations of how an intervention leads to a desired outcome. Thus, mediators and mechanisms are not equivalent. To advance mechanisms of behavior change research, in this critical review we provide an overview of methodological shortfalls of existing AUD treatment mechanism research and introduce an etiologically informed precision medicine approach that facilitates the testing of mechanisms of behavior change rather than treatment mediators. We propose a framework for studying mechanisms in alcohol treatment research that promises to facilitate our understanding of behavior change and precision medicine (i.e., for whom a given mechanism of behavior change operates and under what conditions). The framework presented in this review has several overarching goals, one of which is to provide a methodological roadmap for testing AUD recovery mechanisms. We provide two examples of our framework, one pharmacological and one behavioral, to facilitate future efforts to implement this methodological approach to mechanism research. The framework proposed in this critical review facilitates the alignment of AUD treatment mechanism research with current theories of etiologic mechanisms, precision medicine efforts, and cross-disciplinary approaches to testing mechanisms. Although no framework can address all the challenges related to mechanisms research, our goal is to help facilitate a shift toward more rigorous and falsifiable behavior change research.

Mechanisms of behavior change during alcohol treatment among negative affect drinkers: A time-varying effect model analysis using 84 consecutive days of ecological momentary assessment

OBJECTIVE

To better understand the timing and unique contribution of four potential mechanisms of behavior change (MOBC) during alcohol use disorder (AUD) treatment (negative affect, positive affect, alcohol craving, and adaptive alcohol coping), we used a time-varying effect modeling analytic approach to examine the change trajectories of alcohol abstinence, heavy drinking, the hypothesized MOBCs, and the time-varying associations between the MOBCs and alcohol outcomes.

METHOD

Participants (N = 181; Mage = 50.8 years, SD = 10.6; 51% women; 93.5% Caucasian) were enrolled in a 12-week randomized clinical trial of cognitive behavioral outpatient treatment program for AUD. For 84 consecutive days, participants provided self-reports of positive and negative affect, craving, alcohol use, and adaptive alcohol coping strategies employed.

RESULTS

Throughout the 84-day treatment window, higher daily average craving levels were associated with both decreased likelihood of alcohol abstinence and increased odds of heavy drinking, whereas higher adaptive alcohol coping was associated with increased odds of abstinence and decreased odds of heavy drinking. Higher negative affect was associated with decreased odds of abstinence in the first 10 days of treatment and increased odds of heavy drinking before Day 4 or Day 5. Higher positive affect was associated with decreased odds of heavy drinking during the first 4 or 5 days.

CONCLUSIONS

The differential time-varying associations between negative affect, positive affect, alcohol craving, adaptive alcohol coping, and alcohol use provide insights into how and when each of the MOBCs is active during AUD treatment. These findings can help optimize the efficacy of future AUD treatments. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Does sleep relate to next-day cannabis use during treatment? Findings from an adolescent and young adult motivational enhancement and cognitive behavioral therapy plus topiramate intervention

BACKGROUND

Interventions for youth cannabis use have limited efficacy. Sleep is likely to affect treatment response, as sleep difficulties are cross-sectionally associated with use and common during treatment. This analysis examined how sleep duration and subjective trouble sleeping related to next-day cannabis use among youth during cannabis treatment.

METHOD

Participants (N=64) received a psychosocial intervention plus topiramate versus placebo while completing a 6-week ecological momentary assessment study. Time-varying effect modeling (TVEM) examined within- and between-person associations between sleep and cannabis use and how the strength of within-person associations varied over the course of treatment.

RESULTS

TVEM resvealed that, between-participants, youth with longer average sleep duration used cannabis less often controlling for baseline cannabis use, topiramate, and weekend status. Daily within-person fluctuations in sleep duration and trouble were not associated with use.

CONCLUSIONS

Findings suggest regularly shorter sleep may impede treatment outcomes. Adolescents who regularly have insufficient sleep durations likely need additional intervention to improve sleep difficulties in tandem with cannabis use reduction.

Addictions treatment mechanisms of change science and implementation science: A critical review

This manuscript aims to contribute to the next phase of mechanisms of behavior change (MOBC) science on alcohol or other drug use. Specifically, we encourage the transition from a basic science orientation (i.e., knowledge generation) to a translational science orientation (i.e., knowledge application or Translational MOBC Science). To inform that transition, we examine MOBC science and implementation science and consider how these two research areas can intersect to capitalize on the goals, strengths, and key methodologies of each. First, we define MOBC science and implementation science and offer a brief historical rationale for these two areas of clinical research. Second, we summarize similarities in rationale and discuss two scenarios where one draws from the other-MOBC science on implementation strategy outcomes and implementation science on MOBC. We then focus on the latter scenario, and briefly review the MOBC knowledge base to consider its readiness for knowledge translation. Finally, we provide a series of research recommendations to facilitate the translation of MOBC science. These recommendations include: (1) identifying and targeting MOBC that are well suited for implementation, (2) use of MOBC research results to inform broader health behavior change theory, and (3) triangulation of a more diverse set of research methodologies to build a translational MOBC knowledge base. Ultimately, it is important for gains borne from MOBC science to affect direct patient care, while basic MOBC research continues to be developed and refined over time. Potential implications of these developments include greater clinical significance for MOBC science, an efficient feedback loop between clinical research methodologies, a multi-level approach to understanding behavioral change, and reduced or eliminated siloes between MOBC science and implementation science.

Remotely Assessing Mechanisms of Behavioral Change in Community Substance Use Disorder Treatment to Facilitate Measurement-Informed Care: Pilot Longitudinal Questionnaire Study

Background

Research shows that improvements in coping strategies, abstinence self-efficacy, craving, and depression are potential mechanisms of behavioral change (MOBC) in treatments for substance use disorders (SUDs). However, little is known about how these insights regarding MOBC can be applied to SUD treatment settings. One way to facilitate MOBC-informed care in frontline settings could be to measure and monitor changes in MOBC throughout treatment using brief, frequent questionnaires that patients complete by using mobile technologies (eg, smartphones). The results derived from these questionnaires could potentially be used for clinical monitoring (ie, measurement-based care) to better understand whether individual patients are experiencing treatment-related improvements on key clinical targets.

Objective

This study evaluated whether brief, weekly MOBC questionnaires completed by patients remotely can potentially provide clinically meaningful information about changes in MOBC in the context of real-world, community-based SUD treatment.

Methods

A total of 30 patients (14/30, 47% female; 13/30, 43% racial or ethnic minority) in a community SUD treatment clinic participated in a pilot study where they were invited to complete brief, weekly questionnaires that assessed various MOBC, including coping strategies, abstinence self-efficacy, craving, depression, and therapeutic alliance. Questionnaires were typically completed remotely via smartphone for up to 6 months; 618 questionnaires were completed in total. Participants also completed longer, psychometrically validated measures of the same MOBC at baseline and 6-month research appointments. Statistical analyses tested whether brief, weekly, remotely completed MOBC questionnaires exhibited characteristics that would be desirable for real-world longitudinal clinical monitoring, including a tendency to detect within-person changes in MOBC over time; cross-sectional and longitudinal associations with longer, psychometrically validated measures completed at research appointments; and similar patterns of associations with 6-month percentage of days abstinent as longer, psychometrically validated MOBC measures completed at research appointments.

Results

The results of this study indicated that the brief, weekly, remotely completed MOBC measures exhibited characteristics that are desirable for clinical monitoring, including a tendency to vary longitudinally (within patients over time) more often than measures of alcohol and drug consumption, generally having medium to large cross-sectional and longitudinal correlations with longer psychometrically validated measures of MOBC completed at research appointments, and generally having similar patterns of association with 6-month percentage of days abstinent from alcohol and drugs as longer psychometrically validated MOBC measures completed at research appointments.

Conclusions

The results of this pilot study provide initial evidence that incorporating brief, weekly, and remotely completed MOBC questionnaires into community SUD treatment may be a viable approach for facilitating MOBC-informed care. Such questionnaires can potentially support measurement-based care by providing meaningful information about within-patient changes in clinical domains that are often directly targeted in SUD treatments and predict long-term substance use outcomes.

Mechanisms of Behavior Change in Substance Use Disorder With and Without Formal Treatment

This article provides a narrative review of studies that examined mechanisms of behavior change in substance use disorder. Several mechanisms have some support, including self-efficacy, craving, protective behavioral strategies, and increasing substance-free rewards, whereas others have minimal support (e.g., motivation, identity). The review provides recommendations for expanding the research agenda for studying mechanisms of change, including designs to manipulate putative change mechanisms, measurement approaches that expand the temporal units of analysis during change efforts, more studies of change outside of treatment, and analytic approaches that move beyond mediation tests. The dominant causal inference approach that focuses on treatment and individuals as change agents could be expanded to include a molar behavioral approach that focuses on patterns of behavior in temporally extended environmental contexts. Molar behavioral approaches may advance understanding of how recovery from substance use disorder is influenced by broader contextual features, community-level variables, and social determinants of health. Expected final online publication date for the Annual Review of Clinical Psychology, Volume 18 is May 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Combined pharmacotherapy and evidence-based psychosocial Cannabis treatment for youth and selection of cannabis-using friends

BACKGROUND

Theoretical models of behavior change argue that youth should decrease their time with cannabis-using friends and increase their time with non-using friends during treatment. Informed by behavior-change models of recovery and socialization and selection peer-influence models, the current study examined whether combining evidence-based psychosocial treatment with adjunctive pharmacotherapy helps youth decrease their affiliations with cannabis-using friends and increase their affiliations with non-using friends during cannabis misuse treatment.

METHODS

Youth ages 15-24 years (51 % male), participated in a double-blind randomized clinical trial that tested the effects of motivational enhancement and cognitive behavioral therapy (MET-CBT) plus topiramate (N = 39) or placebo (N = 26) on cannabis craving and use. Ecological momentary assessment data, collected via smartphones throughout the six-week intervention, assessed youths' time with cannabis-using and non-using friends, cannabis use, and craving in daily life. Multiple group multilevel structural equation modeling tested study hypotheses.

RESULTS

Across the topiramate (48 % completion rate) and placebo (77 % completion rate) conditions, greater time spent with cannabis-using friends promoted greater next day cannabis use and craving (socialization effect). In turn, cannabis craving, but not use, promoted continued selection of cannabis-using friends. This indirect effect was only supported in the placebo condition due to the selection piece of this cycle not being significant for youth who received topiramate. Neither cannabis craving nor use were associated with time with non-using friends the next day.

CONCLUSIONS

MET-CBT and adjunctive topiramate pharmacotherapy interrupted youth selection processes. This finding suggests that changing peer affiliations could be one mechanism by which treatments can work.

Patterns of transitions between relapse to and remission from heavy drinking over the first year after outpatient alcohol treatment and their relation to long-term outcomes

OBJECTIVES

Studying clinical course after alcohol use disorder (AUD) treatment is central to understanding longer-term recovery. This study's two main objectives were to (a) replicate a recent study that identified heterogeneity in patterns of remission from/relapse to heavy drinking during the first year after outpatient treatment in an independent data set and (b) extend these recent findings by testing associations between patterns of remission/relapse and long-term alcohol-related and functioning outcomes.

METHOD

Latent profile analyses were conducted using data from Project MATCH (N = 952; M age = 38.9; 72.3% female) and COMBINE (N = 1,383; M age = 44.4; 69.1% male). Transitions between heavy and nonheavy drinking within consecutive 2-week periods over a 1-year posttreatment period were characterized for each participant. From this, latent profiles were identified based on participants' initial 2-week heavy drinking status, the number of observed transitions between 2-week periods of relapse and remission, and the average duration of observed remission/relapse episodes.

RESULTS

In both MATCH and COMBINE, we identified six profiles: (a) "continuous remission," 25.3% of COMBINE sample/25.3% of MATCH sample; (b) "transition to remission," 19.6%/9.6%; (c) "few long transitions," 15.9%/33.7%; (d) "many short transitions," 13.2%/13.6%; (e) "transition to relapse," 7.2%/7.1%; and (f) "continuous relapse," 18.8%/10.5%. Profiles 1 and 2 had the best long-term outcomes, Profiles 5 and 6 had the worst, and Profiles 3 and 4 fell between these groups.

CONCLUSIONS

That many individuals can remit from heavy drinking following one or more relapses to heavy drinking may be of direct interest to individuals in recovery from AUD. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Changes in Hypothesized Mechanisms of Change Before and After Initiating Abstinence in Cognitive-Behavioral Therapy for Women With Alcohol Use Disorder

Abstinence self-efficacy, coping skills, and therapeutic alliance are hypothesized mechanisms of behavioral change (MOBCs) in cognitive-behavioral therapy (CBT) for alcohol use disorder (AUD). However, little is known about when these hypothesized MOBCs change during treatment or in relation to the initiation of abstinence from alcohol, which the current study investigated. Patient-reported abstinence self-efficacy, drinking-related coping skills, and therapeutic alliance were measured at every session throughout a 12-session clinical trial that previously showed equivalent drinking reductions in female-specific individual- and group-based CBT for AUD. Participants (N = 121 women) were classified into subgroups based on whether and when they first initiated 14 days of continuous abstinence from alcohol during treatment. Interrupted time-series analyses evaluated the magnitude and timing of change in MOBC variables in relation to the initiation of abstinence. All three MOBC measures showed gradual improvements throughout treatment (within-subjects d = 0.03 to 0.09 change per week). Participants who initiated abstinence during treatment experienced additional sudden improvements in abstinence self-efficacy (d = 0.47) and coping skills (d = 0.27), but not therapeutic alliance (d = -0.02), the same week they initiated abstinence. Participants who were already abstinent when treatment started maintained higher abstinence self-efficacy and coping skills, but not therapeutic alliance, throughout treatment compared to participants who never initiated abstinence. Initiating abstinence may help facilitate improvements in abstinence self-efficacy and drinking-related coping skills. Clinicians may help patients anticipate when and how much these variables are expected to improve during treatment and encourage initiation of abstinence to potentially help facilitate improvements in abstinence self-efficacy and coping skills.

Alexithymia and Alcohol Dependence: The Roles of Negative Mood and Alcohol Craving

Background: Alexithymia is a personality trait associated with emotion regulation difficulties. Up to 67% of alcohol-dependent patients in treatment have alexithymia. Objectives: The objective of this study was to investigate the direct and indirect effects of alexithymia, negative mood (stress, anxiety, and depression) and alcohol craving on alcohol dependence severity. Methods: Three hundred and fifty-five outpatients (mean age = 38.70, SD = 11.00, 244 males, range 18-71 years) undergoing Cognitive-Behavioral Therapy for alcohol dependence completed the Toronto Alexithymia Scale (TAS-20), Depression Anxiety Stress Scales (DASS-21), Obsessive Compulsive Drinking Scale (OCDS), and Alcohol Use Disorders Identification Test (AUDIT) prior to the first treatment session. Results: Alexithymia had an indirect effect on alcohol dependence severity, via both negative mood and alcohol craving (b = 0.03, seb = 0.008, 95% CI: 0.02-0.05). An indirect effect of negative mood on alcohol dependence via alcohol craving was also observed (b = 0.12, seb = 0.03, 95% CI: 0.07-0.16). Conclusions/importance: Alexithymia worked through negative mood and alcohol craving leading to increased alcohol dependence severity, indicating that craving had an indirect effect on the relationship between alexithymia and alcohol dependence severity. Targeting alcohol craving and negative mood for alcohol-dependent patients with alexithymia seems warranted.

Sensitivity Analysis of the No-Omitted Confounder Assumption in Latent Growth Curve Mediation Models

Latent growth curve mediation models are increasingly used to assess mechanisms of behavior change. For latent growth mediation model, like any another mediation model, even with random treatment assignment, a critical but untestable assumption for valid and unbiased estimates of the indirect effects is that there should be no omitted variable that confounds indirect effects. One way to address this untestable assumption is to conduct sensitivity analysis to assess whether the inference about an indirect effect would change under varying degrees of confounding bias. We developed a sensitivity analysis technique for a latent growth curve mediation model. We compute the biasing effect of confounding on point and confidence interval estimates of the indirect effects in a structural equation modeling framework. We illustrate sensitivity plots to visualize the effects of confounding on each indirect effect and present an empirical example to illustrate the application of the sensitivity analysis.