Timothy R. Apodaca

Mechanisms of change in motivational interviewing: a review and preliminary evaluation of the evidence.

AIMS Motivational interviewing (MI) is an efficacious treatment for substance use disorders. However, little is known about how MI exerts its therapeutic effects. This review is a first attempt to summarize and evaluate the evidence for purported within-session mechanisms of change. The primary question of interest was: which MI constructs and variables appear to be the most promising candidates for mechanisms of change? METHODS Literature searches were conducted to identify studies delivering MI in an individual format for the treatment of substance use disorders. Our search identified a total of 152 studies for review; 19 studies met inclusion criteria by providing data on at least one link in the causal chain model under examination. Effect size estimates were calculated for every possible step in the causal model where sufficient data were provided by study authors. RESULTS Four constructs of therapist behavior were evaluated: MI-Spirit, MI-Consistent behaviors, MI-Inconsistent behaviors and therapist use of specific techniques. Five constructs of client behavior were evaluated: change talk/intention, readiness to change, involvement/engagement, resistance and the clients experience of discrepancy. The absence of experimental and full mediation studies of mechanisms of change was notable. Effect sizes were generally mixed. CONCLUSIONS The most consistent evidence was found for three constructs: client change talk/intention (related to better outcomes); client experience of discrepancy (related to better outcomes); and therapist MI-Inconsistent behavior (related to worse outcomes). Regarding therapist use of specific techniques, use of a decisional balance exercise showed the strongest association to better outcomes.

The technical hypothesis of motivational interviewing: a meta-analysis of MI's key causal model.

OBJECTIVE The technical hypothesis of motivational interviewing (MI) posits that therapist-implemented MI skills are related to client speech regarding behavior change and that client speech predicts client outcome. The current meta-analysis is the first aggregate test of this proposed causal model. METHOD A systematic literature review, using stringent inclusion criteria, identified 16 reports describing 12 primary studies. We used review methods to calculate the inverse-variance-weighted pooled correlation coefficient for the therapist-to-client and the client-to-outcome paths across multiple targeted behaviors (i.e., alcohol or illicit drug use, other addictive behaviors). RESULTS Therapist MI-consistent skills were correlated with more client language in favor of behavior change (i.e., change talk; r = .26, p < .0001), but not less client language against behavior change (i.e., sustain talk; r = .10, p = .09). MI-inconsistent skills were associated with less change talk (r = -.17, p = .001) as well as more sustain talk (r = .07, p = .009). Among these studies, client change talk was not associated with follow-up outcome (r = .06, p = .41), but sustain talk was associated with worse outcome (r = -.24, p = .001). In addition, studies examining composite client language (e.g., an average of negative and positive statements) showed an overall positive relationship with client behavior change (r = .12, p = .006; k = 6). CONCLUSIONS This meta-analysis provides an initial test and partial support for a key causal model of MI efficacy. Recommendations for MI practitioners, clinical supervisors, and process researchers are provided.

Moderators and mediators of two brief interventions for alcohol in the emergency department.

OBJECTIVE To evaluate moderators and mediators of brief alcohol interventions conducted in the emergency department. METHODS Patients (18-24 years; n = 172) in an emergency department received a motivational interview with personalized feedback (MI) or feedback only (FO), with 1- and 3-month booster sessions and 6- and 12-month follow-ups. Gender, alcohol status/severity group [ALC+ only, Alcohol Use Disorders Identification Test (AUDIT+) only, ALC+/AUDIT+], attribution of alcohol in the medical event, aversiveness of the event, perceived seriousness of the event and baseline readiness to change alcohol use were evaluated as moderators of intervention efficacy. Readiness to change also was evaluated as a mediator of intervention efficacy, as were perceived risks/benefits of alcohol use, self-efficacy and alcohol treatment seeking. RESULTS Alcohol status, attribution and readiness moderated intervention effects such that patients who had not been drinking prior to their medical event, those who had low or medium attribution for alcohol in the event and those who had low or medium readiness to change showed lower alcohol use 12 months after receiving MI compared to FO. In the AUDIT+ only group those who received MI showed lower rates of alcohol-related injury at follow-up than those who received FO. Patients who had been drinking prior to their precipitating event did not show different outcomes in the two interventions, regardless of AUDIT status. Gender did not moderate intervention efficacy and no significant mediation was found. CONCLUSIONS Findings may help practitioners target patients for whom brief interventions will be most effective. More research is needed to understand how brief interventions transmit their effects.

The route to change: within-session predictors of change plan completion in a motivational interview.

This study is the first to examine within-session therapist and client language/process predictors of a clients decision to complete a written Change Plan in an alcohol-focused motivational interview (MI). Data were from an ongoing hospital-based clinical trial (N = 291). Trained raters coded audiorecorded MI sessions using the Motivational Interviewing Skill Code. Logistic regression analyses found that therapist MI-consistent behaviors (b = .023, p < .001) and client change talk (b = .063, p < .001) were positive predictors, and client counter change talk (b = -.093, p < .001) was a negative predictor of the decision to complete a Change Plan regarding alcohol use. Mean comparisons showed that compared to noncompletion, Change Plan completion did not result in significantly greater changes in client motivational readiness. Completion of a Change Plan is a proximal outcome in MI that is associated with client intention to change (change talk) and may predict follow-up alcohol outcomes. Analyses of such theory-driven proximal client mechanisms provide a more complete model of MI process and may inform MI providers of necessary treatment ingredients.

In-session processes of brief motivational interventions in two trials with mandated college students

OBJECTIVE Each year, thousands of college students receive mandated intervention as a sanction for alcohol use or alcohol-related behavior. For these mandated students, brief motivational interventions (BMIs) are currently the most efficacious individual intervention. However, little is known about how the technical (therapist behaviors) and relational (e.g., global ratings of therapist empathy) components of BMIs influence client language as well as subsequent change in alcohol use and consequences. METHOD This study used the Motivational Interviewing Skills Code (MISC 2.0; Miller, Moyers, Ernst, & Amrhein, 2003) to code BMI sessions from 2 randomized clinical trials that facilitated significant reductions in alcohol use (Study 1, n = 91) and alcohol-related consequences (Study 2, n = 158) in mandated students. RESULTS There were significant relationships among therapist behaviors, global scores, and client language both for and against change, yet there were no links between in-session client language and subsequent changes in alcohol use or problems. In contrast, relational aspects of motivational interviewing (MI; global ratings of therapist MI Spirit and client self-exploration) were most predictive of postsession alcohol use. Mediation models incorporating both technical and relational components revealed that higher levels of client self-exploration mediated the relationship between higher therapist ratings of MI Spirit and reduced drinking at follow-up. CONCLUSIONS Findings highlight the importance of considering how both technical and relational components of MI may influence alcohol use in mandated college students and also suggest more exact analyses to better understand this complex relationship.

Effect of a significant other on client change talk in motivational interviewing.

OBJECTIVE To examine significant-other (SO) and therapist behaviors as predictors of client change language within motivational interviewing (MI) sessions. METHOD Participants from an emergency department received a single session of MI that included SO participation (N = 157). Sessions were coded using therapy process coding systems. Sessions were subdivided into 10 equal deciles to facilitate sequential analyses. Multilevel modeling was used to examine the relationships among the following variables: therapist MI-consistent and MI-inconsistent behaviors; client change talk and sustain talk; and SO Support Change and SO Against Change. RESULTS Therapist MI-consistent and MI-inconsistent behaviors failed to predict either client change talk or sustain talk at the decile level. Global measures of therapist MI spirit and acceptance were associated with lower levels of client sustain talk (p = .002 and p < .001, respectively). Higher levels of SO Support Change were more likely to be followed by higher levels of client change talk (p < .001) and lower levels of client sustain talk (p < .001). SOs who engaged in behaviors that discouraged the patients drinking in the 6 months prior to the intervention had higher levels of SO Support Change language (p = .02). When analyzed at the aggregate level, therapist behavior was significantly associated with client change talk, but effect sizes were quite modest. CONCLUSIONS Within-session SO behavior impacts client verbalizations regarding changes in alcohol use. Results raise questions about the role of therapist behavior when an SO is present.

Sustain Talk Predicts Poorer Outcomes Among Mandated College Student Drinkers Receiving a Brief Motivational Intervention

Within-session client language that represents a movement toward behavior change (change talk) has been linked to better treatment outcomes in the literature on motivational interviewing (MI). There has been somewhat less study of the impact of client language against change (sustain talk) on outcomes following an MI session. This study examined the role of both client change talk and sustain talk, as well as therapist language, occurring during a brief motivational intervention (BMI) session with college students who had violated college alcohol policy (N = 92). Audiotapes of these sessions were coded using a therapy process coding system. A series of hierarchical regressions were used to examine the relationships among therapist MI-consistent and MI-inconsistent language, client change talk and sustain talk, as well as global measures of relational variables, and drinking outcomes. Contrary to prior research, sustain talk, but not change talk, predicted poorer alcohol use outcomes following the BMI at 3- and 12-month follow-up assessments. Higher levels of client self-exploration during the session also predicted improved drinking outcomes. Therapist measures of MI-consistent and MI-inconsistent language, and global measures of therapist acceptance and MI spirit were unrelated to client drinking outcomes. Results suggest that client sustain talk and self-exploration during the session play an important role in determining drinking outcomes among mandated college students receiving a BMI addressing alcohol use.

Which Individual Therapist Behaviors Elicit Client Change Talk and Sustain Talk in Motivational Interviewing

OBJECTIVE To identify individual therapist behaviors which elicit client change talk or sustain talk in motivational interviewing sessions. METHOD Motivational interviewing sessions from a single-session alcohol intervention delivered to college students were audio-taped, transcribed, and coded using the Motivational Interviewing Skill Code (MISC), a therapy process coding system. Participants included 92 college students and eight therapists who provided their treatment. The MISC was used to code 17 therapist behaviors related to the use of motivational interviewing, and client language reflecting movement toward behavior change (change talk), away from behavior change (sustain talk), or unrelated to the target behavior (follow/neutral). RESULTS Client change talk was significantly more likely to immediately follow individual therapist behaviors [affirm (p=.013), open question (p<.001), simple reflection (p<.001), and complex reflection (p<.001)], but significantly less likely to immediately follow others (giving information (p<.001) and closed question (p<.001)]. Sustain talk was significantly more likely to follow therapist use of open questions (p<.001), simple reflections (p<.001), and complex reflections (p<.001), and significantly less likely to occur following therapist use of therapist affirm (p=.012), giving information (p<.001), and closed questions (p<.001). CONCLUSIONS Certain individual therapist behaviors within motivational interviewing can either elicit both client change talk and sustain talk or suppress both types of client language. Affirm was the only therapist behavior that both increased change talk and also reduced sustain talk.

Motivational Interviewing to Reduce Substance Use in Adolescents with Psychiatric Comorbidity.

Substance use among adolescents with one or more psychiatric disorders is a significant public health concern. In this study, 151 psychiatrically hospitalized adolescents, ages 13-17 with comorbid psychiatric and substance use disorders, were randomized to a two-session Motivational Interviewing intervention to reduce substance use plus treatment as usual (MI) vs. treatment as usual only (TAU). Results indicated that the MI group had a longer latency to first use of any substance following hospital discharge relative to TAU (36 days versus 11 days). Adolescents who received MI also reported less total use of substances and less use of marijuana during the first 6 months post-discharge, although this effect was not significant across 12 months. Finally, MI was associated with a significant reduction in rule-breaking behaviors at 6-month follow-up. Future directions are discussed, including means of extending effects beyond 6 months and dissemination of the intervention to community-based settings.

A Pilot Study of Bibliotherapy to Reduce Alcohol Problems among Patients in a Hospital Trauma Center

&NA; Because alcohol use plays a major role in many injuries that require hospital care, there is increasing interest in developing interventions to address alcohol problems among emergency department and trauma center patients. The aim of the current study was to extend past research on brief interventions by investigating the use of a self‐help manual to treat problem drinkers in a hospital trauma center. Forty injured patients who were either intoxicated at the time of injury or screened positive for harmful drinking were randomly assigned to receive either a brief assessment and a self‐help booklet with no more than 5 minutes clinician contact (bibliotherapy) or brief assessment only. Follow‐up data obtained five months after hospital discharge indicated that patients in both conditions made significant reductions in drinking and associated negative consequences. There was a trend toward further treatment‐seeking among those in the bibliotherapy condition (40% versus 13%). Results suggest that the provision of self‐help materials to treat problem drinkers identified in a hospital trauma setting may not bring about behavior change beyond that observed following hospitalization and an assessment of drinking. Caution in the interpretation of results is warranted due to the small sample size.