Date	Event	Description
13 August 2008	New search has been performed	Literature search run in June 2008. Additional data for an included study obtained from study investigators.
1 June 2007	New search has been performed	Literature search re‐run. One new trial was identified but did not contribute data to the review (Hoekema 2006). One study published in full and previously available as a conference abstract contributed data to the comparison OA versus CPAP. This did not alter the conclusions of the review.
12 September 2005	New citation required and conclusions have changed	Three new trials met the inclusion criteria of the review (Barnes 2004; Blanco 2005; Lam 2003). The inclusion of these data had a small impact on the findings of the review. More evidence has come to light that CPAP is more effective at suppressing apnoea, although the impact on symptoms between the two treatments remains not significantly different. Some data now call in to question whether our previous observation that OAs were preferred to CPAP. It appears that this is not always so, and that there are several important psychological factors which could influence preference over a short‐term trial, including perceived benefit.