Blog

The Psychotherapy Practice Research Network (PPRNet) blog began in 2013 in response to psychotherapy clinicians, researchers, and educators who expressed interest in receiving regular information about current practice-oriented psychotherapy research. It offers a monthly summary of two or three published psychotherapy research articles. Each summary is authored by Dr. Tasca and highlights practice implications of selected articles. Past blogs are available in the archives. This content is only available in English.

June 2016

Is Therapist Effectiveness a Stable Characteristic?

Kraus, D. R., Bentley, J. H., Alexander, P. C., Boswell, J. F., Constantino, M. J., Baxter, E. E., & Castonguay, L. G. (2016). Predicting therapist effectiveness from their own practice-based evidence. Journal of Consulting and Clinical Psychology, 84(6), 473-483.

There is lots of evidence that there are differences between therapists in their patients’ outcomes. Some studies estimate that 5% to 7% of patient outcomes can be attributed to differences between therapists’ abilities and style of delivering treatment. But most of these studies measured outcomes only once, and so they could not estimate if therapist effects are stable across time. Further, many of these studies used only a global measure of patient distress as an outcome and did not measure domain-specific outcomes (e.g., depression, anxiety, mania, alcohol dependence, etc.). In this study by Krauss and colleagues, 59 therapists who treated 3,540 patients were included. Therapists had on average 10 years of experience and were from a variety of professions (psychologists, psychiatrists, social workers, counsellors etc.). The settings included mental health clinics, independent practice, hospitals, and others. The authors went to some effort to control for case-mix variables such as client problem difficulty, length of treatment, caseload size, and other variables. Client outcomes were measured for 12 different domains ranging from depression to sexual dysfunction to substance abuse. First, outcomes were assessed for 30 patients of each therapist, and then these were compared to outcomes of the same therapist’s next 30 patients. Therapists were classified as “exceptional”, “average”, or “below average” based on their patients’ outcomes. Fifty-seven percent of therapists who were rated as exceptional with the first 30 patients were likely to remain exceptional or above average with the next 30 patients. In other words, effective therapists tended to remain effective over time. Therapists had better patient outcomes when it came to depression, suicidality, and substance abuse, but therapists tended not to have as good outcomes when it came to mania, and sexual functioning.

Practice Implications

Effective therapists tend to remain effective over time for particular client problem areas. However, therapists are seldom effective for more than 4 or 5 client presenting problems, and less than 10 % of therapists are effective with all client problem areas. Therefore patients with differing problems are likely to achieve better or worse outcomes depending on the particular therapist and his or her strengths. Therapists can regularly assess patient outcomes and use that information to help with continuing education to improve their practice for a particular problem area.
Are Therapists Uniformly Effective Across Patient Outcomes?

Nissen-Lie, H. A., Goldberg, S. B., Hoyt, W. T., Falkenström, F., Holmqvist, R., Nielsen, S. L., & Wampold, B. E. (2016). Are therapists uniformly effective across patient outcome domains? A study of therapist effectiveness in two different treatment contexts. Journal of Counseling Psychology. Advance online publication.

What characterizes more or less effective therapists? Are some therapists more effective for certain types of client mental health problems? In this study by Nissen-Lie and colleagues the authors look at whether therapists are skilled across patient problem domains. They conducted two studies with over 6000 patients and almost 200 therapists. Patients were assessed with common outcome measures of mental health domains that included: social functioning, work functioning, relationship functioning and symptom distress. Therapists included psychologists and social work professionals (70%) and trainees (30%) who saw at least 10 patients each. Theoretical orientations ranged from CBT, psychodynamic, and supportive psychotherapy. Patients were symptomatic at the start of therapy and primarily had problems with anxiety and depression. Patient symptoms on average improved so that psychotherapy had a moderate to large effect. Therapists did not differ in caseload mix regarding client severity. The authors reported that the client mental health domains (i.e., symptom severity, work functioning, social functioning, and interpersonal functioning) were relatively distinct or unrelated areas (i.e., the domains were largely uncorrelated). The authors then calculated change scores for each client domain area and used these change scores in a multilevel factor analysis. They wanted to see if a therapist’s clients achieved greater change in one client domain versus in another client domain. The results showed that if clients of a therapist changed in one domain (e.g., depression) then that outcome was highly related to change in another domain (e.g., interpersonal functioning). In other words, if a therapist was effective (or ineffective) in reducing client symptoms, then that therapist was also likely effective (or ineffective) in reducing, work, social, and relationship problems.

Practice Implications

The results support the notion of therapist uniformity in terms of client outcome domains. In other words effective therapists tend to be effective with many types of client problems (but perhaps not all client problems – see my blog this month of the Kraus et al. (2016) study). The authors argue that effective therapists have three key qualities: flexibility in adapting treatments to clients, sensitivity to differences between clients, and responsiveness to clients’ reactions to therapeutic interventions. That is, effective therapists are willing and able to self correct when required.
Therapist Interpersonal Skills Account for Patient Outcomes

Schottke, H., Fluckiger, C., Goldberg, S.B., Eversmann, & Lange, J. (2016). Predicting psychotherapy outcome based on therapist interpersonal skills: A five-year longitudinal study of a therapist assessment protocol. Psychotherapy Research, DOI: 0.1080/10503307.2015.1125546

Therapist effects, or differences between therapists, account for an important amount of patient outcomes (i.e., 5% to 7%). Two therapist characteristics most consistently proposed as predictors of patient outcomes are: therapist competence/adherence to a treatment manual, and therapist interpersonal skills. A recent meta analysis found that therapist adherence or competence were not significantly related to patient outcomes. However, there has been very little research on therapists’ interpersonal capacities. These capacities might include factors like: empathy, warmth, ability to respond well to patient hostility, sensitivity to interpersonal process in therapy, and ability to address alliance ruptures. In this paper, Schottke and colleagues (2016) conducted a five year study with 41 therapists and 264 patients in which they assessed the impact of therapist interpersonal skills on patient outcomes. The therapists were all post-graduate trainees and who practiced a manual oriented cognitive behavioral therapy (CBT) or psychodynamic therapy (PDT). The patients were adults mainly treated for depression, and many had co-morbid problems. What was unique about the study is that the therapist interpersonal skill was rated before they received formal training, and the rating were done by trained reliable judges. The judges rated the therapist trainees on interpersonal skills including: clear and positive communication, empathy, warmth, managing criticism, and willingness to cooperate. Patients were assessed pre- and post-treatment on general symptom outcomes. Higher therapist interpersonal skills were reliably associated with better patient outcomes, even after controlling for symptoms severity and number of comorbid diagnoses. In this study, therapist interpersonal capacities measured before receiving formal training and supervision was a significant predictor of patient outcomes after training was initiated.

Practice Implications

The findings of this study indicate that therapists’ talent should in part be characterized by interpersonal competencies that include clear communication, empathy, respectful management of criticism, warmth, and willingness to cooperate. It could be that therapist trainees with high interpersonal skills engage in an extensive degree of deliberate practice that may account for better patient outcomes.

April 2016

How Important are the Common Factors in Psychotherapy?

Wampold, B. E. (2015). How important are the common factors in psychotherapy? An update. World Psychiatry, 14, 270-277.

What is the evidence for the common factors in psychotherapy and how important are they to patient outcomes? In their landmark book, The Great Psychotherapy Debate, Wampold and Imel cover this ground is some detail, and I reviewed a number of the issues raised in their book in the PPRNet blog over the past year. This article by Wampold provides a condensed summary of the research evidence for the common factors in psychotherapy, including: therapeutic alliance, therapist empathy, client expectations, cultural adaptation of treatments, and therapist effects. Therapeutic alliance refers to therapist and client agreement on tasks and goals of therapy, and the bond between therapist and client. A meta-analysis of the therapeutic alliance included over 200 studies of 14,000 patients and found a medium effect of alliance on patient outcomes (d = .57) across a variety of disorders and therapeutic orientations. A number of studies are also concluding that the alliance consistently predicts good outcomes, but that early good outcomes do not consistently predict a subsequent higher alliance. Further, therapists and not patients were primarily responsible for the alliance-outcome relationship. Another common factor, empathy, is thought to be necessary for cooperation, goal sharing, and social interactions. A meta-analysis of therapist empathy that included 59 studies and over 3,500 patients found that the relationship between empathy and patient outcome was moderately large (d = .63). Patient expectations that they will receive benefit from a structured therapy that explains their symptoms can be quite powerful in increasing hope for relief. A meta-analysis of 46 studies found a small but statistically significant relationship (d = .24) between client expectations and outcome. Cultural adaptation of treatments refers to providing an explanation of the symptoms and treatment that are acceptable to the client in the context of their culture. A meta analysis of 21 studies found that cultural adaptation of evidence-based treatments by using an explanation congruent with the client’s culture was more effective than unadapted evidence-based treatments, and the effect was modest (d = .32). Finally, therapist effects, refers to some therapists consistently achieving better outcomes than other therapists regardless of the patients’ characteristics or treatments delivered. A meta analysis of 17 studies of therapist effects in naturalistic settings found a moderately large effect of therapist differences (d = .55).

Practice Implications

These common factors of psychotherapy appear to be more important to patient outcomes than therapist adherence to a specific protocol and therapist competence in delivering the protocol. As Wampold argues, therapist competence should be redefined as the therapist’s ability to form stronger alliances across a variety of patients. Effective therapists tend to have certain qualities, including: a higher level of facilitative interpersonal skills, a tendency to express more professional self doubt, and they engage in more time outside of therapy practicing various psychotherapy skills.

March 2016

Does Clinician Confidence Lead to Accurate Clinical Judgement?

Miller, D.J., Spengler, E.S., & Spengler, P.M. (2015). A meta-analysis of confidence and judgement accuracy in clinical decision making. Journal of Counseling Psychology, 62, 553-567.

People can make errors in judgements based on decision making rules that are biased. Clinicians also may be prone to making such errors. In their Nobel Prize winning work, Kahneman and Tversky outlined a number of heuristics (i.e., mental shortcuts) that lead to cognitive biases, which in turn affect accuracy of decisions. For example, when making a differential diagnosis clinicians may: rely too heavily on only one piece of information which may be the most available (e.g., “I vividly remember a patient with conversion disorder who had the same history”); or ignore that a particular event (e.g., conversion disorder) is very rare; or seek confirming rather than disconfirming evidence (e.g., the patient has PTSD symptoms that can explain some symptoms). Complicating these biases is the tendency for clinicians to be over-confident. For example, in one study the average psychotherapist rated their performance as better than 80% of their peers, and no therapist rated him or herself in the lower 50^th percentile among peers. In their meta analysis, Miller and colleagues reviewed 36 studies of the relationship between clinician confidence ratings and accuracy of decisions among 1,485 clinicians. The authors were particularly interested in the overconfidence bias, which occurs when individuals report higher confidence in their judgments than is warranted by their actual accuracy. For example, studies have assessed the impact of clinician confidence on clinical accuracy in: detecting random responding on a psychological test, diagnosing a brain disorder verified by medical test using neuropsychological test data, predicting future violence and recidivism in offenders, and patient progress in psychotherapy. Most studies find that clinicians are quite confident in their judgments. But, is this confidence warranted? Miller and colleagues’ meta analysis found a significant but small (r = .15) association between confidence and accuracy. This suggests that clinician confidence is only slightly indicative of decision-making accuracy. The effect was a little larger for more experienced clinicians (r = .25), indicating that more experience and training resulted in somewhat more consistency between a clinician’s confidence and their clinical accuracy. Further, higher confidence leads to poorer accuracy when clinicians have to make repeated decisions without feedback, when feedback is not written, and when an event is rare.

Practice Implications

Clinicians, like everyone else, are sometimes subject to making errors when they only look at confirming evidence, when they rely only on their own memory rather than objective data, and when they are over-confident. Accuracy can be increased when clinicians use decision-making aids that provide quality corrective feedback. Aids to help in decision making might include the use of: objective standardized test data, repeated measurements with feedback to assess patient progress in psychotherapy, and actively looking for disconfirming evidence before making a clinical judgement. As the authors conclude, confidence is not a good substitute for accuracy.
Psychotherapists Matter When Evaluating Treatment Outcomes

Owen, J., Drinane, J. M., Idigo, K. C., & Valentine, J. C. (2015). Psychotherapist effects in meta-analyses: How accurate are treatment effects? Psychotherapy, 52(3), 321-328.

One of the ongoing debates in the psychotherapy research literature has to do with the relative efficacy of psychotherapies. Is psychotherapy brand A (CBT, for example) more effective than psychotherapy brand B (psychodynamic therapy, for example)? The most common way to test this question is with randomized controlled trials (RCTs), in which clients are randomly assigned to treatment condition (brand A or B). This study design controls for systematic bias in the results that may be caused by differences between clients. But what about therapists? We know for example that therapist effects (i.e., differences between therapists) account for approximately 5% to 10% of client outcomes. Therapist effects are often larger than the effect of the empirically supported treatment that is being offered. Yet it is almost unheard of for therapists to be randomized to treatments, so therapist effects are not controlled in most psychotherapy trials. As a result the effects of the differences between therapists get statistically rolled into the treatment effects. As Owen and colleagues point out, the impact of not controlling for therapist effects is that some differences between treatments in an RCT will appear statistically significant when in fact they are not. One can control for the effect of therapist differences, thus providing a more accurate estimate of treatment effects, but this is rarely done in published RCTs. So, when these RCTs are summarized in a meta analysis, the meta analysis results are also affected by ignoring therapist effects. In their study, Owen colleagues did something very clever. They took data from 17 recent meta analyses of RCTs that found differences between two interventions. These included meta analyses of studies comparing: CBT vs alternative treatments, bona fide treatments vs non-bona fide treatments, culturally adapted treatments vs those that were not adapted, etc. There are many other meta analyses that show no differences between treatments, but the authors wanted to focus specifically on the 17 that did show differences. Owen and colleagues statistically estimated what would happen to the original study findings of significant differences between treatments if therapist effects on patient outcomes were controlled. They controlled for three different sizes of therapist effects that accounted for: 5% (small), 10% (medium), or 20% (large) of patient outcomes. Even small therapist effects (5%) reduced the number of significant differences between treatments from 100% to 80%. When psychotherapist effects were estimated to be medium (10% - which is the best estimate based on research), the number of significant differences between treatments dropped to 65%. For large therapist effects (20%), the number of significant treatment differences was only 35%.

Practice Implications

I have argued previously that the psychotherapist matters. Placing more time and effort in developing good reflective practice based on quality information and developing therapist skills like empathy, progress monitoring, and identifying and repairing alliance ruptures will result in better patient outcomes. As Owen and colleagues note, when reading an RCT that claims to find significant differences between psychotherapies, ask yourself if they took into account the effects of differences between therapists.

This month...

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June 2016

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April 2016

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March 2016

Practice Implications

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Psychotherapy Practice Research Network (PPRNet)