A systematic review of randomized controlled trials.
The treatment of chronic low back pain is not primarily focused on removing an underlying organic disease but at the reduction of disability through the modification of environmental contingencies and cognitive processes. Behavioral interventions are commonly used in the treatment of chronic (disabling) low back pain.
To determine whether behavioral therapy is more effective than reference treatments for chronic nonspecific low back pain and which type of behavioral treatment is most effective.
The authors searched the Medline and PsychLit databases and the Cochrane Controlled Trials Register up to April 1999, and Embase up to September 1999. Also screened were references of identified randomized trials and relevant systematic reviews. Methodologic quality assessment and data extraction were performed independently by two reviewers. The magnitude of effect was assessed by computing a pooled effect size for each domain (i.e., behavioral outcomes, overall improvement, back pain–specific and generic functional status, return to work, and pain intensity) using the random effects model.
Only six (25%) studies were high quality. There is strong evidence (level 1) that behavioral treatment has a moderate positive effect on pain intensity (pooled effect size 0.62; 95% confidence interval [CI] 0.25, 0.98), and small positive effects on generic functional status (pooled effect size 0.35; 95% CI: 0.04, 0.74) and behavioral outcomes (pooled effect size 0.40; 95% CI: 0.10, 0.70) of patients with chronic low back pain when comparedwith waiting-list controls or no treatment. There is moderate evidence (level 2) that a addition of behavioral component to a usual treatment program for chronic low backpain has no positive short-term effect on generic functional status (pooled effect size 0.31; 95% CI: 0.01, 0.64), pain intensity (pooled effect size 0.03; 95% CI: 0.30,0.36), and behavioral outcomes (pooled effect size 0.19; 95% CI: 0.08, 0.45).
Behavioral treatment seems to be an effective treatment for patients with chronic low back pain,but it is still unknown what type of patients benefit most from what type of behavioral treatment.
From the *Institute for Research in Extramural Medicine, Free University, Amsterdam, The Netherlands; Departments of †Epidemiology and ‡Clinical & Experimental Psychology, Maastricht University, Maastricht, The Netherlands; Department of Occupational Medicine, Örebro Medical Centre Hospital, Örebro, Sweden; ÷Academic Unit of Psychiatry & Behavioral Science, University of Leeds, Leeds, United Kingdom; and the ¶Department of General Practice and Dutch Cochrane Centre, Academic Medical Centre, Amsterdam, The Netherlands.
Acknowledgment date: June 14, 2000.
Acceptance date: June 14, 2000.
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Maurits van Tulder, PhD
Institute for Research in Extramural Medicine
van der Boechorststraat 7
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Potential conflict of interest: Steven Linton is the first author of one of the trials and Johan Vlaeyen coauthor of one of the trials included in this review. Methodological quality assessment and data extraction of these trials was done by two other reviewers (Raymond Ostelo and Maurits van Tulder).