Date	Event	Description
31 August 2006	New search has been performed	This update reflects data from one new study (Freeman 2005). Fifteen studies are now included in the review. The conclusions of the review were not significantly altered.
22 August 2005	New citation required and conclusions have changed	This update reflects data from four new studies (Epstein 2004; Hockemeyer 2002; Lehrer 2004; Ross 2005). Two studies previously included have now been excluded from this review as they were of crossover design (Loew 2001; Mussell 198) and as such are prone to carryover effects. Fourteen studies are now included in the review. Some pooled effects were analysed with new data. 'As needed' medication usage was lower with relaxation therapy compared with control (OR 4.47, CI 1.22 to 16.44). Quality of life, measured using the Asthma Quality of Life Questionnaire showed a positive effect following CBT (WMD 0.71, CI 0.23 to 1.19). Peak Expiratory Flow outcome data indicated a significant difference in favour of bio‐feedback therapy (SMD 0.66, CI 0.09 to 1.23).There was no significant difference in favour of relaxation therapy for FEV1 (SMD ‐0.01, CI ‐0.41 to 0.40). Study quality remains poor, casting some question over the validity of the findings in the review. Improved reporting of study conduct would help to determine the robustness of the randomisation procedures.