Date	Event	Description
12 May 2010	New citation required and conclusions have changed	Reviewer comments incorporated into the manuscript. As a result, two RCTs from the original review were excluded (Bru 1994; Lindström 1992) as they did not meet the inclusion criteria and were not included in the analyses. Removing these RCTs and responding to these amendments did not change the conclusions of the updated review.
1 March 2009	New search has been performed	We included 11 new randomised controlled trials in this update. The risk of bias and clinical relevance of all included RCTs was assessed using the updated criterion of the Cochrane Back Review Group. The GRADE approach was incorporated and used to judge the quality of the evidence for a particular comparison.
30 October 2004	New citation required but conclusions have not changed	Neither of the changes listed below changed the conclusion of the original review dramatically. However, by disaggregating the different treatment effects, and analysing treatment effects of the various types of treatment separately, we tried to assess which type of behavioural treatment was most effective, which components of behavioural treatment are necessary, and which are superfluous.
18 October 2004	Feedback has been incorporated	See feedback section Feedback received: 15/06/01 Response to feedback: 18/01/04
1 October 2003	New search has been performed	We included one additional randomised controlled study in this update. Another new element is that the original comparison of "all types of Cognitive Behavioural Treatment versus Waiting List Control, No treatment or Placebo" is now divided into various types of treatments (operant, cognitive and behavioural).