Background Many pain patients appreciate biofeedback interventions because of the integration of psychological and physiological aspects. Therefore we wanted to investigate in a sample of chronic back pain patients whether biofeedback ingredients lead to improved outcome of psychological interventions. Method One hundred and twenty-eight chronic back pain patients were randomly assigned to cognitive-behavioural therapy (CBT), cognitive-behavioural therapy including biofeedback tools (CBT-B) or waitlist control (WLC). The sample was recruited from a highly disabled group including many patients with low education status and former back surgeries. Measures on pain, physical functioning, emotional functioning, coping strategies and health care utilisation were taken at pretreatment, posttreatment and 6 months of follow-up. Results The results indicated significant improvements on most outcome measures for CBT-B and CBT in comparison to WLC. CBT-B and CBT were equally effective (e.g. ITT effect sizes for pain intensity: CBT-B, 0.66 (95% CI 0.39-0.95); CBT, 0.60 (95% CI 0.33-0.87)). Conclusion In conclusion, biofeedback ingredients did not lead to improved outcome of a psychological intervention. Cognitive-behavioural treatment as a "package" of respondent, operant and cognitive interventions was effective for ameliorating pain-related symptoms for chronic back pain patients treated in an outpatient setting. The high treatment acceptability associated with biofeedback ingredients can also be achieved with pure psychological interventions.

It is concluded that cognitive-behavioral treatment of chronic pain should be adapted for less psychologically distressed patients to avoid treatment dropout.

The authors concluded that reducing pain-related depression could be a central therapeutic mechanism in cognitive-behavioral treatment of chronic back pain.

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Lower skill levels are associated with higher comorbidity and higher level of psychopathology of patients. There is evidence for specific skill profiles within different clinical subsamples. The improvement of skills that can impact recovery from mental disorders is especially relevant for patients with multiple diagnoses. It makes sense to assess the different skills independently and consider them separately when planning interventions.