Date	Event	Description
21 May 2014	New search has been performed	Inclusion of 31 new RCTs since the previous version, this enabled performance of several meta‐analyses rather than narrative descriptions of results only. Updated methods included up‐to‐date risk of bias assessment and summary synthesis of quality of evidence using the GRADE system.
21 May 2014	New citation required and conclusions have changed	The broad conclusions are in agreement with the previous version in that MBR is effective compared to usual care and non‐MBR interventions for chronic LBP. This review provides quantification of the mean effect size and does not confirm the finding that more intensive interventions resulted in larger effects. It is unlikely that conducting further RCTs comparing MBR to usual care or physical treatments will change our estimate of the effect of these interventions.